Merge tag 'tty-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
"Here are some small updates for tty/serial drivers for 6.18-rc1.

Not many changes overall, just the usual:

- abi cleanups and reworking of the tty functions by Jiri by adding
console lock guard logic

- 8250_platform driver updates

- qcom-geni driver updates

- other minor serial driver updates

- some more vt escape codes added

All of these have been in linux-next for a while with no reported
issues"

* tag 'tty-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (43 commits)
tty: serial: fix help message for SERIAL_CPM
serial: 8250: omap: Support wakeup pinctrl state on suspend
dt-bindings: serial: 8250_omap: Add wakeup pinctrl state
serial: max310x: improve interrupt handling
vt: move vc_saved_screen to within tty allocated judgment
Revert "m68k: make HPDCA and HPAPCI bools"
tty: remove redundant condition checks
tty/vt: Add missing return value for VT_RESIZE in vt_ioctl()
vt: remove redundant check on vc_mode in con_font_set()
serial: qcom-geni: Add DFS clock mode support to GENI UART driver
m68k: make HPDCA and HPAPCI bools
tty: n_gsm: Don't block input queue by waiting MSC
serial: qcom-geni: Fix off-by-one error in ida_alloc_range()
serdev: Drop dev_pm_domain_detach() call
serial: sc16is7xx: drop redundant conversion to bool
vt: add support for smput/rmput escape codes
serial: stm32: allow selecting console when the driver is module
serial: 8250_core: fix coding style issue
tty: serial: Modify the use of dev_err_probe()
s390/char/con3270: use tty_port_tty guard()
...

Documentation/devicetree/bindings/serial/8250_omap.yaml

···
   overrun-throttle-ms: true
   wakeup-source: true
 
+  pinctrl-0:
+    description: Default pinctrl state
+
+  pinctrl-1:
+    description: Wakeup pinctrl state
+
+  pinctrl-names:
+    description:
+      When present should contain at least "default" describing the default pin
+      states. The second state called "wakeup" describes the pins in their
+      wakeup configuration required to exit sleep states.
+    minItems: 1
+    items:
+      - const: default
+      - const: wakeup
+
 required:
   - compatible
   - reg

arch/mips/sgi-ip22/ip22-platform.c

···
 }
 
 device_initcall(sgi_ds1286_devinit);
+
+#define SGI_ZILOG_BASE	(HPC3_CHIP0_BASE + \
+			 offsetof(struct hpc3_regs, pbus_extregs[6]) + \
+			 offsetof(struct sgioc_regs, uart))
+
+static struct resource sgi_zilog_resources[] = {
+	{
+		.start	= SGI_ZILOG_BASE,
+		.end	= SGI_ZILOG_BASE + 15,
+		.flags	= IORESOURCE_MEM
+	},
+	{
+		.start	= SGI_SERIAL_IRQ,
+		.end	= SGI_SERIAL_IRQ,
+		.flags	= IORESOURCE_IRQ
+	}
+};
+
+static struct platform_device zilog_device = {
+	.name		= "ip22zilog",
+	.id		= 0,
+	.num_resources	= ARRAY_SIZE(sgi_zilog_resources),
+	.resource	= sgi_zilog_resources,
+};
+
+
+static int __init sgi_zilog_devinit(void)
+{
+	return platform_device_register(&zilog_device);
+}
+
+device_initcall(sgi_zilog_devinit);

drivers/s390/char/con3270.c

···
 	char **old_rcl_lines, **new_rcl_lines;
 	char *old_prompt, *new_prompt;
 	char *old_input, *new_input;
-	struct tty_struct *tty;
-	struct winsize ws;
 	size_t prompt_sz;
 	int new_allocated, old_allocated = tp->allocated_lines;
 
···
 	kfree(old_prompt);
 	tty3270_free_recall(old_rcl_lines);
 	tty3270_set_timer(tp, 1);
-	/* Informat tty layer about new size */
-	tty = tty_port_tty_get(&tp->port);
-	if (!tty)
-		return;
-	ws.ws_row = tty3270_tty_rows(tp);
-	ws.ws_col = tp->view.cols;
-	tty_do_resize(tty, &ws);
-	tty_kref_put(tty);
+	/* Inform the tty layer about new size */
+	scoped_guard(tty_port_tty, &tp->port) {
+		struct winsize ws = {
+			.ws_row = tty3270_tty_rows(tp),
+			.ws_col = tp->view.cols,
+		};
+		tty_do_resize(scoped_tty(), &ws);
+	}
 	return;
 out_screen:
 	tty3270_free_screen(screen, new_rows);

drivers/tty/hvc/hvc_console.c

···
 					hvc_console_flush(cons_ops[index],
 						      vtermnos[index]);
 				}
-			} else if (r > 0) {
+			} else {
 				i -= r;
 				if (i > 0)
 					memmove(c, c+r, i);

drivers/tty/mxser.c

···
 
 static void mxser_start_tx(struct mxser_port *info)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&info->slock, flags);
+	guard(spinlock_irqsave)(&info->slock);
 	__mxser_start_tx(info);
-	spin_unlock_irqrestore(&info->slock, flags);
 }
 
 static void __mxser_stop_tx(struct mxser_port *info)
···
 static void mxser_dtr_rts(struct tty_port *port, bool active)
 {
 	struct mxser_port *mp = container_of(port, struct mxser_port, port);
-	unsigned long flags;
 	u8 mcr;
 
-	spin_lock_irqsave(&mp->slock, flags);
+	guard(spinlock_irqsave)(&mp->slock);
 	mcr = inb(mp->ioaddr + UART_MCR);
 	if (active)
 		mcr |= UART_MCR_DTR | UART_MCR_RTS;
 	else
 		mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
 	outb(mcr, mp->ioaddr + UART_MCR);
-	spin_unlock_irqrestore(&mp->slock, flags);
 }
 
 static int mxser_set_baud(struct tty_struct *tty, speed_t newspd)
···
 static void mxser_shutdown_port(struct tty_port *port)
 {
 	struct mxser_port *info = container_of(port, struct mxser_port, port);
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock) {
+		mxser_stop_rx(info);
 
-	mxser_stop_rx(info);
+		/*
+		 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+		 * here so the queue might never be waken up
+		 */
+		wake_up_interruptible(&info->port.delta_msr_wait);
 
-	/*
-	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
-	 * here so the queue might never be waken up
-	 */
-	wake_up_interruptible(&info->port.delta_msr_wait);
+		info->IER = 0;
+		outb(0x00, info->ioaddr + UART_IER);
 
-	info->IER = 0;
-	outb(0x00, info->ioaddr + UART_IER);
+		/* clear Rx/Tx FIFO's */
+		mxser_disable_and_clear_FIFO(info);
 
-	/* clear Rx/Tx FIFO's */
-	mxser_disable_and_clear_FIFO(info);
+		/* read data port to reset things */
+		(void)inb(info->ioaddr + UART_RX);
 
-	/* read data port to reset things */
-	(void) inb(info->ioaddr + UART_RX);
-
-
-	if (info->board->must_hwid)
-		mxser_must_no_sw_flow_control(info->ioaddr);
-
-	spin_unlock_irqrestore(&info->slock, flags);
+		if (info->board->must_hwid)
+			mxser_must_no_sw_flow_control(info->ioaddr);
+	}
 
 	/* make sure ISR is not running while we free the buffer */
 	synchronize_irq(info->board->irq);
···
 static void mxser_flush_buffer(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
-	kfifo_reset(&info->port.xmit_fifo);
+	scoped_guard(spinlock_irqsave, &info->slock) {
+		kfifo_reset(&info->port.xmit_fifo);
 
-	outb(info->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
-		info->ioaddr + UART_FCR);
-
-	spin_unlock_irqrestore(&info->slock, flags);
+		outb(info->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+		     info->ioaddr + UART_FCR);
+	}
 
 	tty_wakeup(tty);
 }
···
 static ssize_t mxser_write(struct tty_struct *tty, const u8 *buf, size_t count)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 	size_t written;
 	bool is_empty;
 
-	spin_lock_irqsave(&info->slock, flags);
-	written = kfifo_in(&info->port.xmit_fifo, buf, count);
-	is_empty = kfifo_is_empty(&info->port.xmit_fifo);
-	spin_unlock_irqrestore(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock) {
+		written = kfifo_in(&info->port.xmit_fifo, buf, count);
+		is_empty = kfifo_is_empty(&info->port.xmit_fifo);
+	}
 
 	if (!is_empty && !tty->flow.stopped)
 		if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
···
 static int mxser_put_char(struct tty_struct *tty, u8 ch)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
-	int ret;
 
-	spin_lock_irqsave(&info->slock, flags);
-	ret = kfifo_put(&info->port.xmit_fifo, ch);
-	spin_unlock_irqrestore(&info->slock, flags);
-
-	return ret;
+	guard(spinlock_irqsave)(&info->slock);
+	return kfifo_put(&info->port.xmit_fifo, ch);
 }
 
 
···
 	struct tty_port *port = &info->port;
 	unsigned int closing_wait, close_delay;
 
-	mutex_lock(&port->mutex);
+	guard(mutex)(&port->mutex);
 
 	close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
 	closing_wait = info->port.closing_wait;
···
 	ss->close_delay = close_delay;
 	ss->closing_wait = closing_wait;
 	ss->custom_divisor = MXSER_CUSTOM_DIVISOR;
-	mutex_unlock(&port->mutex);
+
 	return 0;
 }
 
···
 	struct mxser_port *info = tty->driver_data;
 	struct tty_port *port = &info->port;
 	speed_t baud;
-	unsigned long sl_flags;
 	unsigned int old_speed, close_delay, closing_wait;
-	int retval = 0;
 
 	if (tty_io_error(tty))
 		return -EIO;
 
-	mutex_lock(&port->mutex);
+	guard(mutex)(&port->mutex);
 
-	if (ss->irq != info->board->irq ||
-			ss->port != info->ioaddr) {
-		mutex_unlock(&port->mutex);
+	if (ss->irq != info->board->irq || ss->port != info->ioaddr)
 		return -EINVAL;
-	}
 
 	old_speed = port->flags & ASYNC_SPD_MASK;
 
···
 		if ((ss->baud_base != MXSER_BAUD_BASE) ||
 				(close_delay != port->close_delay) ||
 				(closing_wait != port->closing_wait) ||
-				((ss->flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) {
-			mutex_unlock(&port->mutex);
+				((ss->flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK)))
 			return -EPERM;
-		}
+
 		port->flags = (port->flags & ~ASYNC_USR_MASK) |
 				(ss->flags & ASYNC_USR_MASK);
 	} else {
···
 				(ss->baud_base != MXSER_BAUD_BASE ||
 				ss->custom_divisor !=
 				MXSER_CUSTOM_DIVISOR)) {
-			if (ss->custom_divisor == 0) {
-				mutex_unlock(&port->mutex);
+			if (ss->custom_divisor == 0)
 				return -EINVAL;
-			}
+
 			baud = ss->baud_base / ss->custom_divisor;
 			tty_encode_baud_rate(tty, baud, baud);
 		}
···
 
 	if (tty_port_initialized(port)) {
 		if (old_speed != (port->flags & ASYNC_SPD_MASK)) {
-			spin_lock_irqsave(&info->slock, sl_flags);
+			guard(spinlock_irqsave)(&info->slock);
 			mxser_change_speed(tty, NULL);
-			spin_unlock_irqrestore(&info->slock, sl_flags);
 		}
-	} else {
-		retval = mxser_activate(port, tty);
-		if (retval == 0)
-			tty_port_set_initialized(port, true);
+
+		return 0;
 	}
-	mutex_unlock(&port->mutex);
+
+	int retval = mxser_activate(port, tty);
+	if (retval == 0)
+		tty_port_set_initialized(port, true);
+
 	return retval;
 }
 
···
 static int mxser_get_lsr_info(struct mxser_port *info,
 		unsigned int __user *value)
 {
-	unsigned char status;
 	unsigned int result;
-	unsigned long flags;
+	u8 status;
 
-	spin_lock_irqsave(&info->slock, flags);
-	status = inb(info->ioaddr + UART_LSR);
-	spin_unlock_irqrestore(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock)
+		status = inb(info->ioaddr + UART_LSR);
 	result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
 	return put_user(result, value);
 }
···
 {
 	struct mxser_port *info = tty->driver_data;
 	unsigned char control;
-	unsigned long flags;
 	u8 msr;
 
 	if (tty_io_error(tty))
 		return -EIO;
 
-	spin_lock_irqsave(&info->slock, flags);
-	control = info->MCR;
-	msr = mxser_check_modem_status(tty, info);
-	spin_unlock_irqrestore(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock) {
+		control = info->MCR;
+		msr = mxser_check_modem_status(tty, info);
+	}
 
 	return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
 		    ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
···
 		unsigned int set, unsigned int clear)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 
 	if (tty_io_error(tty))
 		return -EIO;
 
-	spin_lock_irqsave(&info->slock, flags);
+	guard(spinlock_irqsave)(&info->slock);
 
 	if (set & TIOCM_RTS)
 		info->MCR |= UART_MCR_RTS;
···
 		info->MCR &= ~UART_MCR_DTR;
 
 	outb(info->MCR, info->ioaddr + UART_MCR);
-	spin_unlock_irqrestore(&info->slock, flags);
+
 	return 0;
 }
 
···
 		struct async_icount *cprev)
 {
 	struct async_icount cnow;
-	unsigned long flags;
 	int ret;
 
-	spin_lock_irqsave(&info->slock, flags);
-	cnow = info->icount;	/* atomic copy */
-	spin_unlock_irqrestore(&info->slock, flags);
+	/* atomic copy */
+	scoped_guard(spinlock_irqsave, &info->slock)
+		cnow = info->icount;
 
 	ret =	((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
 		((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
···
 		if (opmode & ~OP_MODE_MASK)
 			return -EINVAL;
 
-		spin_lock_irq(&port->slock);
+		guard(spinlock_irq)(&port->slock);
 		val = inb(port->opmode_ioaddr);
 		val &= ~(OP_MODE_MASK << shiftbit);
 		val |= (opmode << shiftbit);
 		outb(val, port->opmode_ioaddr);
-		spin_unlock_irq(&port->slock);
 
 		return 0;
 	}
 
-	spin_lock_irq(&port->slock);
-	opmode = inb(port->opmode_ioaddr) >> shiftbit;
-	spin_unlock_irq(&port->slock);
+	scoped_guard(spinlock_irq, &port->slock)
+		opmode = inb(port->opmode_ioaddr) >> shiftbit;
 
 	return put_user(opmode & OP_MODE_MASK, u_opmode);
 }
···
 {
 	struct mxser_port *info = tty->driver_data;
 	struct async_icount cnow;
-	unsigned long flags;
 	void __user *argp = (void __user *)arg;
 
 	if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE)
···
 		 * Caller should use TIOCGICOUNT to see which one it was
 		 */
 	case TIOCMIWAIT:
-		spin_lock_irqsave(&info->slock, flags);
-		cnow = info->icount;	/* note the counters on entry */
-		spin_unlock_irqrestore(&info->slock, flags);
+		/* note the counters on entry */
+		scoped_guard(spinlock_irqsave, &info->slock)
+			cnow = info->icount;
 
 		return wait_event_interruptible(info->port.delta_msr_wait,
 				mxser_cflags_changed(info, arg, &cnow));
···
 {
 	struct mxser_port *info = tty->driver_data;
 	struct async_icount cnow;
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
-	cnow = info->icount;
-	spin_unlock_irqrestore(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock)
+		cnow = info->icount;
 
 	icount->frame = cnow.frame;
 	icount->brk = cnow.brk;
···
 static void mxser_stop(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
+	guard(spinlock_irqsave)(&info->slock);
 	if (info->IER & UART_IER_THRI)
 		__mxser_stop_tx(info);
-	spin_unlock_irqrestore(&info->slock, flags);
 }
 
 static void mxser_start(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
+	guard(spinlock_irqsave)(&info->slock);
 	if (!kfifo_is_empty(&info->port.xmit_fifo))
 		__mxser_start_tx(info);
-	spin_unlock_irqrestore(&info->slock, flags);
 }
 
 static void mxser_set_termios(struct tty_struct *tty,
 			      const struct ktermios *old_termios)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&info->slock, flags);
-	mxser_change_speed(tty, old_termios);
-	spin_unlock_irqrestore(&info->slock, flags);
+	scoped_guard(spinlock_irqsave, &info->slock)
+		mxser_change_speed(tty, old_termios);
 
 	if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
 		tty->hw_stopped = false;
···
 		tty->flow.stopped = 0;
 
 		if (info->board->must_hwid) {
-			spin_lock_irqsave(&info->slock, flags);
+			guard(spinlock_irqsave)(&info->slock);
 			mxser_must_set_rx_sw_flow_control(info->ioaddr, false);
-			spin_unlock_irqrestore(&info->slock, flags);
 		}
 
 		mxser_start(tty);
···
 
 static bool mxser_tx_empty(struct mxser_port *info)
 {
-	unsigned long flags;
-	u8 lsr;
-
-	spin_lock_irqsave(&info->slock, flags);
-	lsr = inb(info->ioaddr + UART_LSR);
-	spin_unlock_irqrestore(&info->slock, flags);
-
-	return !(lsr & UART_LSR_TEMT);
+	guard(spinlock_irqsave)(&info->slock);
+	return !(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT);
 }
 
 /*
···
 static int mxser_rs_break(struct tty_struct *tty, int break_state)
 {
 	struct mxser_port *info = tty->driver_data;
-	unsigned long flags;
 	u8 lcr;
 
-	spin_lock_irqsave(&info->slock, flags);
+	guard(spinlock_irqsave)(&info->slock);
 	lcr = inb(info->ioaddr + UART_LCR);
 	if (break_state == -1)
 		lcr |= UART_LCR_SBC;
 	else
 		lcr &= ~UART_LCR_SBC;
 	outb(lcr, info->ioaddr + UART_LCR);
-	spin_unlock_irqrestore(&info->slock, flags);
 
 	return 0;
 }
···
 
 static bool mxser_port_isr(struct mxser_port *port)
 {
-	struct tty_struct *tty;
 	u8 iir, status;
-	bool error = false;
 
 	iir = inb(port->ioaddr + UART_IIR);
 	if (iir & UART_IIR_NO_INT)
 		return true;
 
 	iir &= MOXA_MUST_IIR_MASK;
-	tty = tty_port_tty_get(&port->port);
-	if (!tty) {
-		status = inb(port->ioaddr + UART_LSR);
-		outb(port->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
-				port->ioaddr + UART_FCR);
-		inb(port->ioaddr + UART_MSR);
 
-		error = true;
-		goto put_tty;
+	scoped_guard(tty_port_tty, &port->port) {
+		struct tty_struct *tty = scoped_tty();
+
+		status = inb(port->ioaddr + UART_LSR);
+
+		if (port->board->must_hwid) {
+			if (iir == MOXA_MUST_IIR_GDA ||
+			    iir == MOXA_MUST_IIR_RDA ||
+			    iir == MOXA_MUST_IIR_RTO ||
+			    iir == MOXA_MUST_IIR_LSR)
+				status = mxser_receive_chars(tty, port, status);
+		} else {
+			status &= port->read_status_mask;
+			if (status & UART_LSR_DR)
+				status = mxser_receive_chars(tty, port, status);
+		}
+
+		mxser_check_modem_status(tty, port);
+
+		if (port->board->must_hwid) {
+			if (iir == 0x02 && (status & UART_LSR_THRE))
+				mxser_transmit_chars(tty, port);
+		} else {
+			if (status & UART_LSR_THRE)
+				mxser_transmit_chars(tty, port);
+		}
+
+		return false;
 	}
 
 	status = inb(port->ioaddr + UART_LSR);
+	outb(port->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+			port->ioaddr + UART_FCR);
+	inb(port->ioaddr + UART_MSR);
 
-	if (port->board->must_hwid) {
-		if (iir == MOXA_MUST_IIR_GDA ||
-		    iir == MOXA_MUST_IIR_RDA ||
-		    iir == MOXA_MUST_IIR_RTO ||
-		    iir == MOXA_MUST_IIR_LSR)
-			status = mxser_receive_chars(tty, port, status);
-	} else {
-		status &= port->read_status_mask;
-		if (status & UART_LSR_DR)
-			status = mxser_receive_chars(tty, port, status);
-	}
-
-	mxser_check_modem_status(tty, port);
-
-	if (port->board->must_hwid) {
-		if (iir == 0x02 && (status & UART_LSR_THRE))
-			mxser_transmit_chars(tty, port);
-	} else {
-		if (status & UART_LSR_THRE)
-			mxser_transmit_chars(tty, port);
-	}
-
-put_tty:
-	tty_kref_put(tty);
-
-	return error;
+	return true;
 }
 
 /*
···
 			port = &brd->ports[i];
 
 			int_cnt = 0;
-			spin_lock(&port->slock);
+			guard(spinlock)(&port->slock);
 			do {
 				if (mxser_port_isr(port))
 					break;
 			} while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
-			spin_unlock(&port->slock);
 		}
 	}
 

drivers/tty/n_gsm.c

···
 static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr);
 static void gsmld_write_trigger(struct gsm_mux *gsm);
 static void gsmld_write_task(struct work_struct *work);
+static int gsm_modem_send_initial_msc(struct gsm_dlci *dlci);
 
 /**
  *	gsm_fcs_add	-	update FCS
···
 		pr_debug("DLCI %d goes open.\n", dlci->addr);
 	/* Send current modem state */
 	if (dlci->addr) {
-		gsm_modem_update(dlci, 0);
+		gsm_modem_send_initial_msc(dlci);
 	} else {
 		/* Start keep-alive control */
 		gsm->ka_num = 0;
···
 	if (ctrl == NULL)
 		return -ENOMEM;
 	return gsm_control_wait(dlci->gsm, ctrl);
+}
+
+/**
+ * gsm_modem_send_initial_msc - Send initial modem status message
+ *
+ * @dlci channel
+ *
+ * Send an initial MSC message after DLCI open to set the initial
+ * modem status lines. This is only done for basic mode.
+ * Does not wait for a response as we cannot block the input queue
+ * processing.
+ */
+static int gsm_modem_send_initial_msc(struct gsm_dlci *dlci)
+{
+	u8 modembits[2];
+
+	if (dlci->adaption != 1 || dlci->gsm->encoding != GSM_BASIC_OPT)
+		return 0;
+
+	modembits[0] = (dlci->addr << 2) | 2 | EA; /* DLCI, Valid, EA */
+	modembits[1] = (gsm_encode_modem(dlci) << 1) | EA;
+	return gsm_control_command(dlci->gsm, CMD_MSC, (const u8 *)&modembits, 2);
 }
 
 /**

drivers/tty/serdev/core.c

···
 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
 	int ret;
 
-	ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
+	ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON |
+					PD_FLAG_DETACH_POWER_OFF);
 	if (ret)
 		return ret;
 
-	ret = sdrv->probe(to_serdev_device(dev));
-	if (ret)
-		dev_pm_domain_detach(dev, true);
-
-	return ret;
+	return sdrv->probe(to_serdev_device(dev));
 }
 
 static void serdev_drv_remove(struct device *dev)
···
 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
 	if (sdrv->remove)
 		sdrv->remove(to_serdev_device(dev));
-
-	dev_pm_domain_detach(dev, true);
 }
 
 static const struct bus_type serdev_bus_type = {

drivers/tty/serial/8250/8250.h

···
 
 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 
+void serial8250_rpm_get(struct uart_8250_port *p);
+void serial8250_rpm_put(struct uart_8250_port *p);
+DEFINE_GUARD(serial8250_rpm, struct uart_8250_port *,
+	     serial8250_rpm_get(_T), serial8250_rpm_put(_T));
+
 static inline u32 serial_dl_read(struct uart_8250_port *up)
 {
 	return up->dl_read(up);

drivers/tty/serial/8250/8250_core.c

···
 	struct list_head *l, *end = NULL;
 	int pass_counter = 0, handled = 0;
 
-	spin_lock(&i->lock);
+	guard(spinlock)(&i->lock);
 
 	l = i->head;
 	do {
···
 		if (l == i->head && pass_counter++ > PASS_LIMIT)
 			break;
 	} while (l != end);
-
-	spin_unlock(&i->lock);
 
 	return IRQ_RETVAL(handled);
 }
···
 {
 	struct irq_info *i;
 
-	mutex_lock(&hash_mutex);
+	guard(mutex)(&hash_mutex);
 
 	hash_for_each_possible(irq_lists, i, node, up->port.irq)
 		if (i->irq == up->port.irq)
-			goto unlock;
+			return i;
 
 	i = kzalloc(sizeof(*i), GFP_KERNEL);
-	if (i == NULL) {
-		i = ERR_PTR(-ENOMEM);
-		goto unlock;
-	}
+	if (i == NULL)
+		return ERR_PTR(-ENOMEM);
+
 	spin_lock_init(&i->lock);
 	i->irq = up->port.irq;
 	hash_add(irq_lists, &i->node, i->irq);
-unlock:
-	mutex_unlock(&hash_mutex);
 
 	return i;
 }
···
 	if (IS_ERR(i))
 		return PTR_ERR(i);
 
-	spin_lock_irq(&i->lock);
+	scoped_guard(spinlock_irq, &i->lock) {
+		if (i->head) {
+			list_add(&up->list, i->head);
 
-	if (i->head) {
-		list_add(&up->list, i->head);
-		spin_unlock_irq(&i->lock);
+			return 0;
+		}
 
-		ret = 0;
-	} else {
 		INIT_LIST_HEAD(&up->list);
 		i->head = &up->list;
-		spin_unlock_irq(&i->lock);
-		ret = request_irq(up->port.irq, serial8250_interrupt,
-				  up->port.irqflags, up->port.name, i);
-		if (ret < 0)
-			serial_do_unlink(i, up);
 	}
+
+	ret = request_irq(up->port.irq, serial8250_interrupt, up->port.irqflags, up->port.name, i);
+	if (ret < 0)
+		serial_do_unlink(i, up);
 
 	return ret;
 }
···
 {
 	struct irq_info *i;
 
-	mutex_lock(&hash_mutex);
+	guard(mutex)(&hash_mutex);
 
 	hash_for_each_possible(irq_lists, i, node, up->port.irq)
-		if (i->irq == up->port.irq)
-			break;
+		if (i->irq == up->port.irq) {
+			if (WARN_ON(i->head == NULL))
+				return;
 
-	BUG_ON(i == NULL);
-	BUG_ON(i->head == NULL);
+			if (list_empty(i->head))
+				free_irq(up->port.irq, i);
 
-	if (list_empty(i->head))
-		free_irq(up->port.irq, i);
+			serial_do_unlink(i, up);
 
-	serial_do_unlink(i, up);
-	mutex_unlock(&hash_mutex);
+			return;
+		}
+
+	WARN_ON(1);
 }
 
 /*
···
 		serial_unlink_irq_chain(up);
 }
 
-const struct uart_ops *univ8250_port_base_ops = NULL;
+const struct uart_ops *univ8250_port_base_ops;
 struct uart_ops univ8250_port_ops;
 
 static const struct uart_8250_ops univ8250_driver_ops = {
···
 
 static void serial_8250_overrun_backoff_work(struct work_struct *work)
 {
-	struct uart_8250_port *up =
-	    container_of(to_delayed_work(work), struct uart_8250_port,
-			 overrun_backoff);
-	struct uart_port *port = &up->port;
-	unsigned long flags;
+	struct uart_8250_port *up = container_of(to_delayed_work(work), struct uart_8250_port,
+						 overrun_backoff);
 
-	uart_port_lock_irqsave(port, &flags);
+	guard(uart_port_lock_irqsave)(&up->port);
 	up->ier |= UART_IER_RLSI | UART_IER_RDI;
 	serial_out(up, UART_IER, up->ier);
-	uart_port_unlock_irqrestore(port, flags);
 }
 
 /**
···
 int serial8250_register_8250_port(const struct uart_8250_port *up)
 {
 	struct uart_8250_port *uart;
-	int ret = -ENOSPC;
+	int ret;
 
 	if (up->port.uartclk == 0)
 		return -EINVAL;
 
-	mutex_lock(&serial_mutex);
+	guard(mutex)(&serial_mutex);
 
 	uart = serial8250_find_match_or_unused(&up->port);
 	if (!uart) {
···
 		 */
 		uart = serial8250_setup_port(nr_uarts);
 		if (!uart)
-			goto unlock;
+			return -ENOSPC;
 		nr_uarts++;
 	}
 
 	/* Check if it is CIR already. We check this below again, see there why. */
-	if (uart->port.type == PORT_8250_CIR) {
-		ret = -ENODEV;
-		goto unlock;
-	}
+	if (uart->port.type == PORT_8250_CIR)
+		return -ENODEV;
 
 	if (uart->port.dev)
 		uart_remove_one_port(&serial8250_reg, &uart->port);
···
 		uart->overrun_backoff_time_ms = 0;
 	}
 
-unlock:
-	mutex_unlock(&serial_mutex);
-
 	return ret;
 
 err:
 	uart->port.dev = NULL;
-	mutex_unlock(&serial_mutex);
 	return ret;
 }
 EXPORT_SYMBOL(serial8250_register_8250_port);
···
 {
 	struct uart_8250_port *uart = &serial8250_ports[line];
 
-	mutex_lock(&serial_mutex);
+	guard(mutex)(&serial_mutex);
 
 	if (uart->em485) {
-		unsigned long flags;
-
-		uart_port_lock_irqsave(&uart->port, &flags);
+		guard(uart_port_lock_irqsave)(&uart->port);
 		serial8250_em485_destroy(uart);
-		uart_port_unlock_irqrestore(&uart->port, flags);
 	}
 
 	uart_remove_one_port(&serial8250_reg, &uart->port);
···
 	} else {
 		uart->port.dev = NULL;
 	}
-	mutex_unlock(&serial_mutex);
 }
 EXPORT_SYMBOL(serial8250_unregister_port);
 

drivers/tty/serial/8250/8250_omap.c

···
 #include <linux/pm_wakeirq.h>
 #include <linux/dma-mapping.h>
 #include <linux/sys_soc.h>
+#include <linux/reboot.h>
+#include <linux/pinctrl/consumer.h>
 
 #include "8250.h"
 
···
 	spinlock_t rx_dma_lock;
 	bool rx_dma_broken;
 	bool throttled;
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pinctrl_wakeup;
 };
 
 struct omap8250_dma_params {
···
 		serial8250_em485_stop_tx(up, true);
 }
 
-/*
- * OMAP can use "CLK / (16 or 13) / div" for baud rate. And then we have have
- * some differences in how we want to handle flow control.
- */
-static void omap_8250_set_termios(struct uart_port *port,
-				  struct ktermios *termios,
-				  const struct ktermios *old)
+static void omap_8250_set_termios_atomic(struct uart_port *port, struct ktermios *termios,
+					 const struct ktermios *old, unsigned int baud)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 	struct omap8250_priv *priv = port->private_data;
-	unsigned char cval = 0;
-	unsigned int baud;
+	u8 cval;
 
 	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
···
 	if (termios->c_cflag & CMSPAR)
 		cval |= UART_LCR_SPAR;
 
-	/*
-	 * Ask the core to calculate the divisor for us.
-	 */
-	baud = uart_get_baud_rate(port, termios, old,
-				  port->uartclk / 16 / UART_DIV_MAX,
-				  port->uartclk / 13);
 	omap_8250_get_divisor(port, baud, priv);
 
 	/*
 	 * Ok, we're now changing the port state. Do it with
 	 * interrupts disabled.
 	 */
-	pm_runtime_get_sync(port->dev);
-	uart_port_lock_irq(port);
+	guard(serial8250_rpm)(up);
+	guard(uart_port_lock_irq)(port);
 
 	/*
 	 * Update the per-port timeout.
···
 		}
 	}
 	omap8250_restore_regs(up);
+}
 
-	uart_port_unlock_irq(&up->port);
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
+/*
+ * OMAP can use "CLK / (16 or 13) / div" for baud rate. And then we have have
+ * some differences in how we want to handle flow control.
+ */
+static void omap_8250_set_termios(struct uart_port *port,
+				  struct ktermios *termios,
+				  const struct ktermios *old)
+{
+	struct omap8250_priv *priv = port->private_data;
+	unsigned int baud;
+
+	/*
+	 * Ask the core to calculate the divisor for us.
+	 */
+	baud = uart_get_baud_rate(port, termios, old,
+				  port->uartclk / 16 / UART_DIV_MAX,
+				  port->uartclk / 13);
+
+	omap_8250_set_termios_atomic(port, termios, old, baud);
 
 	/* calculate wakeup latency constraint */
 	priv->calc_latency = USEC_PER_SEC * 64 * 8 / baud;
···
 	struct uart_8250_port *up = up_to_u8250p(port);
 	u8 efr;
 
-	pm_runtime_get_sync(port->dev);
-
+	guard(serial8250_rpm)(up);
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
+	guard(uart_port_lock_irq)(port);
 
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 	efr = serial_in(up, UART_EFR);
···
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 	serial_out(up, UART_EFR, efr);
 	serial_out(up, UART_LCR, 0);
-
-	uart_port_unlock_irq(port);
-
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
 }
 
 static void omap_serial_fill_features_erratas(struct uart_8250_port *up,
···
 			return ret;
 	}
 
-	pm_runtime_get_sync(port->dev);
+#ifdef CONFIG_PM
+	up->capabilities |= UART_CAP_RPM;
+#endif
+
+	guard(serial8250_rpm)(up);
 
 	serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 
···
 	}
 
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
-	up->ier = UART_IER_RLSI | UART_IER_RDI;
-	serial_out(up, UART_IER, up->ier);
-	uart_port_unlock_irq(port);
-
-#ifdef CONFIG_PM
-	up->capabilities |= UART_CAP_RPM;
-#endif
+	scoped_guard(uart_port_lock_irq, port) {
+		up->ier = UART_IER_RLSI | UART_IER_RDI;
+		serial_out(up, UART_IER, up->ier);
+	}
 
 	/* Enable module level wake up */
 	priv->wer = OMAP_UART_WER_MOD_WKUP;
···
 	serial_out(up, UART_OMAP_WER, priv->wer);
 
 	if (up->dma && !(priv->habit & UART_HAS_EFR2)) {
-		uart_port_lock_irq(port);
+		guard(uart_port_lock_irq)(port);
 		up->dma->rx_dma(up);
-		uart_port_unlock_irq(port);
 	}
 
 	enable_irq(port->irq);
 
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
 	return 0;
 }
 
···
 	struct uart_8250_port *up = up_to_u8250p(port);
 	struct omap8250_priv *priv = port->private_data;
 
-	pm_runtime_get_sync(port->dev);
+	guard(serial8250_rpm)(up);
 
 	flush_work(&priv->qos_work);
 	if (up->dma)
···
 		serial_out(up, UART_OMAP_EFR2, 0x0);
 
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
-	up->ier = 0;
-	serial_out(up, UART_IER, 0);
-	uart_port_unlock_irq(port);
+	scoped_guard(uart_port_lock_irq, port) {
+		up->ier = 0;
+		serial_out(up, UART_IER, 0);
+	}
+
 	disable_irq_nosync(port->irq);
 	dev_pm_clear_wake_irq(port->dev);
 
···
 	if (up->lcr & UART_LCR_SBC)
 		serial_out(up, UART_LCR, up->lcr & ~UART_LCR_SBC);
 	serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
-
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
 }
 
 static void omap_8250_throttle(struct uart_port *port)
 {
 	struct omap8250_priv *priv = port->private_data;
-	unsigned long flags;
 
-	pm_runtime_get_sync(port->dev);
+	guard(serial8250_rpm)(up_to_u8250p(port));
+	guard(uart_port_lock_irqsave)(port);
 
-	uart_port_lock_irqsave(port, &flags);
 	port->ops->stop_rx(port);
 	priv->throttled = true;
-	uart_port_unlock_irqrestore(port, flags);
-
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
 }
 
 static void omap_8250_unthrottle(struct uart_port *port)
 {
 	struct omap8250_priv *priv = port->private_data;
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 
-	pm_runtime_get_sync(port->dev);
-
+	guard(serial8250_rpm)(up);
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irqsave(port, &flags);
+	guard(uart_port_lock_irqsave)(port);
+
 	priv->throttled = false;
 	if (up->dma)
 		up->dma->rx_dma(up);
 	up->ier |= UART_IER_RLSI | UART_IER_RDI;
 	serial_out(up, UART_IER, up->ier);
-	uart_port_unlock_irqrestore(port, flags);
-
-	pm_runtime_mark_last_busy(port->dev);
-	pm_runtime_put_autosuspend(port->dev);
 }
 
 static int omap8250_rs485_config(struct uart_port *port,
···
 	struct omap8250_priv *priv = p->port.private_data;
 	struct uart_8250_dma *dma = p->dma;
 	struct dma_tx_state     state;
-	unsigned long flags;
 
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irqsave(&p->port, &flags);
+	guard(uart_port_lock_irqsave)(&p->port);
 
 	/*
 	 * If the tx status is not DMA_COMPLETE, then this is a delayed
 	 * completion callback. A previous RX timeout flush would have
 	 * already pushed the data, so exit.
 	 */
-	if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) !=
-			DMA_COMPLETE) {
-		uart_port_unlock_irqrestore(&p->port, flags);
+	if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) != DMA_COMPLETE)
 		return;
-	}
-	__dma_rx_do_complete(p);
-	if (!priv->throttled) {
-		p->ier |= UART_IER_RLSI | UART_IER_RDI;
-		serial_out(p, UART_IER, p->ier);
-		if (!(priv->habit & UART_HAS_EFR2))
-			omap_8250_rx_dma(p);
-	}
 
-	uart_port_unlock_irqrestore(&p->port, flags);
+	__dma_rx_do_complete(p);
+	if (priv->throttled)
+		return;
+
+	p->ier |= UART_IER_RLSI | UART_IER_RDI;
+	serial_out(p, UART_IER, p->ier);
+	if (!(priv->habit & UART_HAS_EFR2))
+		omap_8250_rx_dma(p);
 }
 
 static void omap_8250_rx_dma_flush(struct uart_8250_port *p)
···
 	struct uart_8250_port	*p = param;
 	struct uart_8250_dma	*dma = p->dma;
 	struct tty_port		*tport = &p->port.state->port;
-	unsigned long		flags;
 	bool			en_thri = false;
 	struct omap8250_priv	*priv = p->port.private_data;
 
 	dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
 				UART_XMIT_SIZE, DMA_TO_DEVICE);
 
-	uart_port_lock_irqsave(&p->port, &flags);
+	guard(uart_port_lock_irqsave)(&p->port);
 
 	dma->tx_running = 0;
 
···
 		dma->tx_err = 1;
 		serial8250_set_THRI(p);
 	}
-
-	uart_port_unlock_irqrestore(&p->port, flags);
 }
 
 static int omap_8250_tx_dma(struct uart_8250_port *p)
···
 	return 0;
 }
 
+static int omap8250_select_wakeup_pinctrl(struct device *dev,
+					  struct omap8250_priv *priv)
+{
+	if (IS_ERR_OR_NULL(priv->pinctrl_wakeup))
+		return 0;
+
+	if (!device_may_wakeup(dev))
+		return 0;
+
+	return pinctrl_select_state(priv->pinctrl, priv->pinctrl_wakeup);
+}
+
 static struct omap8250_dma_params am654_dma = {
 	.rx_size = SZ_2K,
 	.rx_trigger = 1,
···
 	priv->line = ret;
 	pm_runtime_mark_last_busy(&pdev->dev);
 	pm_runtime_put_autosuspend(&pdev->dev);
+
+	priv->pinctrl = devm_pinctrl_get(&pdev->dev);
+	if (!IS_ERR_OR_NULL(priv->pinctrl))
+		priv->pinctrl_wakeup = pinctrl_lookup_state(priv->pinctrl, "wakeup");
+
 	return 0;
 err:
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
···
 	struct uart_8250_port *up = serial8250_get_port(priv->line);
 	int err = 0;
 
+	err = omap8250_select_wakeup_pinctrl(dev, priv);
+	if (err) {
+		dev_err(dev, "Failed to select wakeup pinctrl, aborting suspend %pe\n",
+			ERR_PTR(err));
+		return err;
+	}
+
 	serial8250_suspend_port(priv->line);
 
 	err = pm_runtime_resume_and_get(dev);
···
 	struct omap8250_priv *priv = dev_get_drvdata(dev);
 	struct uart_8250_port *up = serial8250_get_port(priv->line);
 	int err;
+
+	err = pinctrl_select_default_state(dev);
+	if (err) {
+		dev_err(dev, "Failed to select default pinctrl state on resume: %pe\n",
+			ERR_PTR(err));
+		return err;
+	}
 
 	if (uart_console(&up->port) && console_suspend_enabled) {
 		err = pm_runtime_force_resume(dev);
···
 		up = serial8250_get_port(priv->line);
 
 	if (up && omap8250_lost_context(up)) {
-		uart_port_lock_irq(&up->port);
+		guard(uart_port_lock_irq)(&up->port);
 		omap8250_restore_regs(up);
-		uart_port_unlock_irq(&up->port);
 	}
 
 	if (up && up->dma && up->dma->rxchan && !(priv->habit & UART_HAS_EFR2)) {
-		uart_port_lock_irq(&up->port);
+		guard(uart_port_lock_irq)(&up->port);
 		omap_8250_rx_dma(up);
-		uart_port_unlock_irq(&up->port);
 	}
 
 	atomic_set(&priv->active, 1);

drivers/tty/serial/8250/8250_platform.c

···
  */
 #include <linux/acpi.h>
 #include <linux/array_size.h>
+#include <linux/cleanup.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
···
 static int serial8250_probe_acpi(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct uart_8250_port uart = { };
 	struct resource *regs;
 	int ret, line;
+
+	struct uart_8250_port *uart __free(kfree) = kzalloc(sizeof(*uart), GFP_KERNEL);
+	if (!uart)
+		return -ENOMEM;
 
 	regs = platform_get_mem_or_io(pdev, 0);
 	if (!regs)
···
 
 	switch (resource_type(regs)) {
 	case IORESOURCE_IO:
-		uart.port.iobase = regs->start;
+		uart->port.iobase = regs->start;
 		break;
 	case IORESOURCE_MEM:
-		uart.port.mapbase = regs->start;
-		uart.port.mapsize = resource_size(regs);
-		uart.port.flags = UPF_IOREMAP;
+		uart->port.mapbase = regs->start;
+		uart->port.mapsize = resource_size(regs);
+		uart->port.flags = UPF_IOREMAP;
 		break;
 	default:
 		return -EINVAL;
 	}
 
 	/* default clock frequency */
-	uart.port.uartclk = 1843200;
-	uart.port.type = PORT_16550A;
-	uart.port.dev = &pdev->dev;
-	uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+	uart->port.uartclk = 1843200;
+	uart->port.type = PORT_16550A;
+	uart->port.dev = &pdev->dev;
+	uart->port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
 
-	ret = uart_read_and_validate_port_properties(&uart.port);
+	ret = uart_read_and_validate_port_properties(&uart->port);
 	/* no interrupt -> fall back to polling */
 	if (ret == -ENXIO)
 		ret = 0;
 	if (ret)
 		return ret;
 
-	line = serial8250_register_8250_port(&uart);
+	line = serial8250_register_8250_port(uart);
 	if (line < 0)
 		return line;
 
···
 
 static int serial8250_probe_platform(struct platform_device *dev, struct plat_serial8250_port *p)
 {
-	struct uart_8250_port uart;
 	int ret, i, irqflag = 0;
 
-	memset(&uart, 0, sizeof(uart));
+	struct uart_8250_port *uart __free(kfree) = kzalloc(sizeof(*uart), GFP_KERNEL);
+	if (!uart)
+		return -ENOMEM;
 
 	if (share_irqs)
 		irqflag = IRQF_SHARED;
 
 	for (i = 0; p && p->flags != 0; p++, i++) {
-		uart.port.iobase	= p->iobase;
-		uart.port.membase	= p->membase;
-		uart.port.irq		= p->irq;
-		uart.port.irqflags	= p->irqflags;
-		uart.port.uartclk	= p->uartclk;
-		uart.port.regshift	= p->regshift;
-		uart.port.iotype	= p->iotype;
-		uart.port.flags		= p->flags;
-		uart.port.mapbase	= p->mapbase;
-		uart.port.mapsize	= p->mapsize;
-		uart.port.hub6		= p->hub6;
-		uart.port.has_sysrq	= p->has_sysrq;
-		uart.port.private_data	= p->private_data;
-		uart.port.type		= p->type;
-		uart.bugs		= p->bugs;
-		uart.port.serial_in	= p->serial_in;
-		uart.port.serial_out	= p->serial_out;
-		uart.dl_read		= p->dl_read;
-		uart.dl_write		= p->dl_write;
-		uart.port.handle_irq	= p->handle_irq;
-		uart.port.handle_break	= p->handle_break;
-		uart.port.set_termios	= p->set_termios;
-		uart.port.set_ldisc	= p->set_ldisc;
-		uart.port.get_mctrl	= p->get_mctrl;
-		uart.port.pm		= p->pm;
-		uart.port.dev		= &dev->dev;
-		uart.port.irqflags	|= irqflag;
-		ret = serial8250_register_8250_port(&uart);
+		uart->port.iobase	= p->iobase;
+		uart->port.membase	= p->membase;
+		uart->port.irq		= p->irq;
+		uart->port.irqflags	= p->irqflags;
+		uart->port.uartclk	= p->uartclk;
+		uart->port.regshift	= p->regshift;
+		uart->port.iotype	= p->iotype;
+		uart->port.flags		= p->flags;
+		uart->port.mapbase	= p->mapbase;
+		uart->port.mapsize	= p->mapsize;
+		uart->port.hub6		= p->hub6;
+		uart->port.has_sysrq	= p->has_sysrq;
+		uart->port.private_data	= p->private_data;
+		uart->port.type		= p->type;
+		uart->bugs		= p->bugs;
+		uart->port.serial_in	= p->serial_in;
+		uart->port.serial_out	= p->serial_out;
+		uart->dl_read		= p->dl_read;
+		uart->dl_write		= p->dl_write;
+		uart->port.handle_irq	= p->handle_irq;
+		uart->port.handle_break	= p->handle_break;
+		uart->port.set_termios	= p->set_termios;
+		uart->port.set_ldisc	= p->set_ldisc;
+		uart->port.get_mctrl	= p->get_mctrl;
+		uart->port.pm		= p->pm;
+		uart->port.dev		= &dev->dev;
+		uart->port.irqflags	|= irqflag;
+		ret = serial8250_register_8250_port(uart);
 		if (ret < 0) {
 			dev_err(&dev->dev, "unable to register port at index %d "
 				"(IO%lx MEM%llx IRQ%d): %d\n", i,

drivers/tty/serial/8250/8250_port.c

···
 }
 EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);
 
-static void serial8250_rpm_get(struct uart_8250_port *p)
+void serial8250_rpm_get(struct uart_8250_port *p)
 {
 	if (!(p->capabilities & UART_CAP_RPM))
 		return;
 	pm_runtime_get_sync(p->port.dev);
 }
+EXPORT_SYMBOL_GPL(serial8250_rpm_get);
 
-static void serial8250_rpm_put(struct uart_8250_port *p)
+void serial8250_rpm_put(struct uart_8250_port *p)
 {
 	if (!(p->capabilities & UART_CAP_RPM))
 		return;
 	pm_runtime_mark_last_busy(p->port.dev);
 	pm_runtime_put_autosuspend(p->port.dev);
 }
+EXPORT_SYMBOL_GPL(serial8250_rpm_put);
 
 /**
  *	serial8250_em485_init() - put uart_8250_port into rs485 emulating
···
 {
 	unsigned char lcr = 0, efr = 0;
 
-	serial8250_rpm_get(p);
+	guard(serial8250_rpm)(p);
 
-	if (p->capabilities & UART_CAP_SLEEP) {
-		/* Synchronize UART_IER access against the console. */
-		uart_port_lock_irq(&p->port);
-		if (p->capabilities & UART_CAP_EFR) {
-			lcr = serial_in(p, UART_LCR);
-			efr = serial_in(p, UART_EFR);
-			serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
-			serial_out(p, UART_EFR, UART_EFR_ECB);
-			serial_out(p, UART_LCR, 0);
-		}
-		serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0);
-		if (p->capabilities & UART_CAP_EFR) {
-			serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
-			serial_out(p, UART_EFR, efr);
-			serial_out(p, UART_LCR, lcr);
-		}
-		uart_port_unlock_irq(&p->port);
+	if (!(p->capabilities & UART_CAP_SLEEP))
+		return;
+
+	/* Synchronize UART_IER access against the console. */
+	guard(uart_port_lock_irq)(&p->port);
+
+	if (p->capabilities & UART_CAP_EFR) {
+		lcr = serial_in(p, UART_LCR);
+		efr = serial_in(p, UART_EFR);
+		serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
+		serial_out(p, UART_EFR, UART_EFR_ECB);
+		serial_out(p, UART_LCR, 0);
 	}
-
-	serial8250_rpm_put(p);
+	serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0);
+	if (p->capabilities & UART_CAP_EFR) {
+		serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
+		serial_out(p, UART_EFR, efr);
+		serial_out(p, UART_LCR, lcr);
+	}
 }
 
 /* Clear the interrupt registers. */
···
 	probe_irq_off(probe_irq_on());
 	save_mcr = serial8250_in_MCR(up);
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
-	save_ier = serial_in(up, UART_IER);
-	uart_port_unlock_irq(port);
+	scoped_guard(uart_port_lock_irq, port)
+		save_ier = serial_in(up, UART_IER);
 	serial8250_out_MCR(up, UART_MCR_OUT1 | UART_MCR_OUT2);
 
 	irqs = probe_irq_on();
···
 			UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
 	}
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
-	serial_out(up, UART_IER, UART_IER_ALL_INTR);
-	uart_port_unlock_irq(port);
+	scoped_guard(uart_port_lock_irq, port)
+		serial_out(up, UART_IER, UART_IER_ALL_INTR);
 	serial8250_clear_interrupts(port);
 	serial_out(up, UART_TX, 0xFF);
 	udelay(20);
···
 
 	serial8250_out_MCR(up, save_mcr);
 	/* Synchronize UART_IER access against the console. */
-	uart_port_lock_irq(port);
-	serial_out(up, UART_IER, save_ier);
-	uart_port_unlock_irq(port);
+	scoped_guard(uart_port_lock_irq, port)
+		serial_out(up, UART_IER, save_ier);
 
 	if (port->flags & UPF_FOURPORT)
 		outb_p(save_ICP, ICP);
···
 	/* Port locked to synchronize UART_IER access against the console. */
 	lockdep_assert_held_once(&port->lock);
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 
 	up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 	serial_port_out(port, UART_IER, up->ier);
-
-	serial8250_rpm_put(up);
 }
 
 /**
···
 	struct uart_8250_em485 *em485 = container_of(t, struct uart_8250_em485,
 			stop_tx_timer);
 	struct uart_8250_port *p = em485->port;
-	unsigned long flags;
 
-	serial8250_rpm_get(p);
-	uart_port_lock_irqsave(&p->port, &flags);
+	guard(serial8250_rpm)(p);
+	guard(uart_port_lock_irqsave)(&p->port);
+
 	if (em485->active_timer == &em485->stop_tx_timer) {
 		p->rs485_stop_tx(p, true);
 		em485->active_timer = NULL;
 		em485->tx_stopped = true;
 	}
-	uart_port_unlock_irqrestore(&p->port, flags);
-	serial8250_rpm_put(p);
 
 	return HRTIMER_NORESTART;
 }
···
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 	__stop_tx(up);
 
 	/*
···
 		up->acr |= UART_ACR_TXDIS;
 		serial_icr_write(up, UART_ACR, up->acr);
 	}
-	serial8250_rpm_put(up);
 }
 
 static inline void __start_tx(struct uart_port *port)
···
 	struct uart_8250_em485 *em485 = container_of(t, struct uart_8250_em485,
 			start_tx_timer);
 	struct uart_8250_port *p = em485->port;
-	unsigned long flags;
 
-	uart_port_lock_irqsave(&p->port, &flags);
+	guard(uart_port_lock_irqsave)(&p->port);
+
 	if (em485->active_timer == &em485->start_tx_timer) {
 		__start_tx(&p->port);
 		em485->active_timer = NULL;
 	}
-	uart_port_unlock_irqrestore(&p->port, flags);
 
 	return HRTIMER_NORESTART;
 }
···
 
 	up->ier |= UART_IER_MSI;
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 	serial_port_out(port, UART_IER, up->ier);
-	serial8250_rpm_put(up);
 }
 
 void serial8250_read_char(struct uart_8250_port *up, u16 lsr)
···
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned int iir;
-	int ret;
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 
 	iir = serial_port_in(port, UART_IIR);
-	ret = serial8250_handle_irq(port, iir);
-
-	serial8250_rpm_put(up);
-	return ret;
+	return serial8250_handle_irq(port, iir);
 }
 
 /*
···
  */
 static int serial8250_tx_threshold_handle_irq(struct uart_port *port)
 {
-	unsigned long flags;
 	unsigned int iir = serial_port_in(port, UART_IIR);
 
 	/* TX Threshold IRQ triggered so load up FIFO */
 	if ((iir & UART_IIR_ID) == UART_IIR_THRI) {
 		struct uart_8250_port *up = up_to_u8250p(port);
 
-		uart_port_lock_irqsave(port, &flags);
+		guard(uart_port_lock_irqsave)(port);
 		serial8250_tx_chars(up);
-		uart_port_unlock_irqrestore(port, flags);
 	}
 
 	iir = serial_port_in(port, UART_IIR);
···
 static unsigned int serial8250_tx_empty(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned int result = 0;
-	unsigned long flags;
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
+	guard(uart_port_lock_irqsave)(port);
 
-	uart_port_lock_irqsave(port, &flags);
 	if (!serial8250_tx_dma_running(up) && uart_lsr_tx_empty(serial_lsr_in(up)))
-		result = TIOCSER_TEMT;
-	uart_port_unlock_irqrestore(port, flags);
+		return TIOCSER_TEMT;
 
-	serial8250_rpm_put(up);
-
-	return result;
+	return 0;
 }
 
 unsigned int serial8250_do_get_mctrl(struct uart_port *port)
···
 	unsigned int status;
 	unsigned int val;
 
-	serial8250_rpm_get(up);
-	status = serial8250_modem_status(up);
-	serial8250_rpm_put(up);
+	scoped_guard(serial8250_rpm, up)
+		status = serial8250_modem_status(up);
 
 	val = serial8250_MSR_to_TIOCM(status);
 	if (up->gpios)
···
 static void serial8250_break_ctl(struct uart_port *port, int break_state)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 
-	serial8250_rpm_get(up);
-	uart_port_lock_irqsave(port, &flags);
+	guard(serial8250_rpm)(up);
+	guard(uart_port_lock_irqsave)(port);
+
 	if (break_state == -1)
 		up->lcr |= UART_LCR_SBC;
 	else
 		up->lcr &= ~UART_LCR_SBC;
 	serial_port_out(port, UART_LCR, up->lcr);
-	uart_port_unlock_irqrestore(port, flags);
-	serial8250_rpm_put(up);
 }
 
 /* Returns true if @bits were set, false on timeout */
···
 static int serial8250_get_poll_char(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	int status;
 	u16 lsr;
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 
 	lsr = serial_port_in(port, UART_LSR);
+	if (!(lsr & UART_LSR_DR))
+		return NO_POLL_CHAR;
 
-	if (!(lsr & UART_LSR_DR)) {
-		status = NO_POLL_CHAR;
-		goto out;
-	}
-
-	status = serial_port_in(port, UART_RX);
-out:
-	serial8250_rpm_put(up);
-	return status;
+	return serial_port_in(port, UART_RX);
 }
 
 
···
 	 * should allow safe lockless usage here.
 	 */
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 	/*
 	 *	First save the IER then disable the interrupts
 	 */
···
 	 */
 	wait_for_xmitr(up, UART_LSR_BOTH_EMPTY);
 	serial_port_out(port, UART_IER, ier);
-	serial8250_rpm_put(up);
 }
 
 #endif /* CONFIG_CONSOLE_POLL */
···
 static void serial8250_startup_special(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 
 	switch (port->type) {
-	case PORT_16C950:
+	case PORT_16C950: {
 		/*
 		 * Wake up and initialize UART
 		 *
 		 * Synchronize UART_IER access against the console.
 		 */
-		uart_port_lock_irqsave(port, &flags);
+		guard(uart_port_lock_irqsave)(port);
 		up->acr = 0;
 		serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B);
 		serial_port_out(port, UART_EFR, UART_EFR_ECB);
···
 		serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B);
 		serial_port_out(port, UART_EFR, UART_EFR_ECB);
 		serial_port_out(port, UART_LCR, 0);
-		uart_port_unlock_irqrestore(port, flags);
 		break;
+	}
 	case PORT_DA830:
 		/*
 		 * Reset the port
 		 *
 		 * Synchronize UART_IER access against the console.
 		 */
-		uart_port_lock_irqsave(port, &flags);
-		serial_port_out(port, UART_IER, 0);
-		serial_port_out(port, UART_DA830_PWREMU_MGMT, 0);
-		uart_port_unlock_irqrestore(port, flags);
+		scoped_guard(uart_port_lock_irqsave, port) {
+			serial_port_out(port, UART_IER, 0);
+			serial_port_out(port, UART_DA830_PWREMU_MGMT, 0);
+		}
 		mdelay(10);
 
 		/* Enable Tx, Rx and free run mode */
···
 static void serial8250_THRE_test(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 	bool iir_noint1, iir_noint2;
 
 	if (!port->irq)
···
 	 *
 	 * Synchronize UART_IER access against the console.
 	 */
-	uart_port_lock_irqsave(port, &flags);
-
-	wait_for_xmitr(up, UART_LSR_THRE);
-	serial_port_out_sync(port, UART_IER, UART_IER_THRI);
-	udelay(1); /* allow THRE to set */
-	iir_noint1 = serial_port_in(port, UART_IIR) & UART_IIR_NO_INT;
-	serial_port_out(port, UART_IER, 0);
-	serial_port_out_sync(port, UART_IER, UART_IER_THRI);
-	udelay(1); /* allow a working UART time to re-assert THRE */
-	iir_noint2 = serial_port_in(port, UART_IIR) & UART_IIR_NO_INT;
-	serial_port_out(port, UART_IER, 0);
-
-	uart_port_unlock_irqrestore(port, flags);
+	scoped_guard(uart_port_lock_irqsave, port) {
+		wait_for_xmitr(up, UART_LSR_THRE);
+		serial_port_out_sync(port, UART_IER, UART_IER_THRI);
+		udelay(1); /* allow THRE to set */
+		iir_noint1 = serial_port_in(port, UART_IIR) & UART_IIR_NO_INT;
+		serial_port_out(port, UART_IER, 0);
+		serial_port_out_sync(port, UART_IER, UART_IER_THRI);
+		udelay(1); /* allow a working UART time to re-assert THRE */
+		iir_noint2 = serial_port_in(port, UART_IIR) & UART_IIR_NO_INT;
+		serial_port_out(port, UART_IER, 0);
+	}
 
 	if (port->irqflags & IRQF_SHARED)
 		enable_irq(port->irq);
···
 
 static void serial8250_initialize(struct uart_port *port)
 {
-	unsigned long flags;
-
-	uart_port_lock_irqsave(port, &flags);
+	guard(uart_port_lock_irqsave)(port);
 	serial_port_out(port, UART_LCR, UART_LCR_WLEN8);
 
 	serial8250_init_mctrl(port);
 	serial8250_iir_txen_test(port);
-	uart_port_unlock_irqrestore(port, flags);
 }
 
 int serial8250_do_startup(struct uart_port *port)
···
 	if (port->iotype != up->cur_iotype)
 		set_io_from_upio(port);
 
-	serial8250_rpm_get(up);
+	guard(serial8250_rpm)(up);
 
 	serial8250_startup_special(port);
 
···
 	if (!(port->flags & UPF_BUGGY_UART) &&
 	    (serial_port_in(port, UART_LSR) == 0xff)) {
 		dev_info_ratelimited(port->dev, "LSR safety check engaged!\n");
-		retval = -ENODEV;
-		goto out;
+		return -ENODEV;
 	}
 
 	serial8250_set_TRG_levels(port);
···
 
 	retval = up->ops->setup_irq(up);
 	if (retval)
-		goto out;
+		return retval;
 
 	serial8250_THRE_test(port);
 
···
 		outb_p(0x80, icp);
 		inb_p(icp);
 	}
-	retval = 0;
-out:
-	serial8250_rpm_put(up);
-	return retval;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(serial8250_do_startup);
 
···
 void serial8250_do_shutdown(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 
 	serial8250_rpm_get(up);
 	/*
···
 	 *
 	 * Synchronize UART_IER access against the console.
 	 */
-	uart_port_lock_irqsave(port, &flags);
-	up->ier = 0;
-	serial_port_out(port, UART_IER, 0);
-	uart_port_unlock_irqrestore(port, flags);
+	scoped_guard(uart_port_lock_irqsave, port) {
+		up->ier = 0;
+		serial_port_out(port, UART_IER, 0);
+	}
 
 	synchronize_irq(port->irq);
 
 	if (up->dma)
 		serial8250_release_dma(up);
 
-	uart_port_lock_irqsave(port, &flags);
-	if (port->flags & UPF_FOURPORT) {
-		/* reset interrupts on the AST Fourport board */
-		inb((port->iobase & 0xfe0) | 0x1f);
-		port->mctrl |= TIOCM_OUT1;
-	} else
-		port->mctrl &= ~TIOCM_OUT2;
+	scoped_guard(uart_port_lock_irqsave, port) {
+		if (port->flags & UPF_FOURPORT) {
+			/* reset interrupts on the AST Fourport board */
+			inb((port->iobase & 0xfe0) | 0x1f);
+			port->mctrl |= TIOCM_OUT1;
+		} else
+			port->mctrl &= ~TIOCM_OUT2;
 
-	serial8250_set_mctrl(port, port->mctrl);
-	uart_port_unlock_irqrestore(port, flags);
+		serial8250_set_mctrl(port, port->mctrl);
+	}
 
 	/*
 	 * Disable break condition and FIFOs
···
 void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty;
 
-	tty = tty_port_tty_get(tport);
-	if (!tty) {
-		mutex_lock(&tport->mutex);
+	scoped_guard(tty_port_tty, tport) {
+		struct tty_struct *tty = scoped_tty();
+
+		guard(rwsem_write)(&tty->termios_rwsem);
+		guard(mutex)(&tport->mutex);
+
+		if (port->uartclk == uartclk)
+			return;
+
 		port->uartclk = uartclk;
-		mutex_unlock(&tport->mutex);
+
+		if (!tty_port_initialized(tport))
+			return;
+
+		serial8250_do_set_termios(port, &tty->termios, NULL);
+
 		return;
 	}
-
-	down_write(&tty->termios_rwsem);
-	mutex_lock(&tport->mutex);
-
-	if (port->uartclk == uartclk)
-		goto out_unlock;
-
+	guard(mutex)(&tport->mutex);
 	port->uartclk = uartclk;
-
-	if (!tty_port_initialized(tport))
-		goto out_unlock;
-
-	serial8250_do_set_termios(port, &tty->termios, NULL);
-
-out_unlock:
-	mutex_unlock(&tport->mutex);
-	up_write(&tty->termios_rwsem);
-	tty_kref_put(tty);
 }
 EXPORT_SYMBOL_GPL(serial8250_update_uartclk);
 
···
 		          const struct ktermios *old)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
-	unsigned long flags;
 	unsigned int baud, quot, frac = 0;
 	u8 lcr;
 
···
 	quot = serial8250_get_divisor(port, baud, &frac);
 
 	/*
-	 * Ok, we're now changing the port state.  Do it with
-	 * interrupts disabled.
+	 * Ok, we're now changing the port state. Do it with interrupts disabled.
 	 *
 	 * Synchronize UART_IER access against the console.
 	 */
-	serial8250_rpm_get(up);
-	uart_port_lock_irqsave(port, &flags);
+	scoped_guard(serial8250_rpm, up) {
+		guard(uart_port_lock_irqsave)(port);
 
-	up->lcr = lcr;
-	serial8250_set_trigger_for_slow_speed(port, termios, baud);
-	serial8250_set_afe(port, termios);
-	uart_update_timeout(port, termios->c_cflag, baud);
-	serial8250_set_errors_and_ignores(port, termios);
-	serial8250_set_ier(port, termios);
-	serial8250_set_efr(port, termios);
-	serial8250_set_divisor(port, baud, quot, frac);
-	serial8250_set_fcr(port, termios);
-	serial8250_set_mctrl(port, port->mctrl);
-
-	uart_port_unlock_irqrestore(port, flags);
-	serial8250_rpm_put(up);
+		up->lcr = lcr;
+		serial8250_set_trigger_for_slow_speed(port, termios, baud);
+		serial8250_set_afe(port, termios);
+		uart_update_timeout(port, termios->c_cflag, baud);
+		serial8250_set_errors_and_ignores(port, termios);
+		serial8250_set_ier(port, termios);
+		serial8250_set_efr(port, termios);
+		serial8250_set_divisor(port, baud, quot, frac);
+		serial8250_set_fcr(port, termios);
+		serial8250_set_mctrl(port, port->mctrl);
+	}
 
 	/* Don't rewrite B0 */
 	if (tty_termios_baud_rate(termios))
···
 {
 	if (termios->c_line == N_PPS) {
 		port->flags |= UPF_HARDPPS_CD;
-		uart_port_lock_irq(port);
+		guard(uart_port_lock_irq)(port);
 		serial8250_enable_ms(port);
-		uart_port_unlock_irq(port);
 	} else {
 		port->flags &= ~UPF_HARDPPS_CD;
 		if (!UART_ENABLE_MS(port, termios->c_cflag)) {
-			uart_port_lock_irq(port);
+			guard(uart_port_lock_irq)(port);
 			serial8250_disable_ms(port);
-			uart_port_unlock_irq(port);
 		}
 	}
 }

drivers/tty/serial/8250/8250_rsa.c

···
 		return;
 
 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
-		uart_port_lock_irq(&up->port);
+		guard(uart_port_lock_irq)(&up->port);
 		__rsa_enable(up);
-		uart_port_unlock_irq(&up->port);
 	}
 	if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
 		serial_out(up, UART_RSA_FRR, 0);
···
 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
 		return;
 
-	uart_port_lock_irq(&up->port);
+	guard(uart_port_lock_irq)(&up->port);
+
 	mode = serial_in(up, UART_RSA_MSR);
 	result = !(mode & UART_RSA_MSR_FIFO);
 
···
 
 	if (result)
 		up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
-	uart_port_unlock_irq(&up->port);
 }
 EXPORT_SYMBOL_FOR_MODULES(rsa_disable, "8250_base");
 

drivers/tty/serial/Kconfig

···
 	depends on CPM2 || CPM1
 	select SERIAL_CORE
 	help
-	  This driver supports the SCC and SMC serial ports on Motorola 
+	  This driver supports the SCC and SMC serial ports on Motorola
 	  embedded PowerPC that contain a CPM1 (8xx) or CPM2 (8xxx)
 
 config SERIAL_CPM_CONSOLE
···
 	help
 	  Serial console driver for Qualcomm Technologies Inc's GENI based
 	  QUP hardware.
+
+config SERIAL_QCOM_GENI_UART_PORTS
+	int "Maximum number of GENI UART ports"
+	depends on SERIAL_QCOM_GENI
+	default "8"
+	help
+	  Set this to the maximum number of serial ports you want the driver
+	  to support.
 
 config SERIAL_VT8500
 	bool "VIA VT8500 on-chip serial port support"
···
 
 config SERIAL_STM32_CONSOLE
 	bool "Support for console on STM32"
-	depends on SERIAL_STM32=y
+	depends on SERIAL_STM32
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 

drivers/tty/serial/ip22zilog.c

···
 #include <linux/console.h>
 #include <linux/spinlock.h>
 #include <linux/init.h>
+#include <linux/platform_device.h>
 
 #include <linux/io.h>
 #include <asm/irq.h>
···
 #define ZSDELAY_LONG()		udelay(20)
 #define ZS_WSYNC(channel)	do { } while (0)
 
-#define NUM_IP22ZILOG		1
-#define NUM_CHANNELS		(NUM_IP22ZILOG * 2)
+#define NUM_CHANNELS		2
+#define CHANNEL_B		0
+#define CHANNEL_A		1
 
 #define ZS_CLOCK		3672000	/* Zilog input clock rate. */
 #define ZS_CLOCK_DIVISOR	16      /* Divisor this driver uses. */
···
 struct uart_ip22zilog_port {
 	struct uart_port		port;
 
-	/* IRQ servicing chain.  */
-	struct uart_ip22zilog_port	*next;
-
 	/* Current values of Zilog write registers.  */
 	unsigned char			curregs[NUM_ZSREGS];
 
···
 #define IP22ZILOG_FLAG_IS_CONS		0x00000004
 #define IP22ZILOG_FLAG_IS_KGDB		0x00000008
 #define IP22ZILOG_FLAG_MODEM_STATUS	0x00000010
-#define IP22ZILOG_FLAG_IS_CHANNEL_A	0x00000020
 #define IP22ZILOG_FLAG_REGS_HELD	0x00000040
 #define IP22ZILOG_FLAG_TX_STOPPED	0x00000080
 #define IP22ZILOG_FLAG_TX_ACTIVE	0x00000100
···
 	unsigned char			prev_status;
 };
 
+static struct uart_ip22zilog_port ip22zilog_port_table[NUM_CHANNELS];
+
 #define ZILOG_CHANNEL_FROM_PORT(PORT)	((struct zilog_channel *)((PORT)->membase))
 #define UART_ZILOG(PORT)		((struct uart_ip22zilog_port *)(PORT))
 #define IP22ZILOG_GET_CURR_REG(PORT, REGNUM)		\
···
 #define ZS_IS_CONS(UP)	((UP)->flags & IP22ZILOG_FLAG_IS_CONS)
 #define ZS_IS_KGDB(UP)	((UP)->flags & IP22ZILOG_FLAG_IS_KGDB)
 #define ZS_WANTS_MODEM_STATUS(UP)	((UP)->flags & IP22ZILOG_FLAG_MODEM_STATUS)
-#define ZS_IS_CHANNEL_A(UP)	((UP)->flags & IP22ZILOG_FLAG_IS_CHANNEL_A)
 #define ZS_REGS_HELD(UP)	((UP)->flags & IP22ZILOG_FLAG_REGS_HELD)
 #define ZS_TX_STOPPED(UP)	((UP)->flags & IP22ZILOG_FLAG_TX_STOPPED)
 #define ZS_TX_ACTIVE(UP)	((UP)->flags & IP22ZILOG_FLAG_TX_ACTIVE)
···
 
 static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
 {
-	struct uart_ip22zilog_port *up = dev_id;
+	struct uart_ip22zilog_port *up;
+	struct zilog_channel *channel;
+	unsigned char r3;
+	bool push = false;
 
-	while (up) {
-		struct zilog_channel *channel
-			= ZILOG_CHANNEL_FROM_PORT(&up->port);
-		unsigned char r3;
-		bool push = false;
+	up = &ip22zilog_port_table[CHANNEL_A];
+	channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
 
-		uart_port_lock(&up->port);
-		r3 = read_zsreg(channel, R3);
+	uart_port_lock(&up->port);
+	r3 = read_zsreg(channel, R3);
 
-		/* Channel A */
-		if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
-			writeb(RES_H_IUS, &channel->control);
-			ZSDELAY();
-			ZS_WSYNC(channel);
+	/* Channel A */
+	if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+		writeb(RES_H_IUS, &channel->control);
+		ZSDELAY();
+		ZS_WSYNC(channel);
 
-			if (r3 & CHARxIP)
-				push = ip22zilog_receive_chars(up, channel);
-			if (r3 & CHAEXT)
-				ip22zilog_status_handle(up, channel);
-			if (r3 & CHATxIP)
-				ip22zilog_transmit_chars(up, channel);
-		}
-		uart_port_unlock(&up->port);
-
-		if (push)
-			tty_flip_buffer_push(&up->port.state->port);
-
-		/* Channel B */
-		up = up->next;
-		channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
-		push = false;
-
-		uart_port_lock(&up->port);
-		if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
-			writeb(RES_H_IUS, &channel->control);
-			ZSDELAY();
-			ZS_WSYNC(channel);
-
-			if (r3 & CHBRxIP)
-				push = ip22zilog_receive_chars(up, channel);
-			if (r3 & CHBEXT)
-				ip22zilog_status_handle(up, channel);
-			if (r3 & CHBTxIP)
-				ip22zilog_transmit_chars(up, channel);
-		}
-		uart_port_unlock(&up->port);
-
-		if (push)
-			tty_flip_buffer_push(&up->port.state->port);
-
-		up = up->next;
+		if (r3 & CHARxIP)
+			push = ip22zilog_receive_chars(up, channel);
+		if (r3 & CHAEXT)
+			ip22zilog_status_handle(up, channel);
+		if (r3 & CHATxIP)
+			ip22zilog_transmit_chars(up, channel);
 	}
+	uart_port_unlock(&up->port);
+
+	if (push)
+		tty_flip_buffer_push(&up->port.state->port);
+
+	/* Channel B */
+	up = &ip22zilog_port_table[CHANNEL_B];
+	channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+	push = false;
+
+	uart_port_lock(&up->port);
+	if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+		writeb(RES_H_IUS, &channel->control);
+		ZSDELAY();
+		ZS_WSYNC(channel);
+
+		if (r3 & CHBRxIP)
+			push = ip22zilog_receive_chars(up, channel);
+		if (r3 & CHBEXT)
+			ip22zilog_status_handle(up, channel);
+		if (r3 & CHBTxIP)
+			ip22zilog_transmit_chars(up, channel);
+	}
+	uart_port_unlock(&up->port);
+
+	if (push)
+		tty_flip_buffer_push(&up->port.state->port);
 
 	return IRQ_HANDLED;
 }
···
 		udelay(100);
 	}
 
-	if (!ZS_IS_CHANNEL_A(up)) {
-		up++;
-		channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
-	}
+	up = &ip22zilog_port_table[CHANNEL_A];
+	channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
 	write_zsreg(channel, R9, FHWRES);
 	ZSDELAY_LONG();
 	(void) read_zsreg(channel, R0);
 
 	up->flags |= IP22ZILOG_FLAG_RESET_DONE;
-	up->next->flags |= IP22ZILOG_FLAG_RESET_DONE;
+	up = &ip22zilog_port_table[CHANNEL_B];
+	up->flags |= IP22ZILOG_FLAG_RESET_DONE;
 }
 
 static void __ip22zilog_startup(struct uart_ip22zilog_port *up)
···
 	.verify_port	=	ip22zilog_verify_port,
 };
 
-static struct uart_ip22zilog_port *ip22zilog_port_table;
-static struct zilog_layout **ip22zilog_chip_regs;
-
-static struct uart_ip22zilog_port *ip22zilog_irq_chain;
-static int zilog_irq = -1;
-
-static void * __init alloc_one_table(unsigned long size)
-{
-	return kzalloc(size, GFP_KERNEL);
-}
-
-static void __init ip22zilog_alloc_tables(void)
-{
-	ip22zilog_port_table = (struct uart_ip22zilog_port *)
-		alloc_one_table(NUM_CHANNELS * sizeof(struct uart_ip22zilog_port));
-	ip22zilog_chip_regs = (struct zilog_layout **)
-		alloc_one_table(NUM_IP22ZILOG * sizeof(struct zilog_layout *));
-
-	if (ip22zilog_port_table == NULL || ip22zilog_chip_regs == NULL) {
-		panic("IP22-Zilog: Cannot allocate IP22-Zilog tables.");
-	}
-}
-
-/* Get the address of the registers for IP22-Zilog instance CHIP.  */
-static struct zilog_layout * __init get_zs(int chip)
-{
-	unsigned long base;
-
-	if (chip < 0 || chip >= NUM_IP22ZILOG) {
-		panic("IP22-Zilog: Illegal chip number %d in get_zs.", chip);
-	}
-
-	/* Not probe-able, hard code it. */
-	base = (unsigned long) &sgioc->uart;
-
-	zilog_irq = SGI_SERIAL_IRQ;
-	request_mem_region(base, 8, "IP22-Zilog");
-
-	return (struct zilog_layout *) base;
-}
-
 #define ZS_PUT_CHAR_MAX_DELAY	2000	/* 10 ms */
 
 #ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE
···
 #endif
 };
 
-static void __init ip22zilog_prepare(void)
+static void __init ip22zilog_prepare(struct uart_ip22zilog_port *up)
 {
 	unsigned char sysrq_on = IS_ENABLED(CONFIG_SERIAL_IP22_ZILOG_CONSOLE);
-	struct uart_ip22zilog_port *up;
-	struct zilog_layout *rp;
-	int channel, chip;
+	int brg;
 
-	/*
-	 * Temporary fix.
-	 */
-	for (channel = 0; channel < NUM_CHANNELS; channel++)
-		spin_lock_init(&ip22zilog_port_table[channel].port.lock);
+	spin_lock_init(&up->port.lock);
 
-	ip22zilog_irq_chain = &ip22zilog_port_table[NUM_CHANNELS - 1];
-        up = &ip22zilog_port_table[0];
-	for (channel = NUM_CHANNELS - 1 ; channel > 0; channel--)
-		up[channel].next = &up[channel - 1];
-	up[channel].next = NULL;
+	up->port.iotype = UPIO_MEM;
+	up->port.uartclk = ZS_CLOCK;
+	up->port.fifosize = 1;
+	up->port.has_sysrq = sysrq_on;
+	up->port.ops = &ip22zilog_pops;
+	up->port.type = PORT_IP22ZILOG;
 
-	for (chip = 0; chip < NUM_IP22ZILOG; chip++) {
-		if (!ip22zilog_chip_regs[chip]) {
-			ip22zilog_chip_regs[chip] = rp = get_zs(chip);
-
-			up[(chip * 2) + 0].port.membase = (char *) &rp->channelB;
-			up[(chip * 2) + 1].port.membase = (char *) &rp->channelA;
-
-			/* In theory mapbase is the physical address ...  */
-			up[(chip * 2) + 0].port.mapbase =
-				(unsigned long) ioremap((unsigned long) &rp->channelB, 8);
-			up[(chip * 2) + 1].port.mapbase =
-				(unsigned long) ioremap((unsigned long) &rp->channelA, 8);
-		}
-
-		/* Channel A */
-		up[(chip * 2) + 0].port.iotype = UPIO_MEM;
-		up[(chip * 2) + 0].port.irq = zilog_irq;
-		up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
-		up[(chip * 2) + 0].port.fifosize = 1;
-		up[(chip * 2) + 0].port.has_sysrq = sysrq_on;
-		up[(chip * 2) + 0].port.ops = &ip22zilog_pops;
-		up[(chip * 2) + 0].port.type = PORT_IP22ZILOG;
-		up[(chip * 2) + 0].port.flags = 0;
-		up[(chip * 2) + 0].port.line = (chip * 2) + 0;
-		up[(chip * 2) + 0].flags = 0;
-
-		/* Channel B */
-		up[(chip * 2) + 1].port.iotype = UPIO_MEM;
-		up[(chip * 2) + 1].port.irq = zilog_irq;
-		up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
-		up[(chip * 2) + 1].port.fifosize = 1;
-		up[(chip * 2) + 1].port.has_sysrq = sysrq_on;
-		up[(chip * 2) + 1].port.ops = &ip22zilog_pops;
-		up[(chip * 2) + 1].port.type = PORT_IP22ZILOG;
-		up[(chip * 2) + 1].port.line = (chip * 2) + 1;
-		up[(chip * 2) + 1].flags |= IP22ZILOG_FLAG_IS_CHANNEL_A;
-	}
-
-	for (channel = 0; channel < NUM_CHANNELS; channel++) {
-		struct uart_ip22zilog_port *up = &ip22zilog_port_table[channel];
-		int brg;
-
-		/* Normal serial TTY. */
-		up->parity_mask = 0xff;
-		up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
-		up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
-		up->curregs[R3] = RxENAB | Rx8;
-		up->curregs[R5] = TxENAB | Tx8;
-		up->curregs[R9] = NV | MIE;
-		up->curregs[R10] = NRZ;
-		up->curregs[R11] = TCBR | RCBR;
-		brg = BPS_TO_BRG(9600, ZS_CLOCK / ZS_CLOCK_DIVISOR);
-		up->curregs[R12] = (brg & 0xff);
-		up->curregs[R13] = (brg >> 8) & 0xff;
-		up->curregs[R14] = BRENAB;
-	}
+	/* Normal serial TTY. */
+	up->parity_mask = 0xff;
+	up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+	up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+	up->curregs[R3] = RxENAB | Rx8;
+	up->curregs[R5] = TxENAB | Tx8;
+	up->curregs[R9] = NV | MIE;
+	up->curregs[R10] = NRZ;
+	up->curregs[R11] = TCBR | RCBR;
+	brg = BPS_TO_BRG(9600, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+	up->curregs[R12] = (brg & 0xff);
+	up->curregs[R13] = (brg >> 8) & 0xff;
+	up->curregs[R14] = BRENAB;
 }
 
-static int __init ip22zilog_ports_init(void)
+static int ip22zilog_probe(struct platform_device *pdev)
 {
-	int ret;
+	struct uart_ip22zilog_port *up;
+	char __iomem *membase;
+	struct resource *res;
+	int irq;
+	int i;
 
-	printk(KERN_INFO "Serial: IP22 Zilog driver (%d chips).\n", NUM_IP22ZILOG);
+	up = &ip22zilog_port_table[CHANNEL_B];
+	if (up->port.dev)
+		return -ENOSPC;
 
-	ip22zilog_prepare();
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
-	if (request_irq(zilog_irq, ip22zilog_interrupt, 0,
-			"IP22-Zilog", ip22zilog_irq_chain)) {
+	membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(membase))
+		return PTR_ERR(membase);
+
+	ip22zilog_prepare(up);
+
+	up->port.mapbase = res->start + offsetof(struct zilog_layout, channelB);
+	up->port.membase = membase + offsetof(struct zilog_layout, channelB);
+	up->port.line = 0;
+	up->port.dev = &pdev->dev;
+	up->port.irq = irq;
+
+	up = &ip22zilog_port_table[CHANNEL_A];
+	ip22zilog_prepare(up);
+
+	up->port.mapbase = res->start + offsetof(struct zilog_layout, channelA);
+	up->port.membase = membase + offsetof(struct zilog_layout, channelA);
+	up->port.line = 1;
+	up->port.dev = &pdev->dev;
+	up->port.irq = irq;
+
+	if (request_irq(irq, ip22zilog_interrupt, 0,
+			"IP22-Zilog", NULL)) {
 		panic("IP22-Zilog: Unable to register zs interrupt handler.\n");
 	}
 
-	ret = uart_register_driver(&ip22zilog_reg);
-	if (ret == 0) {
-		int i;
-
-		for (i = 0; i < NUM_CHANNELS; i++) {
-			struct uart_ip22zilog_port *up = &ip22zilog_port_table[i];
-
-			uart_add_one_port(&ip22zilog_reg, &up->port);
-		}
-	}
-
-	return ret;
-}
-
-static int __init ip22zilog_init(void)
-{
-	/* IP22 Zilog setup is hard coded, no probing to do.  */
-	ip22zilog_alloc_tables();
-	ip22zilog_ports_init();
+	for (i = 0; i < NUM_CHANNELS; i++)
+		uart_add_one_port(&ip22zilog_reg,
+				  &ip22zilog_port_table[i].port);
 
 	return 0;
 }
 
-static void __exit ip22zilog_exit(void)
+static void ip22zilog_remove(struct platform_device *pdev)
 {
 	int i;
-	struct uart_ip22zilog_port *up;
 
 	for (i = 0; i < NUM_CHANNELS; i++) {
-		up = &ip22zilog_port_table[i];
-
-		uart_remove_one_port(&ip22zilog_reg, &up->port);
+		uart_remove_one_port(&ip22zilog_reg,
+				     &ip22zilog_port_table[i].port);
+		ip22zilog_port_table[i].port.dev = NULL;
 	}
+}
 
-	/* Free IO mem */
-	up = &ip22zilog_port_table[0];
-	for (i = 0; i < NUM_IP22ZILOG; i++) {
-		if (up[(i * 2) + 0].port.mapbase) {
-		   iounmap((void*)up[(i * 2) + 0].port.mapbase);
-		   up[(i * 2) + 0].port.mapbase = 0;
-		}
-		if (up[(i * 2) + 1].port.mapbase) {
-			iounmap((void*)up[(i * 2) + 1].port.mapbase);
-			up[(i * 2) + 1].port.mapbase = 0;
-		}
+static struct platform_driver ip22zilog_driver = {
+	.probe	= ip22zilog_probe,
+	.remove	= ip22zilog_remove,
+	.driver	= {
+		.name = "ip22zilog"
 	}
+};
 
+static int __init ip22zilog_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&ip22zilog_reg);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&ip22zilog_driver);
+	if (ret)
+		uart_unregister_driver(&ip22zilog_reg);
+
+	return ret;
+
+}
+
+static void __exit ip22zilog_exit(void)
+{
 	uart_unregister_driver(&ip22zilog_reg);
+	platform_driver_unregister(&ip22zilog_driver);
 }
 
 module_init(ip22zilog_init);

drivers/tty/serial/max3100.c

···
 			break;
 	if (i == MAX_MAX3100) {
 		mutex_unlock(&max3100s_lock);
-		return dev_err_probe(dev, -ENOMEM, "too many MAX3100 chips\n");
+		return dev_err_probe(dev, -ENOSPC, "too many MAX3100 chips\n");
 	}
 
 	max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL);

drivers/tty/serial/max310x.c

···
 	bool handled = false;
 
 	if (s->devtype->nr > 1) {
+		bool done;
+
 		do {
 			unsigned int val = ~0;
+			unsigned long irq;
+			unsigned int port;
+
+			done = true;
 
 			WARN_ON_ONCE(regmap_read(s->regmap,
 						 MAX310X_GLOBALIRQ_REG, &val));
-			val = ((1 << s->devtype->nr) - 1) & ~val;
-			if (!val)
-				break;
-			if (max310x_port_irq(s, fls(val) - 1) == IRQ_HANDLED)
-				handled = true;
-		} while (1);
+
+			irq = val;
+
+			for_each_clear_bit(port, &irq, s->devtype->nr) {
+				done = false;
+
+				if (max310x_port_irq(s, port) == IRQ_HANDLED)
+					handled = true;
+			}
+
+		} while (!done);
 	} else {
 		if (max310x_port_irq(s, 0) == IRQ_HANDLED)
 			handled = true;
···
 	/* Alloc port structure */
 	s = devm_kzalloc(dev, struct_size(s, p, devtype->nr), GFP_KERNEL);
 	if (!s)
-		return dev_err_probe(dev, -ENOMEM,
-				     "Error allocating port structure\n");
+		return -ENOMEM;
 
 	/* Always ask for fixed clock rate from a property. */
 	device_property_read_u32(dev, "clock-frequency", &uartclk);
···
 		port_client = devm_i2c_new_dummy_device(&client->dev,
 							client->adapter,
 							port_addr);
+		if (IS_ERR(port_client))
+			return PTR_ERR(port_client);
 
 		regcfg_i2c.name = max310x_regmap_name(i);
 		regmaps[i] = devm_regmap_init_i2c(port_client, &regcfg_i2c);

drivers/tty/serial/msm_serial.c

···
 
 			if (result == baud)
 				break;
-		} else if (entry->divisor > divisor) {
+		} else {
 			old = target;
 			target = clk_round_rate(msm_port->clk, old + 1);
 			/*

drivers/tty/serial/mvebu-uart.c

···
 	return parent_rate / uart_clock_base->div;
 }
 
-static long mvebu_uart_clock_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *parent_rate)
+static int mvebu_uart_clock_determine_rate(struct clk_hw *hw,
+					   struct clk_rate_request *req)
 {
 	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
 	struct mvebu_uart_clock_base *uart_clock_base =
 						to_uart_clock_base(uart_clock);
 
-	return *parent_rate / uart_clock_base->div;
+	req->rate = req->best_parent_rate / uart_clock_base->div;
+
+	return 0;
 }
 
 static int mvebu_uart_clock_set_rate(struct clk_hw *hw, unsigned long rate,
···
 	.is_enabled = mvebu_uart_clock_is_enabled,
 	.save_context = mvebu_uart_clock_save_context,
 	.restore_context = mvebu_uart_clock_restore_context,
-	.round_rate = mvebu_uart_clock_round_rate,
+	.determine_rate = mvebu_uart_clock_determine_rate,
 	.set_rate = mvebu_uart_clock_set_rate,
 	.recalc_rate = mvebu_uart_clock_recalc_rate,
 };

drivers/tty/serial/qcom_geni_serial.c

···
 // SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
+/*
+ * Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
 
 /* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
 #define __DISABLE_TRACE_MMIO__
···
 #define STALE_TIMEOUT			16
 #define DEFAULT_BITS_PER_CHAR		10
 #define GENI_UART_CONS_PORTS		1
-#define GENI_UART_PORTS			3
 #define DEF_FIFO_DEPTH_WORDS		16
 #define DEF_TX_WM			2
 #define DEF_FIFO_WIDTH_BITS		32
···
 {
 	return container_of(uport, struct qcom_geni_serial_port, uport);
 }
-
-static struct qcom_geni_serial_port qcom_geni_uart_ports[GENI_UART_PORTS] = {
-	[0] = {
-		.uport = {
-			.iotype = UPIO_MEM,
-			.ops = &qcom_geni_uart_pops,
-			.flags = UPF_BOOT_AUTOCONF,
-			.line = 0,
-		},
-	},
-	[1] = {
-		.uport = {
-			.iotype = UPIO_MEM,
-			.ops = &qcom_geni_uart_pops,
-			.flags = UPF_BOOT_AUTOCONF,
-			.line = 1,
-		},
-	},
-	[2] = {
-		.uport = {
-			.iotype = UPIO_MEM,
-			.ops = &qcom_geni_uart_pops,
-			.flags = UPF_BOOT_AUTOCONF,
-			.line = 2,
-		},
-	},
-};
 
 static struct qcom_geni_serial_port qcom_geni_console_port = {
 	.uport = {
···
 	return "MSM";
 }
 
-static struct qcom_geni_serial_port *get_port_from_line(int line, bool console)
+static struct qcom_geni_serial_port *get_port_from_line(int line, bool console, struct device *dev)
 {
 	struct qcom_geni_serial_port *port;
-	int nr_ports = console ? GENI_UART_CONS_PORTS : GENI_UART_PORTS;
+	int nr_ports = console ? GENI_UART_CONS_PORTS : CONFIG_SERIAL_QCOM_GENI_UART_PORTS;
 
 	if (console) {
 		if (line < 0 || line >= nr_ports)
···
 		int max_alias_num = of_alias_get_highest_id("serial");
 
 		if (line < 0 || line >= nr_ports)
-			line = ida_alloc_range(&port_ida, max_alias_num + 1, nr_ports, GFP_KERNEL);
+			line = ida_alloc_range(&port_ida, max_alias_num + 1,
+					       nr_ports - 1, GFP_KERNEL);
 		else
-			line = ida_alloc_range(&port_ida, line, nr_ports, GFP_KERNEL);
+			line = ida_alloc_range(&port_ida, line,
+					       nr_ports - 1, GFP_KERNEL);
 
 		if (line < 0)
 			return ERR_PTR(-ENXIO);
 
-		port = &qcom_geni_uart_ports[line];
+		port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+		if (!port)
+			return ERR_PTR(-ENOMEM);
+
+		port->uport.iotype = UPIO_MEM;
+		port->uport.ops = &qcom_geni_uart_pops;
+		port->uport.flags = UPF_BOOT_AUTOCONF;
+		port->uport.line = line;
 	}
 	return port;
 }
···
 
 	WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS);
 
-	port = get_port_from_line(co->index, true);
+	port = get_port_from_line(co->index, true, NULL);
 	if (IS_ERR(port))
 		return;
 
···
 	return 0;
 }
 
-static unsigned long find_clk_rate_in_tol(struct clk *clk, unsigned int desired_clk,
-			unsigned int *clk_div, unsigned int percent_tol)
-{
-	unsigned long freq;
-	unsigned long div, maxdiv;
-	u64 mult;
-	unsigned long offset, abs_tol, achieved;
-
-	abs_tol = div_u64((u64)desired_clk * percent_tol, 100);
-	maxdiv = CLK_DIV_MSK >> CLK_DIV_SHFT;
-	div = 1;
-	while (div <= maxdiv) {
-		mult = (u64)div * desired_clk;
-		if (mult != (unsigned long)mult)
-			break;
-
-		offset = div * abs_tol;
-		freq = clk_round_rate(clk, mult - offset);
-
-		/* Can only get lower if we're done */
-		if (freq < mult - offset)
-			break;
-
-		/*
-		 * Re-calculate div in case rounding skipped rates but we
-		 * ended up at a good one, then check for a match.
-		 */
-		div = DIV_ROUND_CLOSEST(freq, desired_clk);
-		achieved = DIV_ROUND_CLOSEST(freq, div);
-		if (achieved <= desired_clk + abs_tol &&
-		    achieved >= desired_clk - abs_tol) {
-			*clk_div = div;
-			return freq;
-		}
-
-		div = DIV_ROUND_UP(freq, desired_clk);
-	}
-
-	return 0;
-}
-
-static unsigned long get_clk_div_rate(struct clk *clk, unsigned int baud,
-			unsigned int sampling_rate, unsigned int *clk_div)
-{
-	unsigned long ser_clk;
-	unsigned long desired_clk;
-
-	desired_clk = baud * sampling_rate;
-	if (!desired_clk)
-		return 0;
-
-	/*
-	 * try to find a clock rate within 2% tolerance, then within 5%
-	 */
-	ser_clk = find_clk_rate_in_tol(clk, desired_clk, clk_div, 2);
-	if (!ser_clk)
-		ser_clk = find_clk_rate_in_tol(clk, desired_clk, clk_div, 5);
-
-	return ser_clk;
-}
-
 static int geni_serial_set_rate(struct uart_port *uport, unsigned int baud)
 {
 	struct qcom_geni_serial_port *port = to_dev_port(uport);
 	unsigned long clk_rate;
-	unsigned int avg_bw_core;
+	unsigned int avg_bw_core, clk_idx;
 	unsigned int clk_div;
 	u32 ver, sampling_rate;
 	u32 ser_clk_cfg;
+	int ret;
 
 	sampling_rate = UART_OVERSAMPLING;
 	/* Sampling rate is halved for IP versions >= 2.5 */
···
 	if (ver >= QUP_SE_VERSION_2_5)
 		sampling_rate /= 2;
 
-	clk_rate = get_clk_div_rate(port->se.clk, baud,
-		sampling_rate, &clk_div);
-	if (!clk_rate) {
-		dev_err(port->se.dev,
-			"Couldn't find suitable clock rate for %u\n",
-			baud * sampling_rate);
+	ret = geni_se_clk_freq_match(&port->se, baud * sampling_rate, &clk_idx, &clk_rate, false);
+	if (ret) {
+		dev_err(port->se.dev, "Failed to find src clk for baud rate: %d ret: %d\n",
+			baud, ret);
+		return ret;
+	}
+
+	clk_div = DIV_ROUND_UP(clk_rate, baud * sampling_rate);
+	/* Check if calculated divider exceeds maximum allowed value */
+	if (clk_div > (CLK_DIV_MSK >> CLK_DIV_SHFT)) {
+		dev_err(port->se.dev, "Calculated clock divider %u exceeds maximum\n", clk_div);
 		return -EINVAL;
 	}
 
-	dev_dbg(port->se.dev, "desired_rate = %u, clk_rate = %lu, clk_div = %u\n",
-			baud * sampling_rate, clk_rate, clk_div);
+	dev_dbg(port->se.dev, "desired_rate = %u, clk_rate = %lu, clk_div = %u\n, clk_idx = %u\n",
+		baud * sampling_rate, clk_rate, clk_div, clk_idx);
 
 	uport->uartclk = clk_rate;
 	port->clk_rate = clk_rate;
···
 
 	writel(ser_clk_cfg, uport->membase + GENI_SER_M_CLK_CFG);
 	writel(ser_clk_cfg, uport->membase + GENI_SER_S_CLK_CFG);
+	/* Configure clock selection register with the selected clock index */
+	writel(clk_idx & CLK_SEL_MSK, uport->membase + SE_GENI_CLK_SEL);
 	return 0;
 }
 
···
 	if (co->index >= GENI_UART_CONS_PORTS  || co->index < 0)
 		return -ENXIO;
 
-	port = get_port_from_line(co->index, true);
+	port = get_port_from_line(co->index, true, NULL);
 	if (IS_ERR(port)) {
 		pr_err("Invalid line %d\n", co->index);
 		return PTR_ERR(port);
···
 	.owner = THIS_MODULE,
 	.driver_name = "qcom_geni_uart",
 	.dev_name = "ttyHS",
-	.nr =  GENI_UART_PORTS,
+	.nr = CONFIG_SERIAL_QCOM_GENI_UART_PORTS,
 };
 
 static int geni_serial_resources_on(struct uart_port *uport)
···
 			line = of_alias_get_id(pdev->dev.of_node, "hsuart");
 	}
 
-	port = get_port_from_line(line, data->console);
+	port = get_port_from_line(line, data->console, &pdev->dev);
 	if (IS_ERR(port)) {
 		dev_err(&pdev->dev, "Invalid line %d\n", line);
 		return PTR_ERR(port);

drivers/tty/serial/sc16is7xx.c

···
 {
 	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 	unsigned int lsr = 0, bytes_read, i;
-	bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC) ? true : false;
+	bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC);
 	u8 ch, flag;
 
 	if (unlikely(rxlen >= sizeof(one->buf))) {

drivers/tty/serial/serial_core.c

···
 static void
 uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
 {
-	unsigned long flags;
 	unsigned int old;
 
-	uart_port_lock_irqsave(port, &flags);
+	guard(uart_port_lock_irqsave)(port);
 	old = port->mctrl;
 	port->mctrl = (old & ~clear) | set;
 	if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED))
 		port->ops->set_mctrl(port, port->mctrl);
-	uart_port_unlock_irqrestore(port, flags);
 }
 
 #define uart_set_mctrl(port, set)	uart_update_mctrl(port, set, 0)
···
 	/*
 	 * Set modem status enables based on termios cflag
 	 */
-	uart_port_lock_irq(uport);
+	guard(uart_port_lock_irq)(uport);
 	if (termios->c_cflag & CRTSCTS)
 		uport->status |= UPSTAT_CTS_ENABLE;
 	else
···
 		else
 			__uart_start(state);
 	}
-	uart_port_unlock_irq(uport);
 }
 
 static int uart_alloc_xmit_buf(struct tty_port *port)
···
 {
 	struct uart_state *state = tty->driver_data;
 	struct uart_port *port;
-	unsigned long flags;
 
 	port = uart_port_ref(state);
 	if (!port)
···
 	if (port->ops->send_xchar)
 		port->ops->send_xchar(port, ch);
 	else {
-		uart_port_lock_irqsave(port, &flags);
+		guard(uart_port_lock_irqsave)(port);
 		port->x_char = ch;
 		if (ch)
 			port->ops->start_tx(port);
-		uart_port_unlock_irqrestore(port, flags);
 	}
 	uart_port_deref(port);
 }
···
 	struct uart_state *state = tty->driver_data;
 	struct tty_port *port = &state->port;
 	struct uart_port *uport;
-	int result;
 
 	guard(mutex)(&port->mutex);
 
···
 	if (!uport || tty_io_error(tty))
 		return -EIO;
 
-	uart_port_lock_irq(uport);
-	result = uport->mctrl;
-	result |= uport->ops->get_mctrl(uport);
-	uart_port_unlock_irq(uport);
+	guard(uart_port_lock_irq)(uport);
 
-	return result;
+	return uport->mctrl | uport->ops->get_mctrl(uport);
 }
 
 static int
···
 	uport = uart_port_ref(state);
 	if (!uport)
 		return -EIO;
-	uart_port_lock_irq(uport);
-	memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
-	uart_enable_ms(uport);
-	uart_port_unlock_irq(uport);
+	scoped_guard(uart_port_lock_irq, uport) {
+		memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
+		uart_enable_ms(uport);
+	}
 
 	add_wait_queue(&port->delta_msr_wait, &wait);
 	for (;;) {
-		uart_port_lock_irq(uport);
-		memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
-		uart_port_unlock_irq(uport);
+		scoped_guard(uart_port_lock_irq, uport)
+			memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
 
 		set_current_state(TASK_INTERRUPTIBLE);
 
···
 static int uart_rs485_config(struct uart_port *port)
 {
 	struct serial_rs485 *rs485 = &port->rs485;
-	unsigned long flags;
 	int ret;
 
 	if (!(rs485->flags & SER_RS485_ENABLED))
···
 	uart_set_rs485_termination(port, rs485);
 	uart_set_rs485_rx_during_tx(port, rs485);
 
-	uart_port_lock_irqsave(port, &flags);
-	ret = port->rs485_config(port, NULL, rs485);
-	uart_port_unlock_irqrestore(port, flags);
+	scoped_guard(uart_port_lock_irqsave, port)
+		ret = port->rs485_config(port, NULL, rs485);
 	if (ret) {
 		memset(rs485, 0, sizeof(*rs485));
 		/* unset GPIOs */
···
 static int uart_get_rs485_config(struct uart_port *port,
 			 struct serial_rs485 __user *rs485)
 {
-	unsigned long flags;
 	struct serial_rs485 aux;
 
-	uart_port_lock_irqsave(port, &flags);
-	aux = port->rs485;
-	uart_port_unlock_irqrestore(port, flags);
+	scoped_guard(uart_port_lock_irqsave, port)
+		aux = port->rs485;
 
 	if (copy_to_user(rs485, &aux, sizeof(aux)))
 		return -EFAULT;
···
 {
 	struct serial_rs485 rs485;
 	int ret;
-	unsigned long flags;
 
 	if (!(port->rs485_supported.flags & SER_RS485_ENABLED))
 		return -ENOTTY;
···
 	uart_set_rs485_termination(port, &rs485);
 	uart_set_rs485_rx_during_tx(port, &rs485);
 
-	uart_port_lock_irqsave(port, &flags);
-	ret = port->rs485_config(port, &tty->termios, &rs485);
-	if (!ret) {
-		port->rs485 = rs485;
+	scoped_guard(uart_port_lock_irqsave, port) {
+		ret = port->rs485_config(port, &tty->termios, &rs485);
+		if (!ret) {
+			port->rs485 = rs485;
 
-		/* Reset RTS and other mctrl lines when disabling RS485 */
-		if (!(rs485.flags & SER_RS485_ENABLED))
-			port->ops->set_mctrl(port, port->mctrl);
+			/* Reset RTS and other mctrl lines when disabling RS485 */
+			if (!(rs485.flags & SER_RS485_ENABLED))
+				port->ops->set_mctrl(port, port->mctrl);
+		}
 	}
-	uart_port_unlock_irqrestore(port, flags);
 	if (ret) {
 		/* restore old GPIO settings */
 		gpiod_set_value_cansleep(port->rs485_term_gpio,
···
 static int uart_get_iso7816_config(struct uart_port *port,
 				   struct serial_iso7816 __user *iso7816)
 {
-	unsigned long flags;
 	struct serial_iso7816 aux;
 
 	if (!port->iso7816_config)
 		return -ENOTTY;
 
-	uart_port_lock_irqsave(port, &flags);
-	aux = port->iso7816;
-	uart_port_unlock_irqrestore(port, flags);
+	scoped_guard(uart_port_lock_irqsave, port)
+		aux = port->iso7816;
 
 	if (copy_to_user(iso7816, &aux, sizeof(aux)))
 		return -EFAULT;
···
 				   struct serial_iso7816 __user *iso7816_user)
 {
 	struct serial_iso7816 iso7816;
-	int i, ret;
-	unsigned long flags;
+	int i;
 
 	if (!port->iso7816_config)
 		return -ENOTTY;
···
 		if (iso7816.reserved[i])
 			return -EINVAL;
 
-	uart_port_lock_irqsave(port, &flags);
-	ret = port->iso7816_config(port, &iso7816);
-	uart_port_unlock_irqrestore(port, flags);
-	if (ret)
-		return ret;
+	scoped_guard(uart_port_lock_irqsave, port) {
+		int ret = port->iso7816_config(port, &iso7816);
+		if (ret)
+			return ret;
+	}
 
 	if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
 		return -EFAULT;
···
 	if (WARN(!uport, "detached port still initialized!\n"))
 		return;
 
-	uart_port_lock_irq(uport);
-	uport->ops->stop_rx(uport);
-	uart_port_unlock_irq(uport);
+	scoped_guard(uart_port_lock_irq, uport)
+		uport->ops->stop_rx(uport);
 
 	serial_base_port_shutdown(uport);
 	uart_port_shutdown(port);
···
 		pm_state = state->pm_state;
 		if (pm_state != UART_PM_STATE_ON)
 			uart_change_pm(state, UART_PM_STATE_ON);
-		uart_port_lock_irq(uport);
-		status = uport->ops->get_mctrl(uport);
-		uart_port_unlock_irq(uport);
+		scoped_guard(uart_port_lock_irq, uport)
+			status = uport->ops->get_mctrl(uport);
 		if (pm_state != UART_PM_STATE_ON)
 			uart_change_pm(state, pm_state);
 
···
 	 */
 	if (!console_suspend_enabled && uart_console(uport)) {
 		if (uport->ops->start_rx) {
-			uart_port_lock_irq(uport);
+			guard(uart_port_lock_irq)(uport);
 			uport->ops->stop_rx(uport);
-			uart_port_unlock_irq(uport);
 		}
 		device_set_awake_path(uport->dev);
 		return 0;
···
 		tty_port_set_suspended(port, true);
 		tty_port_set_initialized(port, false);
 
-		uart_port_lock_irq(uport);
-		ops->stop_tx(uport);
-		if (!(uport->rs485.flags & SER_RS485_ENABLED))
-			ops->set_mctrl(uport, 0);
-		/* save mctrl so it can be restored on resume */
-		mctrl = uport->mctrl;
-		uport->mctrl = 0;
-		ops->stop_rx(uport);
-		uart_port_unlock_irq(uport);
+		scoped_guard(uart_port_lock_irq, uport) {
+			ops->stop_tx(uport);
+			if (!(uport->rs485.flags & SER_RS485_ENABLED))
+				ops->set_mctrl(uport, 0);
+			/* save mctrl so it can be restored on resume */
+			mctrl = uport->mctrl;
+			uport->mctrl = 0;
+			ops->stop_rx(uport);
+		}
 
 		/*
 		 * Wait for the transmitter to empty.
···
 			uart_change_pm(state, UART_PM_STATE_ON);
 		uport->ops->set_termios(uport, &termios, NULL);
 		if (!console_suspend_enabled && uport->ops->start_rx) {
-			uart_port_lock_irq(uport);
+			guard(uart_port_lock_irq)(uport);
 			uport->ops->start_rx(uport);
-			uart_port_unlock_irq(uport);
 		}
 		if (console_suspend_enabled)
 			console_resume(uport->cons);
···
 		int ret;
 
 		uart_change_pm(state, UART_PM_STATE_ON);
-		uart_port_lock_irq(uport);
-		if (!(uport->rs485.flags & SER_RS485_ENABLED))
-			ops->set_mctrl(uport, 0);
-		uart_port_unlock_irq(uport);
+		scoped_guard(uart_port_lock_irq, uport)
+			if (!(uport->rs485.flags & SER_RS485_ENABLED))
+				ops->set_mctrl(uport, 0);
 		if (console_suspend_enabled || !uart_console(uport)) {
 			/* Protected by port mutex for now */
 			struct tty_struct *tty = port->tty;
···
 				if (tty)
 					uart_change_line_settings(tty, state, NULL);
 				uart_rs485_config(uport);
-				uart_port_lock_irq(uport);
-				if (!(uport->rs485.flags & SER_RS485_ENABLED))
-					ops->set_mctrl(uport, uport->mctrl);
-				ops->start_tx(uport);
-				uart_port_unlock_irq(uport);
+				scoped_guard(uart_port_lock_irq, uport) {
+					if (!(uport->rs485.flags & SER_RS485_ENABLED))
+						ops->set_mctrl(uport, uport->mctrl);
+					ops->start_tx(uport);
+				}
 				tty_port_set_initialized(port, true);
 			} else {
 				/*
···
 	}
 
 	if (port->type != PORT_UNKNOWN) {
-		unsigned long flags;
-
 		uart_report_port(drv, port);
 
 		/* Synchronize with possible boot console. */
···
 		 * keep the DTR setting that is set in uart_set_options()
 		 * We probably don't need a spinlock around this, but
 		 */
-		uart_port_lock_irqsave(port, &flags);
-		port->mctrl &= TIOCM_DTR;
-		if (!(port->rs485.flags & SER_RS485_ENABLED))
-			port->ops->set_mctrl(port, port->mctrl);
-		uart_port_unlock_irqrestore(port, flags);
+		scoped_guard(uart_port_lock_irqsave, port) {
+			port->mctrl &= TIOCM_DTR;
+			if (!(port->rs485.flags & SER_RS485_ENABLED))
+				port->ops->set_mctrl(port, port->mctrl);
+		}
 
 		uart_rs485_config(port);
 

drivers/tty/sysrq.c

···
 	 * Behaves like do_proc_dointvec as t does not have min nor max.
 	 */
 	ret = proc_dointvec_minmax(&t, write, buffer, lenp, ppos);
-
-	if (ret || !write)
+	if (ret)
 		return ret;
 
 	if (write)

drivers/tty/tty_port.c

···
 
 static void tty_port_default_wakeup(struct tty_port *port)
 {
-	struct tty_struct *tty = tty_port_tty_get(port);
-
-	if (tty) {
-		tty_wakeup(tty);
-		tty_kref_put(tty);
-	}
+	scoped_guard(tty_port_tty, port)
+		tty_wakeup(scoped_tty());
 }
 
 const struct tty_port_client_operations tty_port_default_client_ops = {
···
 int tty_port_alloc_xmit_buf(struct tty_port *port)
 {
 	/* We may sleep in get_zeroed_page() */
-	mutex_lock(&port->buf_mutex);
-	if (port->xmit_buf == NULL) {
-		port->xmit_buf = (u8 *)get_zeroed_page(GFP_KERNEL);
-		if (port->xmit_buf)
-			kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);
-	}
-	mutex_unlock(&port->buf_mutex);
+	guard(mutex)(&port->buf_mutex);
+
+	if (port->xmit_buf)
+		return 0;
+
+	port->xmit_buf = (u8 *)get_zeroed_page(GFP_KERNEL);
 	if (port->xmit_buf == NULL)
 		return -ENOMEM;
+
+	kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);
+
 	return 0;
 }
 EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
 
 void tty_port_free_xmit_buf(struct tty_port *port)
 {
-	mutex_lock(&port->buf_mutex);
+	guard(mutex)(&port->buf_mutex);
 	free_page((unsigned long)port->xmit_buf);
 	port->xmit_buf = NULL;
 	INIT_KFIFO(port->xmit_fifo);
-	mutex_unlock(&port->buf_mutex);
 }
 EXPORT_SYMBOL(tty_port_free_xmit_buf);
 
···
  */
 struct tty_struct *tty_port_tty_get(struct tty_port *port)
 {
-	unsigned long flags;
-	struct tty_struct *tty;
-
-	spin_lock_irqsave(&port->lock, flags);
-	tty = tty_kref_get(port->tty);
-	spin_unlock_irqrestore(&port->lock, flags);
-	return tty;
+	guard(spinlock_irqsave)(&port->lock);
+	return tty_kref_get(port->tty);
 }
 EXPORT_SYMBOL(tty_port_tty_get);
 
···
  */
 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&port->lock, flags);
+	guard(spinlock_irqsave)(&port->lock);
 	tty_kref_put(port->tty);
 	port->tty = tty_kref_get(tty);
-	spin_unlock_irqrestore(&port->lock, flags);
 }
 EXPORT_SYMBOL(tty_port_tty_set);
 
···
  */
 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
 {
-	mutex_lock(&port->mutex);
+	guard(mutex)(&port->mutex);
+
 	if (port->console)
-		goto out;
+		return;
 
-	if (tty_port_initialized(port)) {
-		tty_port_set_initialized(port, false);
-		/*
-		 * Drop DTR/RTS if HUPCL is set. This causes any attached
-		 * modem to hang up the line.
-		 */
-		if (tty && C_HUPCL(tty))
-			tty_port_lower_dtr_rts(port);
+	if (!tty_port_initialized(port))
+		return;
 
-		if (port->ops->shutdown)
-			port->ops->shutdown(port);
-	}
-out:
-	mutex_unlock(&port->mutex);
+	tty_port_set_initialized(port, false);
+	/*
+	 * Drop DTR/RTS if HUPCL is set. This causes any attached
+	 * modem to hang up the line.
+	 */
+	if (tty && C_HUPCL(tty))
+		tty_port_lower_dtr_rts(port);
+
+	if (port->ops->shutdown)
+		port->ops->shutdown(port);
 }
 
 /**
···
 void tty_port_hangup(struct tty_port *port)
 {
 	struct tty_struct *tty;
-	unsigned long flags;
 
-	spin_lock_irqsave(&port->lock, flags);
-	port->count = 0;
-	tty = port->tty;
-	if (tty)
-		set_bit(TTY_IO_ERROR, &tty->flags);
-	port->tty = NULL;
-	spin_unlock_irqrestore(&port->lock, flags);
+	scoped_guard(spinlock_irqsave, &port->lock) {
+		port->count = 0;
+		tty = port->tty;
+		if (tty)
+			set_bit(TTY_IO_ERROR, &tty->flags);
+		port->tty = NULL;
+	}
+
 	tty_port_set_active(port, false);
 	tty_port_shutdown(port, tty);
 	tty_kref_put(tty);
···
 
 void __tty_port_tty_hangup(struct tty_port *port, bool check_clocal, bool async)
 {
-	struct tty_struct *tty = tty_port_tty_get(port);
+	scoped_guard(tty_port_tty, port) {
+		struct tty_struct *tty = scoped_tty();
 
-	if (tty && (!check_clocal || !C_CLOCAL(tty))) {
-		if (async)
-			tty_hangup(tty);
-		else
-			tty_vhangup(tty);
+		if (!check_clocal || !C_CLOCAL(tty)) {
+			if (async)
+				tty_hangup(tty);
+			else
+				tty_vhangup(tty);
+		}
 	}
-	tty_kref_put(tty);
 }
 EXPORT_SYMBOL_GPL(__tty_port_tty_hangup);
 
···
 				struct tty_struct *tty, struct file *filp)
 {
 	int do_clocal = 0, retval;
-	unsigned long flags;
 	DEFINE_WAIT(wait);
 
 	/* if non-blocking mode is set we can pass directly to open unless
···
 	retval = 0;
 
 	/* The port lock protects the port counts */
-	spin_lock_irqsave(&port->lock, flags);
-	port->count--;
-	port->blocked_open++;
-	spin_unlock_irqrestore(&port->lock, flags);
+	scoped_guard(spinlock_irqsave, &port->lock) {
+		port->count--;
+		port->blocked_open++;
+	}
 
 	while (1) {
 		/* Indicate we are open */
···
 	/* Update counts. A parallel hangup will have set count to zero and
 	 * we must not mess that up further.
 	 */
-	spin_lock_irqsave(&port->lock, flags);
-	if (!tty_hung_up_p(filp))
-		port->count++;
-	port->blocked_open--;
-	spin_unlock_irqrestore(&port->lock, flags);
+	scoped_guard(spinlock_irqsave, &port->lock) {
+		if (!tty_hung_up_p(filp))
+			port->count++;
+		port->blocked_open--;
+	}
 	if (retval == 0)
 		tty_port_set_active(port, true);
 	return retval;
···
 int tty_port_close_start(struct tty_port *port,
 				struct tty_struct *tty, struct file *filp)
 {
-	unsigned long flags;
-
 	if (tty_hung_up_p(filp))
 		return 0;
 
-	spin_lock_irqsave(&port->lock, flags);
-	if (tty->count == 1 && port->count != 1) {
-		tty_warn(tty, "%s: tty->count = 1 port count = %d\n", __func__,
-			 port->count);
-		port->count = 1;
-	}
-	if (--port->count < 0) {
-		tty_warn(tty, "%s: bad port count (%d)\n", __func__,
-			 port->count);
-		port->count = 0;
-	}
+	scoped_guard(spinlock_irqsave, &port->lock) {
+		if (tty->count == 1 && port->count != 1) {
+			tty_warn(tty, "%s: tty->count = 1 port count = %d\n", __func__,
+				 port->count);
+			port->count = 1;
+		}
+		if (--port->count < 0) {
+			tty_warn(tty, "%s: bad port count (%d)\n", __func__,
+				 port->count);
+			port->count = 0;
+		}
 
-	if (port->count) {
-		spin_unlock_irqrestore(&port->lock, flags);
-		return 0;
+		if (port->count)
+			return 0;
 	}
-	spin_unlock_irqrestore(&port->lock, flags);
 
 	tty->closing = 1;
 
···
 int tty_port_open(struct tty_port *port, struct tty_struct *tty,
 							struct file *filp)
 {
-	spin_lock_irq(&port->lock);
-	++port->count;
-	spin_unlock_irq(&port->lock);
+	scoped_guard(spinlock_irq, &port->lock)
+		++port->count;
 	tty_port_tty_set(port, tty);
 
 	/*
···
 	 * port mutex.
 	 */
 
-	mutex_lock(&port->mutex);
-
-	if (!tty_port_initialized(port)) {
+	scoped_guard(mutex, &port->mutex) {
+		if (tty_port_initialized(port))
+			break;
 		clear_bit(TTY_IO_ERROR, &tty->flags);
 		if (port->ops->activate) {
 			int retval = port->ops->activate(port, tty);
-
-			if (retval) {
-				mutex_unlock(&port->mutex);
+			if (retval)
 				return retval;
-			}
 		}
 		tty_port_set_initialized(port, true);
 	}
-	mutex_unlock(&port->mutex);
 	return tty_port_block_til_ready(port, tty, filp);
 }
 EXPORT_SYMBOL(tty_port_open);

drivers/tty/vt/consolemap.c

···
 		inbuf[i] = UNI_DIRECT_BASE | ch;
 	}
 
-	console_lock();
+	guard(console_lock)();
 	memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
 	update_user_maps();
-	console_unlock();
+
 	return 0;
 }
 
···
 	unsigned short *p = translations[USER_MAP];
 	unsigned char outbuf[E_TABSZ];
 
-	console_lock();
-	for (i = 0; i < ARRAY_SIZE(outbuf); i++)
-	{
-		ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
-		outbuf[i] = (ch & ~0xff) ? 0 : ch;
-	}
-	console_unlock();
+	scoped_guard(console_lock)
+		for (i = 0; i < ARRAY_SIZE(outbuf); i++) {
+			ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
+			outbuf[i] = (ch & ~0xff) ? 0 : ch;
+		}
 
 	return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
 }
···
 	if (copy_from_user(inbuf, arg, sizeof(inbuf)))
 		return -EFAULT;
 
-	console_lock();
+	guard(console_lock)();
 	memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
 	update_user_maps();
-	console_unlock();
+
 	return 0;
 }
 
···
 {
 	unsigned short outbuf[E_TABSZ];
 
-	console_lock();
-	memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
-	console_unlock();
+	scoped_guard(console_lock)
+		memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
 
 	return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
 }
···
 
 int con_clear_unimap(struct vc_data *vc)
 {
-	int ret;
-	console_lock();
-	ret = con_do_clear_unimap(vc);
-	console_unlock();
-	return ret;
+	guard(console_lock)();
+	return con_do_clear_unimap(vc);
 }
 
 static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc,
···
 
 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 {
-	int err = 0, err1;
 	struct uni_pagedict *dict;
-	struct unipair *unilist, *plist;
+	struct unipair *plist;
+	int err = 0;
 
 	if (!ct)
 		return 0;
 
-	unilist = vmemdup_array_user(list, ct, sizeof(*unilist));
+	struct unipair *unilist __free(kvfree) = vmemdup_array_user(list, ct, sizeof(*unilist));
 	if (IS_ERR(unilist))
 		return PTR_ERR(unilist);
 
-	console_lock();
+	guard(console_lock)();
 
 	/* Save original vc_unipagdir_loc in case we allocate a new one */
 	dict = *vc->uni_pagedict_loc;
-	if (!dict) {
-		err = -EINVAL;
-		goto out_unlock;
-	}
+	if (!dict)
+		return -EINVAL;
 
 	if (dict->refcount > 1) {
 		dict = con_unshare_unimap(vc, dict);
-		if (IS_ERR(dict)) {
-			err = PTR_ERR(dict);
-			goto out_unlock;
-		}
+		if (IS_ERR(dict))
+			return PTR_ERR(dict);
 	} else if (dict == dflt) {
 		dflt = NULL;
 	}
···
 	 * Insert user specified unicode pairs into new table.
 	 */
 	for (plist = unilist; ct; ct--, plist++) {
-		err1 = con_insert_unipair(dict, plist->unicode, plist->fontpos);
+		int err1 = con_insert_unipair(dict, plist->unicode, plist->fontpos);
 		if (err1)
 			err = err1;
 	}
···
 	 * Merge with fontmaps of any other virtual consoles.
 	 */
 	if (con_unify_unimap(vc, dict))
-		goto out_unlock;
+		return err;
 
 	for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++)
 		set_inverse_transl(vc, dict, m);
 	set_inverse_trans_unicode(dict);
 
-out_unlock:
-	console_unlock();
-	kvfree(unilist);
 	return err;
 }
 
···
 {
 	ushort ect;
 	struct uni_pagedict *dict;
-	struct unipair *unilist;
 	unsigned int d, r, g;
-	int ret = 0;
 
-	unilist = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL);
+	struct unipair *unilist __free(kvfree) = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL);
 	if (!unilist)
 		return -ENOMEM;
 
-	console_lock();
+	scoped_guard(console_lock) {
+		ect = 0;
+		dict = *vc->uni_pagedict_loc;
+		if (!dict)
+			break;
 
-	ect = 0;
-	dict = *vc->uni_pagedict_loc;
-	if (!dict)
-		goto unlock;
-
-	for (d = 0; d < UNI_DIRS; d++) {
-		u16 **dir = dict->uni_pgdir[d];
-		if (!dir)
-			continue;
-
-		for (r = 0; r < UNI_DIR_ROWS; r++) {
-			u16 *row = dir[r];
-			if (!row)
+		for (d = 0; d < UNI_DIRS; d++) {
+			u16 **dir = dict->uni_pgdir[d];
+			if (!dir)
 				continue;
 
-			for (g = 0; g < UNI_ROW_GLYPHS; g++, row++) {
-				if (*row >= MAX_GLYPH)
+			for (r = 0; r < UNI_DIR_ROWS; r++) {
+				u16 *row = dir[r];
+				if (!row)
 					continue;
-				if (ect < ct) {
-					unilist[ect].unicode = UNI(d, r, g);
-					unilist[ect].fontpos = *row;
+
+				for (g = 0; g < UNI_ROW_GLYPHS; g++, row++) {
+					if (*row >= MAX_GLYPH)
+						continue;
+					if (ect < ct) {
+						unilist[ect].unicode = UNI(d, r, g);
+						unilist[ect].fontpos = *row;
+					}
+					ect++;
 				}
-				ect++;
 			}
 		}
 	}
-unlock:
-	console_unlock();
+
 	if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist)))
-		ret = -EFAULT;
+		return -EFAULT;
 	if (put_user(ect, uct))
-		ret = -EFAULT;
-	kvfree(unilist);
-	return ret ? ret : (ect <= ct) ? 0 : -ENOMEM;
+		return -EFAULT;
+	if (ect > ct)
+		return -ENOMEM;
+
+	return 0;
 }
 
 /*

drivers/tty/vt/selection.c

···
 	if (copy_from_user(tmplut, lut, sizeof(inwordLut)))
 		return -EFAULT;
 
-	console_lock();
+	guard(console_lock)();
 	memcpy(inwordLut, tmplut, sizeof(inwordLut));
-	console_unlock();
 
 	return 0;
 }
···
 
 int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
 {
-	int ret;
-
-	mutex_lock(&vc_sel.lock);
-	console_lock();
-	ret = vc_selection(vc_cons[fg_console].d, v, tty);
-	console_unlock();
-	mutex_unlock(&vc_sel.lock);
-
-	return ret;
+	guard(mutex)(&vc_sel.lock);
+	guard(console_lock)();
+	return vc_selection(vc_cons[fg_console].d, v, tty);
 }
 EXPORT_SYMBOL_GPL(set_selection_kernel);
 
···
 	const char *bps = bp ? bracketed_paste_start : NULL;
 	const char *bpe = bp ? bracketed_paste_end : NULL;
 
-	console_lock();
-	poke_blanked_console();
-	console_unlock();
+	scoped_guard(console_lock)
+		poke_blanked_console();
 
 	ld = tty_ldisc_ref_wait(tty);
 	if (!ld)

drivers/tty/vt/vc_screen.c

···
 #define HEADER_SIZE	4u
 #define CON_BUF_SIZE (IS_ENABLED(CONFIG_BASE_SMALL) ? 256 : PAGE_SIZE)
 
+DEFINE_FREE(free_page_ptr, void *, if (_T) free_page((unsigned long)_T));
+
 /*
  * Our minor space:
  *
···
 #define console(inode)		(iminor(inode) & 63)
 #define use_unicode(inode)	(iminor(inode) & 64)
 #define use_attributes(inode)	(iminor(inode) & 128)
-
 
 struct vcs_poll_data {
 	struct notifier_block notifier;
···
 	struct vc_data *vc;
 	int size;
 
-	console_lock();
-	vc = vcs_vc(inode, NULL);
-	if (!vc) {
-		console_unlock();
-		return -ENXIO;
-	}
+	scoped_guard(console_lock) {
+		vc = vcs_vc(inode, NULL);
+		if (!vc)
+			return -ENXIO;
 
-	size = vcs_size(vc, use_attributes(inode), use_unicode(inode));
-	console_unlock();
+		size = vcs_size(vc, use_attributes(inode), use_unicode(inode));
+	}
 	if (size < 0)
 		return size;
 	return fixed_size_llseek(file, offset, orig, size);
···
 	struct vcs_poll_data *poll;
 	unsigned int read;
 	ssize_t ret;
-	char *con_buf;
 	loff_t pos;
 	bool viewed, attr, uni_mode;
 
-	con_buf = (char *) __get_free_page(GFP_KERNEL);
+	char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL);
 	if (!con_buf)
 		return -ENOMEM;
 
···
 	/* Select the proper current console and verify
 	 * sanity of the situation under the console lock.
 	 */
-	console_lock();
+	guard(console_lock)();
 
 	uni_mode = use_unicode(inode);
 	attr = use_attributes(inode);
 
-	ret = -EINVAL;
 	if (pos < 0)
-		goto unlock_out;
+		return -EINVAL;
 	/* we enforce 32-bit alignment for pos and count in unicode mode */
 	if (uni_mode && (pos | count) & 3)
-		goto unlock_out;
+		return -EINVAL;
 
 	poll = file->private_data;
 	if (count && poll)
···
 	}
 	*ppos += read;
 	if (read)
-		ret = read;
-unlock_out:
-	console_unlock();
-	free_page((unsigned long) con_buf);
+		return read;
+
 	return ret;
 }
 
···
 {
 	struct inode *inode = file_inode(file);
 	struct vc_data *vc;
-	char *con_buf;
 	u16 *org0, *org;
 	unsigned int written;
 	int size;
···
 	if (use_unicode(inode))
 		return -EOPNOTSUPP;
 
-	con_buf = (char *) __get_free_page(GFP_KERNEL);
+	char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL);
 	if (!con_buf)
 		return -ENOMEM;
 
···
 	/* Select the proper current console and verify
 	 * sanity of the situation under the console lock.
 	 */
-	console_lock();
+	guard(console_lock)();
 
 	attr = use_attributes(inode);
-	ret = -ENXIO;
 	vc = vcs_vc(inode, &viewed);
 	if (!vc)
-		goto unlock_out;
+		return -ENXIO;
 
 	size = vcs_size(vc, attr, false);
-	if (size < 0) {
-		ret = size;
-		goto unlock_out;
-	}
-	ret = -EINVAL;
+	if (size < 0)
+		return size;
 	if (pos < 0 || pos > size)
-		goto unlock_out;
+		return -EINVAL;
 	if (count > size - pos)
 		count = size - pos;
 	written = 0;
···
 				 */
 				if (written)
 					break;
-				ret = -EFAULT;
-				goto unlock_out;
+				return -EFAULT;
 			}
 		}
 
···
 		if (!vc) {
 			if (written)
 				break;
-			ret = -ENXIO;
-			goto unlock_out;
+			return -ENXIO;
 		}
 		size = vcs_size(vc, attr, false);
 		if (size < 0) {
 			if (written)
 				break;
-			ret = size;
-			goto unlock_out;
+			return size;
 		}
 		if (pos >= size)
 			break;
···
 	if (written)
 		vcs_scr_updated(vc);
 
-unlock_out:
-	console_unlock();
-	free_page((unsigned long) con_buf);
 	return ret;
 }
 
···
 	unsigned int currcons = console(inode);
 	bool attr = use_attributes(inode);
 	bool uni_mode = use_unicode(inode);
-	int ret = 0;
 
 	/* we currently don't support attributes in unicode mode */
 	if (attr && uni_mode)
 		return -EOPNOTSUPP;
 
-	console_lock();
-	if(currcons && !vc_cons_allocated(currcons-1))
-		ret = -ENXIO;
-	console_unlock();
-	return ret;
+	guard(console_lock)();
+
+	if (currcons && !vc_cons_allocated(currcons - 1))
+		return -ENXIO;
+
+	return 0;
 }
 
 static int vcs_release(struct inode *inode, struct file *file)

drivers/tty/vt/vt.c

···
 static int con_open(struct tty_struct *, struct file *);
 static void vc_init(struct vc_data *vc, int do_clear);
 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
+static void restore_cur(struct vc_data *vc);
 static void save_cur(struct vc_data *vc);
 static void reset_terminal(struct vc_data *vc, int do_clear);
 static void con_flush_chars(struct tty_struct *tty);
···
 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 {
 	struct vc_data *vc = tty->driver_data;
-	int ret;
 
-	console_lock();
-	ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
-	console_unlock();
-	return ret;
+	guard(console_lock)();
+	return vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
 }
 
 struct vc_data *vc_deallocate(unsigned int currcons)
···
 		vc_uniscr_set(vc, NULL);
 		kfree(vc->vc_screenbuf);
 		vc_cons[currcons].d = NULL;
+		if (vc->vc_saved_screen != NULL) {
+			kfree(vc->vc_saved_screen);
+			vc->vc_saved_screen = NULL;
+		}
 	}
 	return vc;
 }
···
 	return vc->vc_bracketed_paste;
 }
 
+/* console_lock is held */
+static void enter_alt_screen(struct vc_data *vc)
+{
+	unsigned int size = vc->vc_rows * vc->vc_cols * 2;
+
+	if (vc->vc_saved_screen != NULL)
+		return; /* Already inside an alt-screen */
+	vc->vc_saved_screen = kmemdup((u16 *)vc->vc_origin, size, GFP_KERNEL);
+	if (vc->vc_saved_screen == NULL)
+		return;
+	vc->vc_saved_rows = vc->vc_rows;
+	vc->vc_saved_cols = vc->vc_cols;
+	save_cur(vc);
+	/* clear entire screen */
+	csi_J(vc, CSI_J_FULL);
+}
+
+/* console_lock is held */
+static void leave_alt_screen(struct vc_data *vc)
+{
+	unsigned int rows = min(vc->vc_saved_rows, vc->vc_rows);
+	unsigned int cols = min(vc->vc_saved_cols, vc->vc_cols);
+	u16 *src, *dest;
+
+	if (vc->vc_saved_screen == NULL)
+		return; /* Not inside an alt-screen */
+	for (unsigned int r = 0; r < rows; r++) {
+		src = vc->vc_saved_screen + r * vc->vc_saved_cols;
+		dest = ((u16 *)vc->vc_origin) + r * vc->vc_cols;
+		memcpy(dest, src, 2 * cols);
+	}
+	restore_cur(vc);
+	/* Update the entire screen */
+	if (con_should_update(vc))
+		do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+	kfree(vc->vc_saved_screen);
+	vc->vc_saved_screen = NULL;
+}
+
 enum {
 	CSI_DEC_hl_CURSOR_KEYS	= 1,	/* CKM: cursor keys send ^[Ox/^[[x */
 	CSI_DEC_hl_132_COLUMNS	= 3,	/* COLM: 80/132 mode switch */
···
 	CSI_DEC_hl_MOUSE_X10	= 9,
 	CSI_DEC_hl_SHOW_CURSOR	= 25,	/* TCEM */
 	CSI_DEC_hl_MOUSE_VT200	= 1000,
+	CSI_DEC_hl_ALT_SCREEN	= 1049,
 	CSI_DEC_hl_BRACKETED_PASTE = 2004,
 };
 
···
 			break;
 		case CSI_DEC_hl_BRACKETED_PASTE:
 			vc->vc_bracketed_paste = on_off;
+			break;
+		case CSI_DEC_hl_ALT_SCREEN:
+			if (on_off)
+				enter_alt_screen(vc);
+			else
+				leave_alt_screen(vc);
 			break;
 		}
 }
···
 	vc->vc_decawm		= 1;
 	vc->vc_deccm		= global_cursor_default;
 	vc->vc_decim		= 0;
+
+	if (vc->vc_saved_screen != NULL) {
+		kfree(vc->vc_saved_screen);
+		vc->vc_saved_screen = NULL;
+		vc->vc_saved_rows = 0;
+		vc->vc_saved_cols = 0;
+	}
 
 	vt_reset_keyboard(vc->vc_num);
 
···
 	if (in_interrupt())
 		return count;
 
-	console_lock();
+	guard(console_lock)();
 	currcons = vc->vc_num;
 	if (!vc_cons_allocated(currcons)) {
 		/* could this happen? */
 		pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
-		console_unlock();
 		return 0;
 	}
 
···
 	con_flush(vc, &draw);
 	console_conditional_schedule();
 	notify_update(vc);
-	console_unlock();
+
 	return n;
 }
 
···
  */
 static void console_callback(struct work_struct *ignored)
 {
-	console_lock();
+	guard(console_lock)();
 
 	if (want_console >= 0) {
 		if (want_console != fg_console &&
···
 		blank_timer_expired = 0;
 	}
 	notify_update(vc_cons[fg_console].d);
-
-	console_unlock();
 }
 
 int set_console(int nr)
···
 			return -EPERM;
 		return paste_selection(tty);
 	case TIOCL_UNBLANKSCREEN:
-		console_lock();
-		unblank_screen();
-		console_unlock();
+		scoped_guard(console_lock)
+			unblank_screen();
 		break;
 	case TIOCL_SELLOADLUT:
 		if (!capable(CAP_SYS_ADMIN))
···
 		data = vt_get_shift_state();
 		return put_user(data, p);
 	case TIOCL_GETMOUSEREPORTING:
-		console_lock();	/* May be overkill */
-		data = mouse_reporting();
-		console_unlock();
+		scoped_guard(console_lock)	/* May be overkill */
+			data = mouse_reporting();
 		return put_user(data, p);
 	case TIOCL_SETVESABLANK:
 		return set_vesa_blanking(param);
···
 		 * Needs the console lock here. Note that lots of other calls
 		 * need fixing before the lock is actually useful!
 		 */
-		console_lock();
-		scrollfront(vc_cons[fg_console].d, lines);
-		console_unlock();
+		scoped_guard(console_lock)
+			scrollfront(vc_cons[fg_console].d, lines);
 		break;
 	case TIOCL_BLANKSCREEN:	/* until explicitly unblanked, not only poked */
-		console_lock();
-		ignore_poke = 1;
-		do_blank_screen(0);
-		console_unlock();
+		scoped_guard(console_lock) {
+			ignore_poke = 1;
+			do_blank_screen(0);
+		}
 		break;
 	case TIOCL_BLANKEDSCREEN:
 		return console_blanked;
···
 	if (in_interrupt())	/* from flush_to_ldisc */
 		return;
 
-	console_lock();
+	guard(console_lock)();
 	set_cursor(vc);
-	console_unlock();
 }
 
 /*
···
 	struct vc_data *vc;
 	int ret;
 
-	console_lock();
+	guard(console_lock)();
 	ret = vc_allocate(currcons);
 	if (ret)
-		goto unlock;
+		return ret;
 
 	vc = vc_cons[currcons].d;
 
 	/* Still being freed */
-	if (vc->port.tty) {
-		ret = -ERESTARTSYS;
-		goto unlock;
-	}
+	if (vc->port.tty)
+		return -ERESTARTSYS;
 
 	ret = tty_port_install(&vc->port, driver, tty);
 	if (ret)
-		goto unlock;
+		return ret;
 
 	tty->driver_data = vc;
 	vc->port.tty = tty;
···
 		tty->termios.c_iflag |= IUTF8;
 	else
 		tty->termios.c_iflag &= ~IUTF8;
-unlock:
-	console_unlock();
-	return ret;
+
+	return 0;
 }
 
 static int con_open(struct tty_struct *tty, struct file *filp)
···
 {
 	struct vc_data *vc = tty->driver_data;
 	BUG_ON(vc == NULL);
-	console_lock();
+
+	guard(console_lock)();
 	vc->port.tty = NULL;
-	console_unlock();
 }
 
 static void con_cleanup(struct tty_struct *tty)
···
 	struct con_driver *con = dev_get_drvdata(dev);
 	int bind = simple_strtoul(buf, NULL, 0);
 
-	console_lock();
+	guard(console_lock)();
 
 	if (bind)
 		vt_bind(con);
 	else
 		vt_unbind(con);
-
-	console_unlock();
 
 	return count;
 }
···
 	struct con_driver *con = dev_get_drvdata(dev);
 	int bind;
 
-	console_lock();
-	bind = con_is_bound(con->con);
-	console_unlock();
+	scoped_guard(console_lock)
+		bind = con_is_bound(con->con);
 
 	return sysfs_emit(buf, "%i\n", bind);
 }
···
 {
 	int i;
 
-	console_lock();
+	guard(console_lock)();
 
 	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
 		struct con_driver *con_driver = &registered_con_driver[i];
···
 		con_driver->first = 0;
 		con_driver->last = 0;
 	}
-
-	console_unlock();
 }
 
 /*
···
  */
 void give_up_console(const struct consw *csw)
 {
-	console_lock();
+	guard(console_lock)();
 	do_unregister_con_driver(csw);
-	console_unlock();
 }
 EXPORT_SYMBOL(give_up_console);
 
···
 	if (get_user(mode, mode_user))
 		return -EFAULT;
 
-	console_lock();
+	guard(console_lock)();
 	vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
-	console_unlock();
 
 	return 0;
 }
···
 	if (copy_from_user(colormap, arg, sizeof(colormap)))
 		return -EFAULT;
 
-	console_lock();
+	guard(console_lock)();
 	for (i = k = 0; i < 16; i++) {
 		default_red[i] = colormap[k++];
 		default_grn[i] = colormap[k++];
···
 		}
 		set_palette(vc_cons[i].d);
 	}
-	console_unlock();
 
 	return 0;
 }
···
 	int i, k;
 	unsigned char colormap[3*16];
 
-	console_lock();
-	for (i = k = 0; i < 16; i++) {
-		colormap[k++] = default_red[i];
-		colormap[k++] = default_grn[i];
-		colormap[k++] = default_blu[i];
-	}
-	console_unlock();
+	scoped_guard(console_lock)
+		for (i = k = 0; i < 16; i++) {
+			colormap[k++] = default_red[i];
+			colormap[k++] = default_grn[i];
+			colormap[k++] = default_blu[i];
+		}
 
 	if (copy_to_user(arg, colormap, sizeof(colormap)))
 		return -EFAULT;
···
 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
 {
 	struct console_font font;
-	int rc = -EINVAL;
 	int c;
 	unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
 
 	if (vpitch > max_font_height)
 		return -EINVAL;
 
+	void *font_data __free(kvfree) = NULL;
 	if (op->data) {
-		font.data = kvzalloc(max_font_size, GFP_KERNEL);
+		font.data = font_data = kvzalloc(max_font_size, GFP_KERNEL);
 		if (!font.data)
 			return -ENOMEM;
 	} else
 		font.data = NULL;
 
-	console_lock();
-	if (vc->vc_mode != KD_TEXT)
-		rc = -EINVAL;
-	else if (vc->vc_sw->con_font_get)
-		rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
-	else
-		rc = -ENOSYS;
-	console_unlock();
+	scoped_guard(console_lock) {
+		if (vc->vc_mode != KD_TEXT)
+			return -EINVAL;
+		if (!vc->vc_sw->con_font_get)
+			return -ENOSYS;
 
-	if (rc)
-		goto out;
+		int ret = vc->vc_sw->con_font_get(vc, &font, vpitch);
+		if (ret)
+			return ret;
+	}
 
 	c = (font.width+7)/8 * vpitch * font.charcount;
 
 	if (op->data && font.charcount > op->charcount)
-		rc = -ENOSPC;
+		return -ENOSPC;
 	if (font.width > op->width || font.height > op->height)
-		rc = -ENOSPC;
-	if (rc)
-		goto out;
+		return -ENOSPC;
 
 	op->height = font.height;
 	op->width = font.width;
 	op->charcount = font.charcount;
 
 	if (op->data && copy_to_user(op->data, font.data, c))
-		rc = -EFAULT;
+		return -EFAULT;
 
-out:
-	kvfree(font.data);
-	return rc;
+	return 0;
 }
 
 static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
 {
 	struct console_font font;
-	int rc = -EINVAL;
 	int size;
 	unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
 
-	if (vc->vc_mode != KD_TEXT)
-		return -EINVAL;
 	if (!op->data)
 		return -EINVAL;
 	if (op->charcount > max_font_glyphs)
···
 	if (size > max_font_size)
 		return -ENOSPC;
 
-	font.data = memdup_user(op->data, size);
+	void *font_data __free(kfree) = font.data = memdup_user(op->data, size);
 	if (IS_ERR(font.data))
 		return PTR_ERR(font.data);
 
···
 	font.width = op->width;
 	font.height = op->height;
 
-	console_lock();
+	guard(console_lock)();
+
 	if (vc->vc_mode != KD_TEXT)
-		rc = -EINVAL;
-	else if (vc->vc_sw->con_font_set) {
-		if (vc_is_sel(vc))
-			clear_selection();
-		rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
-	} else
-		rc = -ENOSYS;
-	console_unlock();
-	kfree(font.data);
-	return rc;
+		return -EINVAL;
+	if (!vc->vc_sw->con_font_set)
+		return -ENOSYS;
+
+	if (vc_is_sel(vc))
+		clear_selection();
+
+	return vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
 }
 
 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
···
 	struct console_font font = {.width = op->width, .height = op->height};
 	char name[MAX_FONT_NAME];
 	char *s = name;
-	int rc;
-
 
 	if (!op->data)
 		s = NULL;
···
 	else
 		name[MAX_FONT_NAME - 1] = 0;
 
-	console_lock();
-	if (vc->vc_mode != KD_TEXT) {
-		console_unlock();
-		return -EINVAL;
-	}
-	if (vc->vc_sw->con_font_default) {
+	scoped_guard(console_lock) {
+		if (vc->vc_mode != KD_TEXT)
+			return -EINVAL;
+		if (!vc->vc_sw->con_font_default)
+			return -ENOSYS;
+
 		if (vc_is_sel(vc))
 			clear_selection();
-		rc = vc->vc_sw->con_font_default(vc, &font, s);
-	} else
-		rc = -ENOSYS;
-	console_unlock();
-	if (!rc) {
-		op->width = font.width;
-		op->height = font.height;
+		int ret = vc->vc_sw->con_font_default(vc, &font, s);
+		if (ret)
+			return ret;
 	}
-	return rc;
+
+	op->width = font.width;
+	op->height = font.height;
+
+	return 0;
 }
 
 int con_font_op(struct vc_data *vc, struct console_font_op *op)

drivers/tty/vt/vt_ioctl.c

···
 		break;
 	}
 
-	case KDSETMODE:
+	case KDSETMODE: {
 		if (!perm)
 			return -EPERM;
 
-		console_lock();
-		ret = vt_kdsetmode(vc, arg);
-		console_unlock();
-		return ret;
-
+		guard(console_lock)();
+		return vt_kdsetmode(vc, arg);
+	}
 	case KDGETMODE:
 		return put_user(vc->vc_mode, (int __user *)arg);
 
···
 
 	vsa.console--;
 	vsa.console = array_index_nospec(vsa.console, MAX_NR_CONSOLES);
-	console_lock();
-	ret = vc_allocate(vsa.console);
-	if (ret) {
-		console_unlock();
-		return ret;
-	}
+	scoped_guard(console_lock) {
+		ret = vc_allocate(vsa.console);
+		if (ret)
+			return ret;
 
-	/*
-	 * This is safe providing we don't drop the console sem between
-	 * vc_allocate and finishing referencing nvc.
-	 */
-	nvc = vc_cons[vsa.console].d;
-	nvc->vt_mode = vsa.mode;
-	nvc->vt_mode.frsig = 0;
-	put_pid(nvc->vt_pid);
-	nvc->vt_pid = get_pid(task_pid(current));
-	console_unlock();
+		/*
+		 * This is safe providing we don't drop the console sem between
+		 * vc_allocate and finishing referencing nvc.
+		 */
+		nvc = vc_cons[vsa.console].d;
+		nvc->vt_mode = vsa.mode;
+		nvc->vt_mode.frsig = 0;
+		put_pid(nvc->vt_pid);
+		nvc->vt_pid = get_pid(task_pid(current));
+	}
 
 	/* Commence switch and lock */
 	/* Review set_console locks */
···
 static int vt_disallocate(unsigned int vc_num)
 {
 	struct vc_data *vc = NULL;
-	int ret = 0;
 
-	console_lock();
-	if (vt_busy(vc_num))
-		ret = -EBUSY;
-	else if (vc_num)
-		vc = vc_deallocate(vc_num);
-	console_unlock();
+	scoped_guard(console_lock) {
+		if (vt_busy(vc_num))
+			return -EBUSY;
+		if (vc_num)
+			vc = vc_deallocate(vc_num);
+	}
 
 	if (vc && vc_num >= MIN_NR_CONSOLES)
 		tty_port_put(&vc->port);
 
-	return ret;
+	return 0;
 }
 
 /* deallocate all unused consoles, but leave 0 */
···
 	struct vc_data *vc[MAX_NR_CONSOLES];
 	int i;
 
-	console_lock();
-	for (i = 1; i < MAX_NR_CONSOLES; i++)
-		if (!vt_busy(i))
-			vc[i] = vc_deallocate(i);
-		else
-			vc[i] = NULL;
-	console_unlock();
+	scoped_guard(console_lock)
+		for (i = 1; i < MAX_NR_CONSOLES; i++)
+			if (!vt_busy(i))
+				vc[i] = vc_deallocate(i);
+			else
+				vc[i] = NULL;
 
 	for (i = 1; i < MAX_NR_CONSOLES; i++) {
 		if (vc[i] && i >= MIN_NR_CONSOLES)
···
 
 		if (!vc_cons[i].d)
 			continue;
-		console_lock();
+		guard(console_lock)();
 		vcp = vc_cons[i].d;
 		if (vcp) {
 			int ret;
···
 			if (ret) {
 				vcp->vc_scan_lines = save_scan_lines;
 				vcp->vc_cell_height = save_cell_height;
-				console_unlock();
 				return ret;
 			}
 		}
-		console_unlock();
 	}
 
 	return 0;
···
 		if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS)
 			return -EINVAL;
 
-		console_lock();
+		guard(console_lock)();
 		vc->vt_mode = tmp;
 		/* the frsig is ignored, so we set it to 0 */
 		vc->vt_mode.frsig = 0;
···
 		vc->vt_pid = get_pid(task_pid(current));
 		/* no switch is required -- [e-mail] */
 		vc->vt_newvt = -1;
-		console_unlock();
 		break;
 	}
 
···
 		struct vt_mode tmp;
 		int rc;
 
-		console_lock();
-		memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
-		console_unlock();
+		scoped_guard(console_lock)
+			memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
 
 		rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
 		if (rc)
···
 			return -EFAULT;
 
 		state = 1;	/* /dev/tty0 is always open */
-		console_lock(); /* required by vt_in_use() */
-		for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
-				++i, mask <<= 1)
-			if (vt_in_use(i))
-				state |= mask;
-		console_unlock();
+		scoped_guard(console_lock) /* required by vt_in_use() */
+			for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1)
+				if (vt_in_use(i))
+					state |= mask;
 		return put_user(state, &vtstat->v_state);
 	}
 
···
 	 * Returns the first available (non-opened) console.
 	 */
 	case VT_OPENQRY:
-		console_lock(); /* required by vt_in_use() */
-		for (i = 0; i < MAX_NR_CONSOLES; ++i)
-			if (!vt_in_use(i))
-				break;
-		console_unlock();
+		scoped_guard(console_lock) /* required by vt_in_use() */
+			for (i = 0; i < MAX_NR_CONSOLES; ++i)
+				if (!vt_in_use(i))
+					break;
 		i = i < MAX_NR_CONSOLES ? (i+1) : -1;
 		return put_user(i, (int __user *)arg);
 
···
 
 		arg--;
 		arg = array_index_nospec(arg, MAX_NR_CONSOLES);
-		console_lock();
-		ret = vc_allocate(arg);
-		console_unlock();
-		if (ret)
-			return ret;
+		scoped_guard(console_lock) {
+			ret = vc_allocate(arg);
+			if (ret)
+				return ret;
+		}
 		set_console(arg);
 		break;
 
···
 	 *	2:	completed switch-to OK
 	 */
 	case VT_RELDISP:
+	{
 		if (!perm)
 			return -EPERM;
 
-		console_lock();
-		ret = vt_reldisp(vc, arg);
-		console_unlock();
-
-		return ret;
-
+		guard(console_lock)();
+		return vt_reldisp(vc, arg);
+	}
 
 	 /*
 	  * Disallocate memory associated to VT (but leave VT1)
···
 		    get_user(cc, &vtsizes->v_cols))
 			return -EFAULT;
 
-		console_lock();
+		guard(console_lock)();
 		for (i = 0; i < MAX_NR_CONSOLES; i++) {
 			vc = vc_cons[i].d;
 
 			if (vc) {
 				/* FIXME: review v tty lock */
-				__vc_resize(vc_cons[i].d, cc, ll, true);
+				ret = __vc_resize(vc_cons[i].d, cc, ll, true);
+				if (ret)
+					return ret;
 			}
 		}
-		console_unlock();
 		break;
 	}
 
···
 	struct vc_data *vc;
 	struct tty_struct *tty;
 
-	console_lock();
+	guard(console_lock)();
 	vc = vc_con->d;
-	if (vc) {
-		/* FIXME: review tty ref counting */
-		tty = vc->port.tty;
-		/*
-		 * SAK should also work in all raw modes and reset
-		 * them properly.
-		 */
-		if (tty)
-			__do_SAK(tty);
-		reset_vc(vc);
-	}
-	console_unlock();
+	if (!vc)
+		return;
+
+	/* FIXME: review tty ref counting */
+	tty = vc->port.tty;
+	/* SAK should also work in all raw modes and reset them properly. */
+	if (tty)
+		__do_SAK(tty);
+	reset_vc(vc);
 }
 
 #ifdef CONFIG_COMPAT
···
 {
 	int prev;
 
-	console_lock();
-	/* Graphics mode - up to X */
-	if (disable_vt_switch) {
-		console_unlock();
-		return 0;
-	}
-	prev = fg_console;
+	scoped_guard(console_lock) {
+		/* Graphics mode - up to X */
+		if (disable_vt_switch)
+			return 0;
 
-	if (alloc && vc_allocate(vt)) {
-		/* we can't have a free VC for now. Too bad,
-		 * we don't want to mess the screen for now. */
-		console_unlock();
-		return -ENOSPC;
-	}
+		prev = fg_console;
 
-	if (set_console(vt)) {
-		/*
-		 * We're unable to switch to the SUSPEND_CONSOLE.
-		 * Let the calling function know so it can decide
-		 * what to do.
-		 */
-		console_unlock();
-		return -EIO;
+		if (alloc && vc_allocate(vt)) {
+			/*
+			 * We can't have a free VC for now. Too bad, we don't want to mess the
+			 * screen for now.
+			 */
+			return -ENOSPC;
+		}
+
+		if (set_console(vt)) {
+			/*
+			 * We're unable to switch to the SUSPEND_CONSOLE. Let the calling function
+			 * know so it can decide what to do.
+			 */
+			return -EIO;
+		}
 	}
-	console_unlock();
 	if (vt_waitactive(vt + 1)) {
 		pr_debug("Suspend: Can't switch VCs.");
 		return -EINTR;
···
  */
 void pm_set_vt_switch(int do_switch)
 {
-	console_lock();
+	guard(console_lock)();
 	disable_vt_switch = !do_switch;
-	console_unlock();
 }
 EXPORT_SYMBOL(pm_set_vt_switch);

include/linux/console.h

···
  */
 extern atomic_t ignore_console_lock_warning;
 
+DEFINE_LOCK_GUARD_0(console_lock, console_lock(), console_unlock());
+
 extern void console_init(void);
 
 /* For deferred console takeover */

include/linux/console_struct.h

···
 	struct uni_pagedict *uni_pagedict;
 	struct uni_pagedict **uni_pagedict_loc; /* [!] Location of uni_pagedict variable for this console */
 	u32 **vc_uni_lines;			/* unicode screen content */
+	u16		*vc_saved_screen;
+	unsigned int	vc_saved_cols;
+	unsigned int	vc_saved_rows;
 	/* additional information is in vt_kern.h */
 };
 

include/linux/serial_core.h

···
 	spin_unlock_irqrestore(&up->lock, flags);
 }
 
+DEFINE_GUARD(uart_port_lock, struct uart_port *, uart_port_lock(_T), uart_port_unlock(_T));
+DEFINE_GUARD_COND(uart_port_lock, _try, uart_port_trylock(_T));
+
+DEFINE_GUARD(uart_port_lock_irq, struct uart_port *, uart_port_lock_irq(_T),
+	     uart_port_unlock_irq(_T));
+
+DEFINE_LOCK_GUARD_1(uart_port_lock_irqsave, struct uart_port,
+                    uart_port_lock_irqsave(_T->lock, &_T->flags),
+                    uart_port_unlock_irqrestore(_T->lock, _T->flags),
+                    unsigned long flags);
+DEFINE_LOCK_GUARD_1_COND(uart_port_lock_irqsave, _try,
+			 uart_port_trylock_irqsave(_T->lock, &_T->flags));
+
 static inline int serial_port_in(struct uart_port *up, int offset)
 {
 	return up->serial_in(up, offset);

include/linux/tty_port.h

···
 	__tty_port_tty_hangup(port, false, false);
 }
 
+#ifdef CONFIG_TTY
+void tty_kref_put(struct tty_struct *tty);
+__DEFINE_CLASS_IS_CONDITIONAL(tty_port_tty, true);
+__DEFINE_UNLOCK_GUARD(tty_port_tty, struct tty_struct, tty_kref_put(_T->lock));
+static inline class_tty_port_tty_t class_tty_port_tty_constructor(struct tty_port *tport)
+{
+	class_tty_port_tty_t _t = {
+		.lock = tty_port_tty_get(tport),
+	};
+	return _t;
+}
+#define scoped_tty()	((struct tty_struct *)(__guard_ptr(tty_port_tty)(&scope)))
+#endif
+
 #endif