drivers: autoconvert trivial BKL users to private mutex

All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.

None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.

Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.

These drivers do not seem to be under active
maintainance from my brief investigation. Apologies
to those maintainers that I have missed.

file=$1
name=$2
if grep -q lock_kernel ${file} ; then
if grep -q 'include.*linux.mutex.h' ${file} ; then
sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
else
sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
fi
sed -i ${file} \
-e "/^#include.*linux.mutex.h/,$ {
1,/^\(static\|int\|long\)/ {
/^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }" \
-e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
-e '/[ ]*cycle_kernel_lock();/d'
else
sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \
-e '/cycle_kernel_lock()/d'
fi

Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/block/paride/pg.c

···
 #include <linux/pg.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_* */
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/jiffies.h>
 
 #include <asm/uaccess.h>
···
 
 #define ATAPI_IDENTIFY		0x12
 
+static DEFINE_MUTEX(pg_mutex);
 static int pg_open(struct inode *inode, struct file *file);
 static int pg_release(struct inode *inode, struct file *file);
 static ssize_t pg_read(struct file *filp, char __user *buf,
···
 	struct pg *dev = &devices[unit];
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&pg_mutex);
 	if ((unit >= PG_UNITS) || (!dev->present)) {
 		ret = -ENODEV;
 		goto out;
···
 	file->private_data = dev;
 
 out:
-	unlock_kernel();
+	mutex_unlock(&pg_mutex);
 	return ret;
 }
 

drivers/block/paride/pt.c

···
 #include <linux/mtio.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_*, schedule_timeout() */
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 
···
 #define ATAPI_MODE_SENSE	0x1a
 #define ATAPI_LOG_SENSE		0x4d
 
+static DEFINE_MUTEX(pt_mutex);
 static int pt_open(struct inode *inode, struct file *file);
 static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 static int pt_release(struct inode *inode, struct file *file);
···
 	struct pt_unit *tape = pt + unit;
 	int err;
 
-	lock_kernel();
+	mutex_lock(&pt_mutex);
 	if (unit >= PT_UNITS || (!tape->present)) {
-		unlock_kernel();
+		mutex_unlock(&pt_mutex);
 		return -ENODEV;
 	}
 
···
 	}
 
 	file->private_data = tape;
-	unlock_kernel();
+	mutex_unlock(&pt_mutex);
 	return 0;
 
 out:
 	atomic_inc(&tape->available);
-	unlock_kernel();
+	mutex_unlock(&pt_mutex);
 	return err;
 }
 
···
 		switch (mtop.mt_op) {
 
 		case MTREW:
-			lock_kernel();
+			mutex_lock(&pt_mutex);
 			pt_rewind(tape);
-			unlock_kernel();
+			mutex_unlock(&pt_mutex);
 			return 0;
 
 		case MTWEOF:
-			lock_kernel();
+			mutex_lock(&pt_mutex);
 			pt_write_fm(tape);
-			unlock_kernel();
+			mutex_unlock(&pt_mutex);
 			return 0;
 
 		default:

drivers/char/apm-emulation.c

···
 #include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
···
 /*
  * Local variables
  */
+static DEFINE_MUTEX(apm_mutex);
 static atomic_t suspend_acks_pending = ATOMIC_INIT(0);
 static atomic_t userspace_notification_inhibit = ATOMIC_INIT(0);
 static int apm_disabled;
···
 	if (!as->suser || !as->writer)
 		return -EPERM;
 
-	lock_kernel();
+	mutex_lock(&apm_mutex);
 	switch (cmd) {
 	case APM_IOC_SUSPEND:
 		mutex_lock(&state_lock);
···
 		mutex_unlock(&state_lock);
 		break;
 	}
-	unlock_kernel();
+	mutex_unlock(&apm_mutex);
 
 	return err;
 }
···
 {
 	struct apm_user *as;
 
-	lock_kernel();
+	mutex_lock(&apm_mutex);
 	as = kzalloc(sizeof(*as), GFP_KERNEL);
 	if (as) {
 		/*
···
 
 		filp->private_data = as;
 	}
-	unlock_kernel();
+	mutex_unlock(&apm_mutex);
 
 	return as ? 0 : -ENOMEM;
 }

drivers/char/applicom.c

···
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/miscdevice.h>
 #include <linux/pci.h>
 #include <linux/wait.h>
···
 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
 #endif
 
+static DEFINE_MUTEX(ac_mutex);
 static char *applicom_pci_devnames[] = {
 	"PCI board",
 	"PCI2000IBS / PCI2000CAN",
···
 	if (IS_ERR(adgl))
 		return PTR_ERR(adgl);
 
-	lock_kernel();	
+	mutex_lock(&ac_mutex);	
 	IndexCard = adgl->num_card-1;
 	 
 	if(cmd != 6 && ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {
···
 			warncount--;
 		}
 		kfree(adgl);
-		unlock_kernel();
+		mutex_unlock(&ac_mutex);
 		return -EINVAL;
 	}
 
···
 	}
 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
 	kfree(adgl);
-	unlock_kernel();
+	mutex_unlock(&ac_mutex);
 	return 0;
 }
 

drivers/char/ds1302.c

···
 #include <linux/miscdevice.h>
 #include <linux/delay.h>
 #include <linux/bcd.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 
···
 
 #define RTC_MAJOR_NR 121 /* local major, change later */
 
+static DEFINE_MUTEX(rtc_mutex);
 static const char ds1302_name[] = "ds1302";
 
 /* Send 8 bits. */
···
 			struct rtc_time rtc_tm;
 
 			memset(&rtc_tm, 0, sizeof (struct rtc_time));
-			lock_kernel();
+			mutex_lock(&rtc_mutex);
 			get_rtc_time(&rtc_tm);
-			unlock_kernel();
+			mutex_unlock(&rtc_mutex);
 			if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
 				return -EFAULT;
 			return 0;
···
 			mon = bin2bcd(mon);
 			yrs = bin2bcd(yrs);
 
-			lock_kernel();
+			mutex_lock(&rtc_mutex);
 			local_irq_save(flags);
 			CMOS_WRITE(yrs, RTC_YEAR);
 			CMOS_WRITE(mon, RTC_MONTH);
···
 			CMOS_WRITE(min, RTC_MINUTES);
 			CMOS_WRITE(sec, RTC_SECONDS);
 			local_irq_restore(flags);
-			unlock_kernel();
+			mutex_unlock(&rtc_mutex);
 
 			/* Notice that at this point, the RTC is updated but
 			 * the kernel is still running with the old time.
···
 			if(copy_from_user(&tcs_val, (int*)arg, sizeof(int)))
 				return -EFAULT;
 
-			lock_kernel();
+			mutex_lock(&rtc_mutex);
 			tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
 			ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
-			unlock_kernel();
+			mutex_unlock(&rtc_mutex);
 			return 0;
 		}
 		default:

drivers/char/ds1620.c

···
 #include <linux/proc_fs.h>
 #include <linux/capability.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
···
 #define CFG_CPU			2
 #define CFG_1SHOT		1
 
+static DEFINE_MUTEX(ds1620_mutex);
 static const char *fan_state[] = { "off", "on", "on (hardwired)" };
 
 /*
···
 
 static int ds1620_open(struct inode *inode, struct file *file)
 {
-	cycle_kernel_lock();
 	return nonseekable_open(inode, file);
 }
 
···
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&ds1620_mutex);
 	ret = ds1620_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&ds1620_mutex);
 
 	return ret;
 }

drivers/char/dsp56k.c

···
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/device.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/firmware.h>
 #include <linux/platform_device.h>
 #include <linux/uaccess.h>	/* For put_user and get_user */
···
 	} \
 }
 
+static DEFINE_MUTEX(dsp56k_mutex);
 static struct dsp56k_device {
 	unsigned long in_use;
 	long maxio, timeout;
···
 			if (len > DSP56K_MAX_BINARY_LENGTH) {
 				return -EINVAL;
 			}
-			lock_kernel();
+			mutex_lock(&dsp56k_mutex);
 			r = dsp56k_upload(bin, len);
-			unlock_kernel();
+			mutex_unlock(&dsp56k_mutex);
 			if (r < 0) {
 				return r;
 			}
···
 		case DSP56K_SET_TX_WSIZE:
 			if (arg > 4 || arg < 1)
 				return -EINVAL;
-			lock_kernel();
+			mutex_lock(&dsp56k_mutex);
 			dsp56k.tx_wsize = (int) arg;
-			unlock_kernel();
+			mutex_unlock(&dsp56k_mutex);
 			break;
 		case DSP56K_SET_RX_WSIZE:
 			if (arg > 4 || arg < 1)
 				return -EINVAL;
-			lock_kernel();
+			mutex_lock(&dsp56k_mutex);
 			dsp56k.rx_wsize = (int) arg;
-			unlock_kernel();
+			mutex_unlock(&dsp56k_mutex);
 			break;
 		case DSP56K_HOST_FLAGS:
 		{
···
 			if(get_user(out, &hf->out) < 0)
 				return -EFAULT;
 
-			lock_kernel();
+			mutex_lock(&dsp56k_mutex);
 			if ((dir & 0x1) && (out & 0x1))
 				dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
 			else if (dir & 0x1)
···
 			if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
 			if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
 			if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
-			unlock_kernel();
+			mutex_unlock(&dsp56k_mutex);
 			return put_user(status, &hf->status);
 		}
 		case DSP56K_HOST_CMD:
 			if (arg > 31 || arg < 0)
 				return -EINVAL;
-			lock_kernel();
+			mutex_lock(&dsp56k_mutex);
 			dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
 							     DSP56K_CVR_HC);
-			unlock_kernel();
+			mutex_unlock(&dsp56k_mutex);
 			break;
 		default:
 			return -EINVAL;
···
 	int dev = iminor(inode) & 0x0f;
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&dsp56k_mutex);
 	switch(dev)
 	{
 	case DSP56K_DEV_56001:
···
 		ret = -ENODEV;
 	}
 out:
-	unlock_kernel();
+	mutex_unlock(&dsp56k_mutex);
 	return ret;
 }
 

drivers/char/dtlk.c

···
 #include <linux/ioport.h>	/* for request_region */
 #include <linux/delay.h>	/* for loops_per_jiffy */
 #include <linux/sched.h>
-#include <linux/smp_lock.h>	/* cycle_kernel_lock() */
+#include <linux/mutex.h>
 #include <asm/io.h>		/* for inb_p, outb_p, inb, outb, etc. */
 #include <asm/uaccess.h>	/* for get_user, etc. */
 #include <linux/wait.h>		/* for wait_queue */
···
 #define TRACE_RET ((void) 0)
 #endif				/* TRACING */
 
+static DEFINE_MUTEX(dtlk_mutex);
 static void dtlk_timer_tick(unsigned long data);
 
 static int dtlk_major;
···
 	switch (cmd) {
 
 	case DTLK_INTERROGATE:
-		lock_kernel();
+		mutex_lock(&dtlk_mutex);
 		sp = dtlk_interrogate();
-		unlock_kernel();
+		mutex_unlock(&dtlk_mutex);
 		if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
 			return -EINVAL;
 		return 0;
···
 {
 	TRACE_TEXT("(dtlk_open");
 
-	cycle_kernel_lock();
 	nonseekable_open(inode, file);
 	switch (iminor(inode)) {
 	case DTLK_MINOR:

drivers/char/generic_nvram.c

···
 #include <linux/miscdevice.h>
 #include <linux/fcntl.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <asm/nvram.h>
 #ifdef CONFIG_PPC_PMAC
···
 
 #define NVRAM_SIZE	8192
 
+static DEFINE_MUTEX(nvram_mutex);
 static ssize_t nvram_len;
 
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
···
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&nvram_mutex);
 	ret = nvram_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&nvram_mutex);
 
 	return ret;
 }

drivers/char/genrtc.c

···
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/workqueue.h>
 
 #include <asm/uaccess.h>
···
  *	ioctls.
  */
 
+static DEFINE_MUTEX(gen_rtc_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
 
 /*
···
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&gen_rtc_mutex);
 	ret = gen_rtc_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&gen_rtc_mutex);
 
 	return ret;
 }
···
 
 static int gen_rtc_open(struct inode *inode, struct file *file)
 {
-	lock_kernel();
+	mutex_lock(&gen_rtc_mutex);
 	if (gen_rtc_status & RTC_IS_OPEN) {
-		unlock_kernel();
+		mutex_unlock(&gen_rtc_mutex);
 		return -EBUSY;
 	}
 
 	gen_rtc_status |= RTC_IS_OPEN;
 	gen_rtc_irq_data = 0;
 	irq_active = 0;
-	unlock_kernel();
+	mutex_unlock(&gen_rtc_mutex);
 
 	return 0;
 }

drivers/char/i8k.c

···
 #include <linux/seq_file.h>
 #include <linux/dmi.h>
 #include <linux/capability.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
···
 
 #define I8K_TEMPERATURE_BUG	1
 
+static DEFINE_MUTEX(i8k_mutex);
 static char bios_version[4];
 
 MODULE_AUTHOR("Massimo Dal Zotto ([e-mail])");
···
 {
 	long ret;
 
-	lock_kernel();
+	mutex_lock(&i8k_mutex);
 	ret = i8k_ioctl_unlocked(fp, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&i8k_mutex);
 
 	return ret;
 }

drivers/char/ip2/ip2main.c

···
 #include <linux/major.h>
 #include <linux/wait.h>
 #include <linux/device.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/firmware.h>
 #include <linux/platform_device.h>
 
···
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+static DEFINE_MUTEX(ip2_mutex);
 static const struct file_operations ip2mem_proc_fops;
 static const struct file_operations ip2_proc_fops;
 
···
 	printk (KERN_DEBUG "IP2IPL: ioctl cmd %d, arg %ld\n", cmd, arg );
 #endif
 
-	lock_kernel();
+	mutex_lock(&ip2_mutex);
 
 	switch ( iplminor ) {
 	case 0:	    // IPL device
···
 		rc = -ENODEV;
 		break;
 	}
-	unlock_kernel();
+	mutex_unlock(&ip2_mutex);
 	return rc;
 }
 
···
 #ifdef IP2DEBUG_IPL
 	printk (KERN_DEBUG "IP2IPL: open\n" );
 #endif
-	cycle_kernel_lock();
 	return 0;
 }
 

drivers/char/lp.c

···
 #include <linux/device.h>
 #include <linux/wait.h>
 #include <linux/jiffies.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/compat.h>
 
 #include <linux/parport.h>
···
 /* if you have more than 8 printers, remember to increase LP_NO */
 #define LP_NO 8
 
+static DEFINE_MUTEX(lp_mutex);
 static struct lp_struct lp_table[LP_NO];
 
 static unsigned int lp_count = 0;
···
 	unsigned int minor = iminor(inode);
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&lp_mutex);
 	if (minor >= LP_NO) {
 		ret = -ENXIO;
 		goto out;
···
 	lp_release_parport (&lp_table[minor]);
 	lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 out:
-	unlock_kernel();
+	mutex_unlock(&lp_mutex);
 	return ret;
 }
 
···
 	int ret;
 
 	minor = iminor(file->f_path.dentry->d_inode);
-	lock_kernel();
+	mutex_lock(&lp_mutex);
 	switch (cmd) {
 	case LPSETTIMEOUT:
 		if (copy_from_user(&par_timeout, (void __user *)arg,
···
 		ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
 		break;
 	}
-	unlock_kernel();
+	mutex_unlock(&lp_mutex);
 
 	return ret;
 }
···
 	int ret;
 
 	minor = iminor(file->f_path.dentry->d_inode);
-	lock_kernel();
+	mutex_lock(&lp_mutex);
 	switch (cmd) {
 	case LPSETTIMEOUT:
 		tc = compat_ptr(arg);
···
 		ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
 		break;
 	}
-	unlock_kernel();
+	mutex_unlock(&lp_mutex);
 
 	return ret;
 }

drivers/char/mbcs.c

···
 #include <linux/mm.h>
 #include <linux/uio.h>
 #include <linux/mutex.h>
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
···
 #else
 #define DBG(fmt...)
 #endif
+static DEFINE_MUTEX(mbcs_mutex);
 static int mbcs_major;
 
 static LIST_HEAD(soft_list);
···
 	struct mbcs_soft *soft;
 	int minor;
 
-	lock_kernel();
+	mutex_lock(&mbcs_mutex);
 	minor = iminor(ip);
 
 	/* Nothing protects access to this list... */
 	list_for_each_entry(soft, &soft_list, list) {
 		if (soft->nasid == minor) {
 			fp->private_data = soft->cxdev;
-			unlock_kernel();
+			mutex_unlock(&mbcs_mutex);
 			return 0;
 		}
 	}
 
-	unlock_kernel();
+	mutex_unlock(&mbcs_mutex);
 	return -ENODEV;
 }
 

drivers/char/mmtimer.c

···
 #include <linux/interrupt.h>
 #include <linux/time.h>
 #include <linux/math64.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 
 #include <asm/uaccess.h>
···
 
 #define rtc_time()              (*RTC_COUNTER_ADDR)
 
+static DEFINE_MUTEX(mmtimer_mutex);
 static long mmtimer_ioctl(struct file *file, unsigned int cmd,
 						unsigned long arg);
 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);
···
 {
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&mmtimer_mutex);
 
 	switch (cmd) {
 	case MMTIMER_GETOFFSET:	/* offset of the counter */
···
 		ret = -ENOTTY;
 		break;
 	}
-	unlock_kernel();
+	mutex_unlock(&mmtimer_mutex);
 	return ret;
 }
 

drivers/char/mwave/mwavedd.c

···
 #include <linux/serial.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/serial_8250.h>
 #include "smapi.h"
···
 * checks are made against other devices (ie. superio) for conflicts.
 * We'll depend on users using the tpctl utility to do that for now
 */
+static DEFINE_MUTEX(mwave_mutex);
 int mwave_debug = 0;
 int mwave_3780i_irq = 0;
 int mwave_3780i_io = 0;
···
 	PRINTK_2(TRACE_MWAVE,
 		"mwavedd::mwave_open, exit return retval %x\n", retval);
 
-	cycle_kernel_lock();
 	return retval;
 }
 
···
 			PRINTK_1(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl, IOCTL_MW_RESET"
 				" calling tp3780I_ResetDSP\n");
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_ResetDSP(&pDrvData->rBDData);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 			PRINTK_2(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl, IOCTL_MW_RESET"
 				" retval %x from tp3780I_ResetDSP\n",
···
 			PRINTK_1(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl, IOCTL_MW_RUN"
 				" calling tp3780I_StartDSP\n");
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_StartDSP(&pDrvData->rBDData);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 			PRINTK_2(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl, IOCTL_MW_RUN"
 				" retval %x from tp3780I_StartDSP\n",
···
 				"mwavedd::mwave_ioctl,"
 				" IOCTL_MW_DSP_ABILITIES calling"
 				" tp3780I_QueryAbilities\n");
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_QueryAbilities(&pDrvData->rBDData,
 					&rAbilities);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 			PRINTK_2(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl, IOCTL_MW_DSP_ABILITIES"
 				" retval %x from tp3780I_QueryAbilities\n",
···
 				"mwavedd::mwave_ioctl IOCTL_MW_READ_DATA,"
 				" size %lx, ioarg %lx pusBuffer %p\n",
 				rReadData.ulDataLength, ioarg, pusBuffer);
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
 					iocmd,
 					pusBuffer,
 					rReadData.ulDataLength,
 					rReadData.usDspAddress);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	
···
 				" size %lx, ioarg %lx pusBuffer %p\n",
 				rReadData.ulDataLength / 2, ioarg,
 				pusBuffer);
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
 				iocmd, pusBuffer,
 				rReadData.ulDataLength / 2,
 				rReadData.usDspAddress);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	
···
 				" size %lx, ioarg %lx pusBuffer %p\n",
 				rWriteData.ulDataLength, ioarg,
 				pusBuffer);
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
 					iocmd, pusBuffer,
 					rWriteData.ulDataLength,
 					rWriteData.usDspAddress);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	
···
 				" size %lx, ioarg %lx pusBuffer %p\n",
 				rWriteData.ulDataLength, ioarg,
 				pusBuffer);
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			retval = tp3780I_ReadWriteDspIStore(&pDrvData->rBDData,
 					iocmd, pusBuffer,
 					rWriteData.ulDataLength,
 					rWriteData.usDspAddress);
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	
···
 				ipcnum,
 				pDrvData->IPCs[ipcnum].usIntCount);
 
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			pDrvData->IPCs[ipcnum].bIsHere = FALSE;
 			pDrvData->IPCs[ipcnum].bIsEnabled = TRUE;
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 	
 			PRINTK_2(TRACE_MWAVE,
 				"mwavedd::mwave_ioctl IOCTL_MW_REGISTER_IPC"
···
 				ipcnum,
 				pDrvData->IPCs[ipcnum].usIntCount);
 	
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
 				DECLARE_WAITQUEUE(wait, current);
 
···
 					" processing\n",
 					ipcnum);
 			}
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	
···
 						ipcnum);
 				return -EINVAL;
 			}
-			lock_kernel();
+			mutex_lock(&mwave_mutex);
 			if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
 				pDrvData->IPCs[ipcnum].bIsEnabled = FALSE;
 				if (pDrvData->IPCs[ipcnum].bIsHere == TRUE) {
 					wake_up_interruptible(&pDrvData->IPCs[ipcnum].ipc_wait_queue);
 				}
 			}
-			unlock_kernel();
+			mutex_unlock(&mwave_mutex);
 		}
 			break;
 	

drivers/char/nvram.c

···
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/system.h>
 
+static DEFINE_MUTEX(nvram_mutex);
 static DEFINE_SPINLOCK(nvram_state_lock);
 static int nvram_open_cnt;	/* #times opened */
 static int nvram_open_mode;	/* special open modes */
···
 		if (!capable(CAP_SYS_ADMIN))
 			return -EACCES;
 
-		lock_kernel();
+		mutex_lock(&nvram_mutex);
 		spin_lock_irq(&rtc_lock);
 
 		for (i = 0; i < NVRAM_BYTES; ++i)
···
 		__nvram_set_checksum();
 
 		spin_unlock_irq(&rtc_lock);
-		unlock_kernel();
+		mutex_unlock(&nvram_mutex);
 		return 0;
 
 	case NVRAM_SETCKS:
···
 		if (!capable(CAP_SYS_ADMIN))
 			return -EACCES;
 
-		lock_kernel();
+		mutex_lock(&nvram_mutex);
 		spin_lock_irq(&rtc_lock);
 		__nvram_set_checksum();
 		spin_unlock_irq(&rtc_lock);
-		unlock_kernel();
+		mutex_unlock(&nvram_mutex);
 		return 0;
 
 	default:

drivers/char/nwflash.c

···
 #include <linux/spinlock.h>
 #include <linux/rwsem.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/jiffies.h>
 
···
 
 #define	NWFLASH_VERSION "6.4"
 
+static DEFINE_MUTEX(flash_mutex);
 static void kick_open(void);
 static int get_flash_id(void);
 static int erase_block(int nBlock);
···
 
 static long flash_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 {
-	lock_kernel();
+	mutex_lock(&flash_mutex);
 	switch (cmd) {
 	case CMD_WRITE_DISABLE:
 		gbWriteBase64Enable = 0;
···
 	default:
 		gbWriteBase64Enable = 0;
 		gbWriteEnable = 0;
-		unlock_kernel();
+		mutex_unlock(&flash_mutex);
 		return -EINVAL;
 	}
-	unlock_kernel();
+	mutex_unlock(&flash_mutex);
 	return 0;
 }
 
···
 {
 	loff_t ret;
 
-	lock_kernel();
+	mutex_lock(&flash_mutex);
 	if (flashdebug)
 		printk(KERN_DEBUG "flash_llseek: offset=0x%X, orig=0x%X.\n",
 		       (unsigned int) offset, orig);
···
 	default:
 		ret = -EINVAL;
 	}
-	unlock_kernel();
+	mutex_unlock(&flash_mutex);
 	return ret;
 }
 

drivers/char/pcmcia/cm4000_cs.c

···
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <linux/bitrev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 
···
 			   __func__ , ## args);		\
 	} while (0)
 
+static DEFINE_MUTEX(cmm_mutex);
 static char *version = "cm4000_cs.c v2.4.0gm6 - All bugs added by Harald Welte";
 
 #define	T_1SEC		(HZ)
···
 	       iminor(inode), ioctl_names[_IOC_NR(cmd)]);
 #endif
 
-	lock_kernel();
+	mutex_lock(&cmm_mutex);
 	rc = -ENODEV;
 	link = dev_table[iminor(inode)];
 	if (!pcmcia_dev_present(link)) {
···
 		rc = -ENOTTY;
 	}
 out:
-	unlock_kernel();
+	mutex_unlock(&cmm_mutex);
 	return rc;
 }
 
···
 	if (minor >= CM4000_MAX_DEV)
 		return -ENODEV;
 
-	lock_kernel();
+	mutex_lock(&cmm_mutex);
 	link = dev_table[minor];
 	if (link == NULL || !pcmcia_dev_present(link)) {
 		ret = -ENODEV;
···
 	DEBUGP(2, dev, "<- cmm_open\n");
 	ret = nonseekable_open(inode, filp);
 out:
-	unlock_kernel();
+	mutex_unlock(&cmm_mutex);
 	return ret;
 }
 

drivers/char/pcmcia/cm4040_cs.c

···
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <linux/poll.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/wait.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
···
 			   __func__ , ## args);		\
 	} while (0)
 
+static DEFINE_MUTEX(cm4040_mutex);
 static char *version =
 "OMNIKEY CardMan 4040 v1.1.0gm5 - All bugs added by Harald Welte";
 
···
 	if (minor >= CM_MAX_DEV)
 		return -ENODEV;
 
-	lock_kernel();
+	mutex_lock(&cm4040_mutex);
 	link = dev_table[minor];
 	if (link == NULL || !pcmcia_dev_present(link)) {
 		ret = -ENODEV;
···
 	DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
 	ret = nonseekable_open(inode, filp);
 out:
-	unlock_kernel();
+	mutex_unlock(&cm4040_mutex);
 	return ret;
 }
 

drivers/char/ppdev.c

···
 #include <linux/slab.h>
 #include <linux/major.h>
 #include <linux/ppdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 
 #define PP_VERSION "ppdev: user-space parallel port driver"
···
 /* ROUND_UP macro from fs/select.c */
 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
 
+static DEFINE_MUTEX(pp_do_mutex);
 static inline void pp_enable_irq (struct pp_struct *pp)
 {
 	struct parport *port = pp->pdev->port;
···
 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	long ret;
-	lock_kernel();
+	mutex_lock(&pp_do_mutex);
 	ret = pp_do_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&pp_do_mutex);
 	return ret;
 }
 
···
 	unsigned int minor = iminor(inode);
 	struct pp_struct *pp;
 
-	cycle_kernel_lock();
 	if (minor >= PARPORT_MAX)
 		return -ENXIO;
 

drivers/char/rio/rio_linux.c

···
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/miscdevice.h>
 #include <linux/init.h>
 
···
 
 
 /* These constants are derived from SCO Source */
+static DEFINE_MUTEX(rio_fw_mutex);
 static struct Conf
  RIOConf = {
 	/* locator */ "RIO Config here",
···
 	func_enter();
 
 	/* The "dev" argument isn't used. */
-	lock_kernel();
+	mutex_lock(&rio_fw_mutex);
 	rc = riocontrol(p, 0, cmd, arg, capable(CAP_SYS_ADMIN));
-	unlock_kernel();
+	mutex_unlock(&rio_fw_mutex);
 
 	func_exit();
 	return rc;

drivers/char/snsc.c

···
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/sn/io.h>
 #include <asm/sn/sn_sal.h>
 #include <asm/sn/module.h>
···
 #define SCDRV_BUFSZ	2048
 #define SCDRV_TIMEOUT	1000
 
+static DEFINE_MUTEX(scdrv_mutex);
 static irqreturn_t
 scdrv_interrupt(int irq, void *subch_data)
 {
···
 	file->private_data = sd;
 
 	/* hook this subchannel up to the system controller interrupt */
-	lock_kernel();
+	mutex_lock(&scdrv_mutex);
 	rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt,
 			 IRQF_SHARED | IRQF_DISABLED,
 			 SYSCTL_BASENAME, sd);
···
 		ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch);
 		kfree(sd);
 		printk("%s: irq request failed (%d)\n", __func__, rv);
-		unlock_kernel();
+		mutex_unlock(&scdrv_mutex);
 		return -EBUSY;
 	}
-	unlock_kernel();
+	mutex_unlock(&scdrv_mutex);
 	return 0;
 }
 

drivers/char/toshiba.c

···
 #include <linux/stat.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/toshiba.h>
 
 #define TOSH_MINOR_DEV 181
···
 MODULE_DESCRIPTION("Toshiba laptop SMM driver");
 MODULE_SUPPORTED_DEVICE("toshiba");
 
+static DEFINE_MUTEX(tosh_mutex);
 static int tosh_fn;
 module_param_named(fn, tosh_fn, int, 0);
 MODULE_PARM_DESC(fn, "User specified Fn key detection port");
···
 				return -EINVAL;
 
 			/* do we need to emulate the fan ? */
-			lock_kernel();
+			mutex_lock(&tosh_mutex);
 			if (tosh_fan==1) {
 				if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
 					err = tosh_emulate_fan(&regs);
-					unlock_kernel();
+					mutex_unlock(&tosh_mutex);
 					break;
 				}
 			}
 			err = tosh_smm(&regs);
-			unlock_kernel();
+			mutex_unlock(&tosh_mutex);
 			break;
 		default:
 			return -EINVAL;

drivers/char/viotape.c

···
 #include <linux/completion.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 
 #include <asm/uaccess.h>
···
 #define VIOTAPE_KERN_WARN	KERN_WARNING "viotape: "
 #define VIOTAPE_KERN_INFO	KERN_INFO "viotape: "
 
+static DEFINE_MUTEX(proc_viotape_mutex);
 static int viotape_numdev;
 
 /*
···
 {
 	long rc;
 
-	lock_kernel();
+	mutex_lock(&proc_viotape_mutex);
 	rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&proc_viotape_mutex);
 	return rc;
 }
 
···
 	if (op == NULL)
 		return -ENOMEM;
 
-	lock_kernel();
+	mutex_lock(&proc_viotape_mutex);
 	get_dev_info(file->f_path.dentry->d_inode, &devi);
 
 	/* Note: We currently only support one mode! */
···
 
 free_op:
 	free_op_struct(op);
-	unlock_kernel();
+	mutex_unlock(&proc_viotape_mutex);
 	return ret;
 }
 

drivers/char/xilinx_hwicap/xilinx_hwicap.c

···
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>
-#include <linux/smp_lock.h>
 #include <linux/sysctl.h>
 #include <linux/fs.h>
 #include <linux/cdev.h>
···
 #define HWICAP_DEVICES 1
 
 /* An array, which is set to true when the device is registered. */
+static DEFINE_MUTEX(hwicap_mutex);
 static bool probed_devices[HWICAP_DEVICES];
 static struct mutex icap_sem;
 
···
 	struct hwicap_drvdata *drvdata;
 	int status;
 
-	lock_kernel();
+	mutex_lock(&hwicap_mutex);
 	drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
 
 	status = mutex_lock_interruptible(&drvdata->sem);
···
  error:
 	mutex_unlock(&drvdata->sem);
  out:
-	unlock_kernel();
+	mutex_unlock(&hwicap_mutex);
 	return status;
 }
 

drivers/hwmon/fschmd.c

···
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
-#include <linux/smp_lock.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/sysfs.h>
···
 #include <linux/kref.h>
 
 /* Addresses to scan */
+static DEFINE_MUTEX(watchdog_mutex);
 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
 
 /* Insmod parameters */
···
 	int i, ret = 0;
 	struct fschmd_data *data = filp->private_data;
 
-	lock_kernel();
+	mutex_lock(&watchdog_mutex);
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
 		ident.firmware_version = data->revision;
···
 	default:
 		ret = -ENOTTY;
 	}
-	unlock_kernel();
+	mutex_unlock(&watchdog_mutex);
 	return ret;
 }
 

drivers/hwmon/w83793.c

···
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
-#include <linux/smp_lock.h>
 #include <linux/hwmon-vid.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
···
 #define WATCHDOG_TIMEOUT 2	/* 2 minute default timeout */
 
 /* Addresses to scan */
+static DEFINE_MUTEX(watchdog_mutex);
 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
 						I2C_CLIENT_END };
 
···
 	int val, ret = 0;
 	struct w83793_data *data = filp->private_data;
 
-	lock_kernel();
+	mutex_lock(&watchdog_mutex);
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
 		if (!nowayout)
···
 	default:
 		ret = -ENOTTY;
 	}
-	unlock_kernel();
+	mutex_unlock(&watchdog_mutex);
 	return ret;
 }
 

drivers/input/misc/hp_sdc_rtc.c

···
 #include <linux/proc_fs.h>
 #include <linux/poll.h>
 #include <linux/rtc.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/semaphore.h>
 
 MODULE_AUTHOR("Brian S. Julin <[e-mail]>");
···
 
 #define RTC_VERSION "1.10d"
 
+static DEFINE_MUTEX(hp_sdc_rtc_mutex);
 static unsigned long epoch = 2000;
 
 static struct semaphore i8042tregs;
···
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&hp_sdc_rtc_mutex);
 	ret = hp_sdc_rtc_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&hp_sdc_rtc_mutex);
 
 	return ret;
 }

drivers/misc/phantom.c

···
 #include <linux/slab.h>
 #include <linux/phantom.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/atomic.h>
 #include <asm/io.h>
···
 #define PHB_RUNNING		1
 #define PHB_NOT_OH		2
 
+static DEFINE_MUTEX(phantom_mutex);
 static struct class *phantom_class;
 static int phantom_major;
 
···
 	struct phantom_device *dev = container_of(inode->i_cdev,
 			struct phantom_device, cdev);
 
-	lock_kernel();
+	mutex_lock(&phantom_mutex);
 	nonseekable_open(inode, file);
 
 	if (mutex_lock_interruptible(&dev->open_lock)) {
-		unlock_kernel();
+		mutex_unlock(&phantom_mutex);
 		return -ERESTARTSYS;
 	}
 
 	if (dev->opened) {
 		mutex_unlock(&dev->open_lock);
-		unlock_kernel();
+		mutex_unlock(&phantom_mutex);
 		return -EINVAL;
 	}
 
···
 	atomic_set(&dev->counter, 0);
 	dev->opened++;
 	mutex_unlock(&dev->open_lock);
-	unlock_kernel();
+	mutex_unlock(&phantom_mutex);
 	return 0;
 }
 

drivers/pci/hotplug/cpqphp_sysfs.c

···
 #include <linux/workqueue.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/debugfs.h>
 #include "cpqphp.h"
 
+static DEFINE_MUTEX(cpqphp_mutex);
 static int show_ctrl (struct controller *ctrl, char *buf)
 {
 	char *out = buf;
···
 	struct ctrl_dbg *dbg;
 	int retval = -ENOMEM;
 
-	lock_kernel();
+	mutex_lock(&cpqphp_mutex);
 	dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
 	if (!dbg)
 		goto exit;
···
 	file->private_data = dbg;
 	retval = 0;
 exit:
-	unlock_kernel();
+	mutex_unlock(&cpqphp_mutex);
 	return retval;
 }
 
···
 	struct ctrl_dbg *dbg;
 	loff_t new = -1;
 
-	lock_kernel();
+	mutex_lock(&cpqphp_mutex);
 	dbg = file->private_data;
 
 	switch (whence) {
···
 		break;
 	}
 	if (new < 0 || new > dbg->size) {
-		unlock_kernel();
+		mutex_unlock(&cpqphp_mutex);
 		return -EINVAL;
 	}
-	unlock_kernel();
+	mutex_unlock(&cpqphp_mutex);
 	return (file->f_pos = new);
 }
 

drivers/rtc/rtc-m41t80.c

···
 #include <linux/module.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/string.h>
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 #include <linux/fs.h>
···
 
 #define DRV_VERSION "0.05"
 
+static DEFINE_MUTEX(m41t80_rtc_mutex);
 static const struct i2c_device_id m41t80_id[] = {
 	{ "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
 	{ "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD },
···
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&m41t80_rtc_mutex);
 	ret = wdt_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&m41t80_rtc_mutex);
 
 	return ret;
 }
···
 static int wdt_open(struct inode *inode, struct file *file)
 {
 	if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
-		lock_kernel();
+		mutex_lock(&m41t80_rtc_mutex);
 		if (test_and_set_bit(0, &wdt_is_open)) {
-			unlock_kernel();
+			mutex_unlock(&m41t80_rtc_mutex);
 			return -EBUSY;
 		}
 		/*
 		 *	Activate
 		 */
 		wdt_is_open = 1;
-		unlock_kernel();
+		mutex_unlock(&m41t80_rtc_mutex);
 		return nonseekable_open(inode, file);
 	}
 	return -ENODEV;

drivers/sbus/char/jsflash.c

···
  */
 
 #include <linux/module.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/miscdevice.h>
···
 #define JSF_NPART	 3	/* 3 minors per flash device */
 #define JSF_PART_BITS	 2	/* 2 bits of minors to cover JSF_NPART */
 #define JSF_PART_MASK	 0x3	/* 2 bits mask */
+
+static DEFINE_MUTEX(jsf_mutex);
 
 /*
  * Access functions.
···
 {
 	loff_t ret;
 
-	lock_kernel();
+	mutex_lock(&jsf_mutex);
 	switch (orig) {
 		case 0:
 			file->f_pos = offset;
···
 		default:
 			ret = -EINVAL;
 	}
-	unlock_kernel();
+	mutex_unlock(&jsf_mutex);
 	return ret;
 }
 
···
 
 static long jsf_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 {
-	lock_kernel();
+	mutex_lock(&jsf_mutex);
 	int error = -ENOTTY;
 	void __user *argp = (void __user *)arg;
 
 	if (!capable(CAP_SYS_ADMIN)) {
-		unlock_kernel();
+		mutex_unlock(&jsf_mutex);
 		return -EPERM;
 	}
 	switch (cmd) {
 	case JSFLASH_IDENT:
 		if (copy_to_user(argp, &jsf0.id, JSFIDSZ)) {
-			unlock_kernel();
+			mutex_unlock(&jsf_mutex);
 			return -EFAULT;
 		}
 		break;
···
 		break;
 	}
 
-	unlock_kernel();
+	mutex_unlock(&jsf_mutex);
 	return error;
 }
 
···
 
 static int jsf_open(struct inode * inode, struct file * filp)
 {
-	lock_kernel();
+	mutex_lock(&jsf_mutex);
 	if (jsf0.base == 0) {
-		unlock_kernel();
+		mutex_unlock(&jsf_mutex);
 		return -ENXIO;
 	}
 	if (test_and_set_bit(0, (void *)&jsf0.busy) != 0) {
-		unlock_kernel();
+		mutex_unlock(&jsf_mutex);
 		return -EBUSY;
 	}
 
-	unlock_kernel();
+	mutex_unlock(&jsf_mutex);
 	return 0;	/* XXX What security? */
 }
 

drivers/telephony/ixj.c

···
 #include <linux/fs.h>		/* everything... */
 #include <linux/errno.h>	/* error codes */
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/mm.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
···
 #define TYPE(inode) (iminor(inode) >> 4)
 #define NUM(inode) (iminor(inode) & 0xf)
 
+static DEFINE_MUTEX(ixj_mutex);
 static int ixjdebug;
 static int hertz = HZ;
 static int samplerate = 100;
···
 static long ixj_ioctl(struct file *file_p, unsigned int cmd, unsigned long arg)
 {
 	long ret;
-	lock_kernel();
+	mutex_lock(&ixj_mutex);
 	ret = do_ixj_ioctl(file_p, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&ixj_mutex);
 	return ret;
 }
 

drivers/watchdog/cpwd.c

···
 #include <linux/ioport.h>
 #include <linux/timer.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
···
 	} devs[WD_NUMDEVS];
 };
 
+static DEFINE_MUTEX(cpwd_mutex);
 static struct cpwd *cpwd_device;
 
 /* Sun uses Altera PLD EPF8820ATC144-4
···
 {
 	struct cpwd *p = cpwd_device;
 
-	lock_kernel();
+	mutex_lock(&cpwd_mutex);
 	switch (iminor(inode)) {
 	case WD0_MINOR:
 	case WD1_MINOR:
···
 		break;
 
 	default:
-		unlock_kernel();
+		mutex_unlock(&cpwd_mutex);
 		return -ENODEV;
 	}
 
···
 				IRQF_SHARED, DRIVER_NAME, p)) {
 			printk(KERN_ERR PFX "Cannot register IRQ %d\n",
 				p->irq);
-			unlock_kernel();
+			mutex_unlock(&cpwd_mutex);
 			return -EBUSY;
 		}
 		p->initialized = true;
 	}
 
-	unlock_kernel();
+	mutex_unlock(&cpwd_mutex);
 
 	return nonseekable_open(inode, f);
 }
···
 	case WIOCSTART:
 	case WIOCSTOP:
 	case WIOCGSTAT:
-		lock_kernel();
+		mutex_lock(&cpwd_mutex);
 		rval = cpwd_ioctl(file, cmd, arg);
-		unlock_kernel();
+		mutex_unlock(&cpwd_mutex);
 		break;
 
 	/* everything else is handled by the generic compat layer */