dmaengine: hsu: refactor hsu_dma_do_irq() to return int

Since we have nice macro IRQ_RETVAL() we would use it to convert a flag of
handled interrupt from int to irqreturn_t.

The rationale of doing this is:
a) hence we implicitly mark hsu_dma_do_irq() as an auxiliary function that
can't be used as interrupt handler directly, and
b) to be in align with serial driver which is using serial8250_handle_irq()
that returns plain int by design.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/dma/hsu/hsu.c

···
  *      is not a normal timeout interrupt, ie. hsu_dma_get_status() returned 0.
  *
  *      Return:
- *      IRQ_NONE for invalid channel number, IRQ_HANDLED otherwise.
+ *      0 for invalid channel number, 1 otherwise.
  */
-irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
-			   u32 status)
+int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status)
 {
 	struct hsu_dma_chan *hsuc;
 	struct hsu_dma_desc *desc;
···
 
 	/* Sanity check */
 	if (nr >= chip->hsu->nr_channels)
-		return IRQ_NONE;
+		return 0;
 
 	hsuc = &chip->hsu->chan[nr];
 
···
 	}
 	spin_unlock_irqrestore(&hsuc->vchan.lock, flags);
 
-	return IRQ_HANDLED;
+	return 1;
 }
 EXPORT_SYMBOL_GPL(hsu_dma_do_irq);
 

drivers/dma/hsu/pci.c

···
 	u32 dmaisr;
 	u32 status;
 	unsigned short i;
-	irqreturn_t ret = IRQ_NONE;
+	int ret = 0;
 	int err;
 
 	dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
···
 		if (dmaisr & 0x1) {
 			err = hsu_dma_get_status(chip, i, &status);
 			if (err > 0)
-				ret |= IRQ_HANDLED;
+				ret |= 1;
 			else if (err == 0)
 				ret |= hsu_dma_do_irq(chip, i, status);
 		}
 		dmaisr >>= 1;
 	}
 
-	return ret;
+	return IRQ_RETVAL(ret);
 }
 
 static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)

drivers/tty/serial/8250/8250_mid.c

···
 	struct uart_8250_port *up = up_to_u8250p(p);
 	unsigned int fisr = serial_port_in(p, INTEL_MID_UART_DNV_FISR);
 	u32 status;
-	int ret = IRQ_NONE;
+	int ret = 0;
 	int err;
 
 	if (fisr & BIT(2)) {
 		err = hsu_dma_get_status(&mid->dma_chip, 1, &status);
 		if (err > 0) {
 			serial8250_rx_dma_flush(up);
-			ret |= IRQ_HANDLED;
+			ret |= 1;
 		} else if (err == 0)
 			ret |= hsu_dma_do_irq(&mid->dma_chip, 1, status);
 	}
 	if (fisr & BIT(1)) {
 		err = hsu_dma_get_status(&mid->dma_chip, 0, &status);
 		if (err > 0)
-			ret |= IRQ_HANDLED;
+			ret |= 1;
 		else if (err == 0)
 			ret |= hsu_dma_do_irq(&mid->dma_chip, 0, status);
 	}
 	if (fisr & BIT(0))
 		ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR));
-	return ret;
+	return IRQ_RETVAL(ret);
 }
 
 #define DNV_DMA_CHAN_OFFSET 0x80

include/linux/dma/hsu.h

···
 /* Export to the internal users */
 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr,
 		       u32 *status);
-irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
-			   u32 status);
+int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status);
 
 /* Export to the platform drivers */
 int hsu_dma_probe(struct hsu_dma_chip *chip);
···
 {
 	return 0;
 }
-static inline irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip,
-					 unsigned short nr, u32 status)
+static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
+				 u32 status)
 {
-	return IRQ_NONE;
+	return 0;
 }
 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; }
 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; }