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 <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 15 insertions, 17 deletions

diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c
index c5f21efd6090..29d04ca71d52 100644
--- a/drivers/dma/hsu/hsu.c
+++ b/drivers/dma/hsu/hsu.c
@@ -200,10 +200,9 @@ EXPORT_SYMBOL_GPL(hsu_dma_get_status);
  *      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;
@@ -211,7 +210,7 @@ irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
 
         /* Sanity check */
         if (nr >= chip->hsu->nr_channels)
-                return IRQ_NONE;
+                return 0;
 
         hsuc = &chip->hsu->chan[nr];
 
@@ -230,7 +229,7 @@ irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
         }
         spin_unlock_irqrestore(&hsuc->vchan.lock, flags);
 
-        return IRQ_HANDLED;
+        return 1;
 }
 EXPORT_SYMBOL_GPL(hsu_dma_do_irq);
 
diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c
index 9916058531d9..b51639f045ed 100644
--- a/drivers/dma/hsu/pci.c
+++ b/drivers/dma/hsu/pci.c
@@ -29,7 +29,7 @@ static irqreturn_t hsu_pci_irq(int irq, void *dev)
         u32 dmaisr;
         u32 status;
         unsigned short i;
-        irqreturn_t ret = IRQ_NONE;
+        int ret = 0;
         int err;
 
         dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
@@ -37,14 +37,14 @@ static irqreturn_t hsu_pci_irq(int irq, void *dev)
                 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)
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 339de9cd0866..121a7f2d4697 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -99,27 +99,27 @@ static int dnv_handle_irq(struct uart_port *p)
         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
diff --git a/include/linux/dma/hsu.h b/include/linux/dma/hsu.h
index aaff68efba5d..197eec63e501 100644
--- a/include/linux/dma/hsu.h
+++ b/include/linux/dma/hsu.h
@@ -41,8 +41,7 @@ struct hsu_dma_chip {
 /* 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);
@@ -53,10 +52,10 @@ static inline int hsu_dma_get_status(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; }