gpio: pl061: fix IRQ handling for GPIOs >= PL061_GPIO_NR

IRQ handling is wrong for any GPIO >= PL061_GPIO_NR.

Fix this by implementing and using a proper .to_irq method.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
index 80e483986699..4ee4c8367a3f 100644
--- a/drivers/gpio/pl061.c
+++ b/drivers/gpio/pl061.c
@@ -109,6 +109,16 @@ static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
         writeb(!!value << offset, chip->base + (1 << (offset + 2)));
 }
 
+static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+        if (chip->irq_base == (unsigned) -1)
+                return -EINVAL;
+
+        return chip->irq_base + offset;
+}
+
 /*
  * PL061 GPIO IRQ
  */
@@ -200,7 +210,7 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
         desc->chip->ack(irq);
         list_for_each(ptr, chip_list) {
                 unsigned long pending;
-                int gpio;
+                int offset;
 
                 chip = list_entry(ptr, struct pl061_gpio, list);
                 pending = readb(chip->base + GPIOMIS);
@@ -209,8 +219,8 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
                 if (pending == 0)
                         continue;
 
-                for_each_bit(gpio, &pending, PL061_GPIO_NR)
-                        generic_handle_irq(gpio_to_irq(gpio));
+                for_each_bit(offset, &pending, PL061_GPIO_NR)
+                        generic_handle_irq(pl061_to_irq(&chip->gc, offset));
         }
         desc->chip->unmask(irq);
 }
@@ -251,6 +261,7 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id)
         chip->gc.direction_output = pl061_direction_output;
         chip->gc.get = pl061_get_value;
         chip->gc.set = pl061_set_value;
+        chip->gc.to_irq = pl061_to_irq;
         chip->gc.base = pdata->gpio_base;
         chip->gc.ngpio = PL061_GPIO_NR;
         chip->gc.label = dev_name(&dev->dev);