[ARM] 3347/1: Bugfix for ixp4xx_set_irq_type()

Patch from Mårten Wikström

This patch fixes a bug in ixp4xx_set_irq_type() which leads to
GPIO being incorrectly set to both edge triggered for raising
as well as falling edge interrupt types. See the previous
discussion on patch 3312/1.

Signed-off-by: Mårten Wikström <marten.wikstrom@passito.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 13 insertions, 7 deletions

diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 4bdc9d4526cd..fbadf3021b9e 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -111,24 +111,30 @@ static int ixp4xx_set_irq_type(unsigned int irq, unsigned int type)
         if (line < 0)
                 return -EINVAL;
 
-        if (type & IRQT_BOTHEDGE) {
+        switch (type){
+        case IRQT_BOTHEDGE:
                 int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
                 irq_type = IXP4XX_IRQ_EDGE;
-        } else  if (type & IRQT_RISING) {
+                break;
+        case IRQT_RISING:
                 int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
                 irq_type = IXP4XX_IRQ_EDGE;
-        } else if (type & IRQT_FALLING) {
+                break;
+        case IRQT_FALLING:
                 int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
                 irq_type = IXP4XX_IRQ_EDGE;
-        } else if (type & IRQT_HIGH) {
+                break;
+        case IRQT_HIGH:
                 int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
                 irq_type = IXP4XX_IRQ_LEVEL;
-        } else if (type & IRQT_LOW) {
+                break;
+        case IRQT_LOW:
                 int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
                 irq_type = IXP4XX_IRQ_LEVEL;
-        } else
+                break;
+        default:
                 return -EINVAL;
-
+        }
         ixp4xx_config_irq(irq, irq_type);
 
         if (line >= 8) {        /* pins 8-15 */