[PATCH] gpio: langwell_gpio: ack the correct bit for langwell gpiointerrupts

From: Alan Cox
Date: Fri Jul 08 2011 - 05:02:01 EST


From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>

The wrong bit was masked when acking langwell gpio interrupts.

Reason for maskig the wrong bit was probably because__ffs() and ffs() functions
return bit indexes differently (0..31 vs 1..32)

This fixes langwell based devices from hanging when a gpio interrupt is
triggered and undoes the breakage which occurred in change set
732063b92bb727b27e61580ce278dddefe31c6ad

Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---

drivers/gpio/langwell_gpio.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/drivers/gpio/langwell_gpio.c b/drivers/gpio/langwell_gpio.c
index bd6571e..644ba12 100644
--- a/drivers/gpio/langwell_gpio.c
+++ b/drivers/gpio/langwell_gpio.c
@@ -223,7 +223,7 @@ static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
gedr = gpio_reg(&lnw->chip, base, GEDR);
pending = readl(gedr);
while (pending) {
- gpio = __ffs(pending) - 1;
+ gpio = __ffs(pending);
mask = BIT(gpio);
pending &= ~mask;
/* Clear before handling so we can't lose an edge */

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