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gpio/langwell_gpio: ack the correct bit for langwell gpio interrupts

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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
732063b92b

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Mathias Nyman 2011-07-08 10:02:18 +01:00 committed by Grant Likely
parent 58956ba23e
commit 2345b20fd9
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/langwell_gpio.c
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@ -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 */