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mfd: Micro-optimization on twl4030 IRQ handler 

__ffs() will be far faster than the for loop used.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Felipe Balbi 2012-02-22 14:53:59 +02:00 committed by Samuel Ortiz
parent f01b1f90bf
commit 5a903090e7
1 changed files with 7 additions and 7 deletions
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14
drivers/mfd/twl4030-irq.c
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@ -293,7 +293,6 @@ static unsigned twl4030_irq_base;
*/
static irqreturn_t handle_twl4030_pih(int irq, void *devid)
{
int module_irq;
irqreturn_t ret;
u8 pih_isr;
@ -304,12 +303,13 @@ static irqreturn_t handle_twl4030_pih(int irq, void *devid)
return IRQ_NONE;
}
/* these handlers deal with the relevant SIH irq status */
for (module_irq = twl4030_irq_base;
pih_isr;
pih_isr >>= 1, module_irq++) {
if (pih_isr & 0x1)
handle_nested_irq(module_irq);
while (pih_isr) {
unsigned long pending = __ffs(pih_isr);
unsigned int irq;
pih_isr &= ~BIT(pending);
irq = pending + twl4030_irq_base;
handle_nested_irq(irq);
}
return IRQ_HANDLED;