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authorFelipe Balbi <balbi@ti.com>2012-02-22 16:53:59 +0400
committerSamuel Ortiz <sameo@linux.intel.com>2012-03-22 16:05:11 +0400
commit5a903090e7aa561901b7f052eb744b480d6126d4 (patch)
tree9bd5b024d34e30329f3b30bbb7bbbdaf80e640d7 /drivers/mfd/twl4030-irq.c
parentf01b1f90bf46ddaf2a68215a9489364c974e5689 (diff)
downloadlinux-5a903090e7aa561901b7f052eb744b480d6126d4.tar.xz
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>
Diffstat (limited to 'drivers/mfd/twl4030-irq.c')
-rw-r--r--drivers/mfd/twl4030-irq.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
index d6f3a5e9f7bd..3b748b71c0f3 100644
--- a/drivers/mfd/twl4030-irq.c
+++ b/drivers/mfd/twl4030-irq.c
@@ -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;