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>

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;