[PATCH v4 10/11] macintosh/via-pmu: Clean up interrupt statistics

[Finn Thain]

Replace an open-coded ffs() with the function call.
Simplify an if-else cascade using a switch statement.
Correct a typo and an indentation issue.

Tested-by: Stan Johnson <user...@yahoo.com>
Signed-off-by: Finn Thain <fth...@telegraphics.com.au>
Reviewed-by: Geert Uytterhoeven <ge...@linux-m68k.org>
---
 drivers/macintosh/via-pmu.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index a68e7a6f00cc..3da5d40309d4 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -1355,7 +1355,8 @@ pmu_resume(void)
 static void
 pmu_handle_data(unsigned char *data, int len)
 {
-       unsigned char ints, pirq;
+       unsigned char ints;
+       int idx;
        int i = 0;
 
        asleep = 0;
@@ -1377,25 +1378,24 @@ pmu_handle_data(unsigned char *data, int len)
                ints &= ~(PMU_INT_ADB_AUTO | PMU_INT_AUTO_SRQ_POLL);
 
 next:
-
        if (ints == 0) {
                if (i > pmu_irq_stats[10])
                        pmu_irq_stats[10] = i;
                return;
        }
-
-       for (pirq = 0; pirq < 8; pirq++)
-               if (ints & (1 << pirq))
-                       break;
-       pmu_irq_stats[pirq]++;
        i++;
-       ints &= ~(1 << pirq);
+
+       idx = ffs(ints) - 1;
+       ints &= ~BIT(idx);
+
+       pmu_irq_stats[idx]++;
 
        /* Note: for some reason, we get an interrupt with len=1,
         * data[0]==0 after each normal ADB interrupt, at least
         * on the Pismo. Still investigating...  --BenH
         */
-       if ((1 << pirq) & PMU_INT_ADB) {
+       switch (BIT(idx)) {
+       case PMU_INT_ADB:
                if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
                        struct adb_request *req = req_awaiting_reply;
                        if (!req) {
@@ -1433,25 +1433,28 @@ pmu_handle_data(unsigned char *data, int len)
                                adb_input(data+1, len-1, 1);
 #endif /* CONFIG_ADB */                
                }
-       }
+               break;
+
        /* Sound/brightness button pressed */
-       else if ((1 << pirq) & PMU_INT_SNDBRT) {
+       case PMU_INT_SNDBRT:
 #ifdef CONFIG_PMAC_BACKLIGHT
                if (len == 3)
                        pmac_backlight_set_legacy_brightness_pmu(data[1] >> 4);
 #endif
-       }
+               break;
+
        /* Tick interrupt */
-       else if ((1 << pirq) & PMU_INT_TICK) {
-               /* Environement or tick interrupt, query batteries */
+       case PMU_INT_TICK:
+               /* Environment or tick interrupt, query batteries */
                if (pmu_battery_count) {
                        if ((--query_batt_timer) == 0) {
                                query_battery_state();
                                query_batt_timer = BATTERY_POLLING_COUNT;
                        }
                }
-        }
-       else if ((1 << pirq) & PMU_INT_ENVIRONMENT) {
+               break;
+
+       case PMU_INT_ENVIRONMENT:
                if (pmu_battery_count)
                        query_battery_state();
                pmu_pass_intr(data, len);
@@ -1461,7 +1464,9 @@ pmu_handle_data(unsigned char *data, int len)
                        via_pmu_event(PMU_EVT_POWER, !!(data[1]&8));
                        via_pmu_event(PMU_EVT_LID, data[1]&1);
                }
-       } else {
+               break;
+
+       default:
               pmu_pass_intr(data, len);
        }
        goto next;
-- 
2.16.4