[SCSI] hpsa: use find_first_zero_bit

Use find_first_zero_bit to find the first cleared bit in a memory region.

This also includes the following minor changes.
- Use bitmap_zero
- Reduce unnecessary atomic bitops usage

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 13195072b234..5019bea323ce 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -579,21 +579,19 @@ static int hpsa_find_target_lun(struct ctlr_info *h,
         int i, found = 0;
         DECLARE_BITMAP(lun_taken, HPSA_MAX_DEVICES);
 
-        memset(&lun_taken[0], 0, HPSA_MAX_DEVICES >> 3);
+        bitmap_zero(lun_taken, HPSA_MAX_DEVICES);
 
         for (i = 0; i < h->ndevices; i++) {
                 if (h->dev[i]->bus == bus && h->dev[i]->target != -1)
-                        set_bit(h->dev[i]->target, lun_taken);
+                        __set_bit(h->dev[i]->target, lun_taken);
         }
 
-        for (i = 0; i < HPSA_MAX_DEVICES; i++) {
-                if (!test_bit(i, lun_taken)) {
-                        /* *bus = 1; */
-                        *target = i;
-                        *lun = 0;
-                        found = 1;
-                        break;
-                }
+        i = find_first_zero_bit(lun_taken, HPSA_MAX_DEVICES);
+        if (i < HPSA_MAX_DEVICES) {
+                /* *bus = 1; */
+                *target = i;
+                *lun = 0;
+                found = 1;
         }
         return !found;
 }