[PATCH] Decrease number of pointer derefs in multipath.c

Decrease the number of pointer derefs in drivers/md/multipath.c

Benefits of the patch:
 - Fewer pointer dereferences should make the code slightly faster.
 - Size of generated code is smaller
 - improved readability

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Alasdair G Kergon <agk@redhat.com>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index e6aa309a66d7..96f7af4ae400 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -303,6 +303,7 @@ static void print_multipath_conf (multipath_conf_t *conf)
 static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
 {
         multipath_conf_t *conf = mddev->private;
+        struct request_queue *q;
         int found = 0;
         int path;
         struct multipath_info *p;
@@ -311,8 +312,8 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
 
         for (path=0; path<mddev->raid_disks; path++) 
                 if ((p=conf->multipaths+path)->rdev == NULL) {
-                        blk_queue_stack_limits(mddev->queue,
-                                               rdev->bdev->bd_disk->queue);
+                        q = rdev->bdev->bd_disk->queue;
+                        blk_queue_stack_limits(mddev->queue, q);
 
                 /* as we don't honour merge_bvec_fn, we must never risk
                  * violating it, so limit ->max_sector to one PAGE, as
@@ -320,7 +321,7 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                  * (Note: it is very unlikely that a device with
                  * merge_bvec_fn will be involved in multipath.)
                  */
-                        if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
+                        if (q->merge_bvec_fn &&
                             mddev->queue->max_sectors > (PAGE_SIZE>>9))
                                 blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);