[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 <[e-mail]>
Acked-by: Ingo Molnar <[e-mail]>
Cc: Alasdair G Kergon <[e-mail]>
Acked-by: NeilBrown <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/md/multipath.c

···
 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;
···
 
 	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
···
 		 * (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);