md/raid10: make more use of 'slot' in raid10d.

Now that we have a 'slot' variable, make better use of it to simplify
some code a little.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8e4f469..80cc7e6 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1650,8 +1650,8 @@ static void raid10d(mddev_t *mddev)
                        }
                        rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
 
-                       bio = r10_bio->devs[r10_bio->read_slot].bio;
-                       r10_bio->devs[r10_bio->read_slot].bio =
+                       bio = r10_bio->devs[slot].bio;
+                       r10_bio->devs[slot].bio =
                                mddev->ro ? IO_BLOCKED : NULL;
                        mirror = read_balance(conf, r10_bio);
                        if (mirror == -1) {
@@ -1665,6 +1665,7 @@ static void raid10d(mddev_t *mddev)
                        } else {
                                const unsigned long do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
                                bio_put(bio);
+                               slot = r10_bio->read_slot;
                                rdev = conf->mirrors[mirror].rdev;
                                if (printk_ratelimit())
                                        printk(KERN_ERR "md/raid10:%s: %s: redirecting sector %llu to"
@@ -1674,8 +1675,8 @@ static void raid10d(mddev_t *mddev)
                                               (unsigned long long)r10_bio->sector);
                                bio = bio_clone_mddev(r10_bio->master_bio,
                                                      GFP_NOIO, mddev);
-                               r10_bio->devs[r10_bio->read_slot].bio = bio;
-                               bio->bi_sector = r10_bio->devs[r10_bio->read_slot].addr
+                               r10_bio->devs[slot].bio = bio;
+                               bio->bi_sector = r10_bio->devs[slot].addr
                                        + rdev->data_offset;
                                bio->bi_bdev = rdev->bdev;
                                bio->bi_rw = READ | do_sync;