md/raid1: Replace use of mddev->raid_disks with conf->raid_disks.

In general mddev->raid_disks can change unexpectedly while
conf->raid_disks will only change in a very controlled way.  So change
some uses of one to the other.

The use of mddev->raid_disks will not cause actually problems but
this way is more consistent and safer in the long term.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 4317f8de143a..ab8113cff7c9 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -277,7 +277,8 @@ static inline void update_head_pos(int disk, struct r1bio *r1_bio)
 static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio)
 {
         int mirror;
-        int raid_disks = r1_bio->mddev->raid_disks;
+        struct r1conf *conf = r1_bio->mddev->private;
+        int raid_disks = conf->raid_disks;
 
         for (mirror = 0; mirror < raid_disks; mirror++)
                 if (r1_bio->bios[mirror] == bio)
@@ -609,7 +610,7 @@ int md_raid1_congested(struct mddev *mddev, int bits)
                 return 1;
 
         rcu_read_lock();
-        for (i = 0; i < mddev->raid_disks; i++) {
+        for (i = 0; i < conf->raid_disks; i++) {
                 struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
                 if (rdev && !test_bit(Faulty, &rdev->flags)) {
                         struct request_queue *q = bdev_get_queue(rdev->bdev);
@@ -1286,7 +1287,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
         int mirror = 0;
         struct mirror_info *p;
         int first = 0;
-        int last = mddev->raid_disks - 1;
+        int last = conf->raid_disks - 1;
 
         if (mddev->recovery_disabled == conf->recovery_disabled)
                 return -EBUSY;