[PATCH v2] md/raid10: Remove rcu_dereference when it doesn't need rcu lock to protect

[Xiao Ni <xni@redhat.com>]

One warning message is triggered like this:
[  695.110751] =============================
[  695.131439] WARNING: suspicious RCU usage
[  695.151389] 4.18.0-319.el8.x86_64+debug #1 Not tainted
[  695.174413] -----------------------------
[  695.192603] drivers/md/raid10.c:1776 suspicious
rcu_dereference_check() usage!
[  695.225107] other info that might help us debug this:
[  695.260940] rcu_scheduler_active = 2, debug_locks = 1
[  695.290157] no locks held by mkfs.xfs/10186.

In the first loop of function raid10_handle_discard. It already
determines which disk need to handle discard request and add the
rdev reference count rdev->nr_pending. So the conf->mirrors will
not change until all bios come back from underlayer disks. It
doesn't need to use rcu_dereference to get rdev.

Fixes: d30588b2731f ('md/raid10: improve raid10 discard request')
Signed-off-by: Xiao Ni <xni@redhat.com>
Acked-by: Guoqing Jiang <guoqing.jiang@linux.dev>
---
V2: Fix comment style problem

 drivers/md/raid10.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 16977e8..d5d9233 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1712,6 +1712,11 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio)
 	} else
 		r10_bio->master_bio = (struct bio *)first_r10bio;
 
+	/*
+	 * first select target devices under rcu_lock and
+	 * inc refcount on their rdev.  Record them by setting
+	 * bios[x] to bio
+	 */
 	rcu_read_lock();
 	for (disk = 0; disk < geo->raid_disks; disk++) {
 		struct md_rdev *rdev = rcu_dereference(conf->mirrors[disk].rdev);
@@ -1743,9 +1748,6 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio)
 	for (disk = 0; disk < geo->raid_disks; disk++) {
 		sector_t dev_start, dev_end;
 		struct bio *mbio, *rbio = NULL;
-		struct md_rdev *rdev = rcu_dereference(conf->mirrors[disk].rdev);
-		struct md_rdev *rrdev = rcu_dereference(
-			conf->mirrors[disk].replacement);
 
 		/*
 		 * Now start to calculate the start and end address for each disk.
@@ -1775,9 +1777,12 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio)
 
 		/*
 		 * It only handles discard bio which size is >= stripe size, so
-		 * dev_end > dev_start all the time
+		 * dev_end > dev_start all the time.
+		 * It doesn't need to use rcu lock to get rdev here. We already
+		 * add rdev->nr_pending in the first loop.
 		 */
 		if (r10_bio->devs[disk].bio) {
+			struct md_rdev *rdev = conf->mirrors[disk].rdev;
 			mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
 			mbio->bi_end_io = raid10_end_discard_request;
 			mbio->bi_private = r10_bio;
@@ -1790,6 +1795,7 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio)
 			bio_endio(mbio);
 		}
 		if (r10_bio->devs[disk].repl_bio) {
+			struct md_rdev *rrdev = conf->mirrors[disk].replacement;
 			rbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
 			rbio->bi_end_io = raid10_end_discard_request;
 			rbio->bi_private = r10_bio;
-- 
2.7.5