Commit 354b445b authored by Shaohua Li's avatar Shaohua Li
Browse files

raid5-cache: fix lockdep warning 



lockdep reports warning of the rcu_dereference usage. Using normal rdev
access pattern to avoid the warning.

Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 6119e679

drivers/md/raid5-cache.c

+14 −2
Original line number Diff line number Diff line
@@ -970,16 +970,28 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 
			continue;



		/* in case device is broken */

		rcu_read_lock();

		rdev = rcu_dereference(conf->disks[disk_index].rdev);

		if (rdev)

		if (rdev) {

			atomic_inc(&rdev->nr_pending);

			rcu_read_unlock();

			sync_page_io(rdev, stripe_sect, PAGE_SIZE,

				     sh->dev[disk_index].page, REQ_OP_WRITE, 0,

				     false);

			rdev_dec_pending(rdev, rdev->mddev);

			rcu_read_lock();

		}

		rrdev = rcu_dereference(conf->disks[disk_index].replacement);

		if (rrdev)

		if (rrdev) {

			atomic_inc(&rrdev->nr_pending);

			rcu_read_unlock();

			sync_page_io(rrdev, stripe_sect, PAGE_SIZE,

				     sh->dev[disk_index].page, REQ_OP_WRITE, 0,

				     false);

			rdev_dec_pending(rrdev, rrdev->mddev);

			rcu_read_lock();

		}

		rcu_read_unlock();

	}

	raid5_release_stripe(sh);

	return 0;