Commits
NeilBrown committed 3f232d6a95f
md/raid5: add rcu protection to rdev accesses in want_replace Being in the middle of resync is no longer protection against failed rdevs disappearing. So add rcu protection. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>