From: Yu Kuai yukuai3@huawei.com
[ Upstream commit 7d5fff8982a2199d49ec067818af7d84d4f95ca0 ]
__md_stop_writes() and __md_stop() will modify many fields that are protected by 'reconfig_mutex', and all the callers will grab 'reconfig_mutex' except for md_stop().
Also, update md_stop() to make certain 'reconfig_mutex' is held using lockdep_assert_held().
Fixes: 9d09e663d550 ("dm: raid456 basic support") Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Mike Snitzer snitzer@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/dm-raid.c | 4 +++- drivers/md/md.c | 2 ++ 2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 6d4e287350a33..8d489933d5792 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -3305,8 +3305,8 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv) return 0;
bad_unlock: - mddev_unlock(&rs->md); md_stop(&rs->md); + mddev_unlock(&rs->md); bad: raid_set_free(rs);
@@ -3317,7 +3317,9 @@ static void raid_dtr(struct dm_target *ti) { struct raid_set *rs = ti->private;
+ mddev_lock_nointr(&rs->md); md_stop(&rs->md); + mddev_unlock(&rs->md); raid_set_free(rs); }
diff --git a/drivers/md/md.c b/drivers/md/md.c index 5a21aeedc1ba7..89a270d293698 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6281,6 +6281,8 @@ static void __md_stop(struct mddev *mddev)
void md_stop(struct mddev *mddev) { + lockdep_assert_held(&mddev->reconfig_mutex); + /* stop the array and free an attached data structures. * This is called from dm-raid */