dm-raid: Fix WARN_ON_ONCE check for sync_thread in raid_resume

rm-raid devices will occasionally trigger the following warning when
being resumed after a table load because DM_RECOVERY_RUNNING is set:

WARNING: CPU: 7 PID: 5660 at drivers/md/dm-raid.c:4105 raid_resume+0xee/0x100 [dm_raid]

The failing check is:
WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));

This check is designed to make sure that the sync thread isn't
registered, but md_check_recovery can set MD_RECOVERY_RUNNING without
the sync_thread ever getting registered. Instead of checking if
MD_RECOVERY_RUNNING is set, check if sync_thread is non-NULL.

Fixes: 16c4770 ("dm-raid: really frozen sync_thread during suspend")
Suggested-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: bmarzins

drivers/md/dm-raid.c

@@ -4101,10 +4101,11 @@ static void raid_resume(struct dm_target *ti)
 		if (mddev->delta_disks < 0)
 			rs_set_capacity(rs);
 
+		mddev_lock_nointr(mddev);
 		WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery));
-		WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
+		WARN_ON_ONCE(rcu_dereference_protected(mddev->sync_thread,
+						       lockdep_is_held(&mddev->reconfig_mutex)));
 		clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags);
-		mddev_lock_nointr(mddev);
 		mddev->ro = 0;
 		mddev->in_sync = 0;
 		md_unfrozen_sync_thread(mddev);