[PATCH] md: Improve comments about locking situation in raid5 make_request

[linux-2.6-omap-h63xx.git] / drivers / md / dm-snap.c

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index a5765f9fbe02f2322a7993fe895bb009815b57f6..08312b46463aed866e88a8bbb9dd0bfa1340adaa 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -559,8 +559,12 @@ static void snapshot_dtr(struct dm_target *ti)
 {
        struct dm_snapshot *s = (struct dm_snapshot *) ti->private;
 
+       /* Prevent further origin writes from using this snapshot. */
+       /* After this returns there can be no new kcopyd jobs. */
        unregister_snapshot(s);
 
+       kcopyd_client_destroy(s->kcopyd_client);
+
        exit_exception_table(&s->pending, pending_cache);
        exit_exception_table(&s->complete, exception_cache);
 
@@ -569,7 +573,7 @@ static void snapshot_dtr(struct dm_target *ti)
 
        dm_put_device(ti, s->origin);
        dm_put_device(ti, s->cow);
-       kcopyd_client_destroy(s->kcopyd_client);
+
        kfree(s);
 }