[PATCH] device-mapper: Fix dm_swap_table error cases

Fix dm_swap_table() __bind error cases: a missing unlock, and EINVAL
preferable to EPERM.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 8 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index bb3ad79c14d7..54fabbf06678 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -966,23 +966,20 @@ static void __flush_deferred_io(struct mapped_device *md, struct bio *c)
  */
 int dm_swap_table(struct mapped_device *md, struct dm_table *table)
 {
-        int r;
+        int r = -EINVAL;
 
         down_write(&md->lock);
 
         /* device must be suspended */
-        if (!test_bit(DMF_SUSPENDED, &md->flags)) {
-                up_write(&md->lock);
-                return -EPERM;
-        }
+        if (!test_bit(DMF_SUSPENDED, &md->flags))
+                goto out;
 
         __unbind(md);
         r = __bind(md, table);
-        if (r)
-                return r;
 
+out:
         up_write(&md->lock);
-        return 0;
+        return r;
 }
 
 /*