afs: add missing up_write() on return

If afs_cell_alloc() fails, afs_cells_sem doesn't get unlocked, which
leads to a deadlock.  Unlock it before returning.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 788865df1bc9..584bb0f9c36a 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -138,6 +138,7 @@ struct afs_cell *afs_cell_create(const char *name, char *vllist)
         cell = afs_cell_alloc(name, vllist);
         if (IS_ERR(cell)) {
                 _leave(" = %ld", PTR_ERR(cell));
+                up_write(&afs_cells_sem);
                 return cell;
         }