[PATCH 3.12 033/144] aio: fix kioctx leak introduced by "aio: Fix a trinity splat"

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin LaHaise <bcrl@kvack.org>

commit 1881686f842065d2f92ec9c6424830ffc17d23b0 upstream.

e34ecee2ae791df674dfb466ce40692ca6218e43 reworked the percpu reference
counting to correct a bug trinity found.  Unfortunately, the change lead
to kioctxes being leaked because there was no final reference count to
put.  Add that reference count back in to fix things.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/aio.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/aio.c
+++ b/fs/aio.c

@@ -652,7 +652,8 @@ static struct kioctx *ioctx_alloc(unsign
 	aio_nr += ctx->max_reqs;
 	spin_unlock(&aio_nr_lock);
 
-	percpu_ref_get(&ctx->users); /* io_setup() will drop this ref */
+	percpu_ref_get(&ctx->users);	/* io_setup() will drop this ref */
+	percpu_ref_get(&ctx->reqs);	/* free_ioctx_users() will drop this */
 
 	err = ioctx_add_table(ctx, mm);
 	if (err)