[PATCH 3.2 194/221] ematch: Fix auto-loading of ematch modules.

[Ben Hutchings]

3.2.69-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Ignacy GawÄdzki  <ignacy.gawedzki@xxxxxxxxxxxxxxxxxxxxxxx>

[ Upstream commit 34eea79e2664b314cab6a30fc582fdfa7a1bb1df ]

In tcf_em_validate(), after calling request_module() to load the
kind-specific module, set em->ops to NULL before returning -EAGAIN, so
that module_put() is not called again by tcf_em_tree_destroy().

Signed-off-by: Ignacy GawÄdzki <ignacy.gawedzki@xxxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Cong Wang <cwang@xxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/sched/ematch.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/sched/ematch.c
+++ b/net/sched/ematch.c
@@ -227,6 +227,7 @@ static int tcf_em_validate(struct tcf_pr
 				 * to replay the request.
 				 */
 				module_put(em->ops->owner);
+				em->ops = NULL;
 				err = -EAGAIN;
 			}
 #endif

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