[NET_SCHED]: ematch: module autoloading

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/sched/ematch.c b/net/sched/ematch.c
index 24837391640d..f3a104e323bd 100644
--- a/net/sched/ematch.c
+++ b/net/sched/ematch.c
@@ -222,6 +222,19 @@ static int tcf_em_validate(struct tcf_proto *tp,
 
                 if (em->ops == NULL) {
                         err = -ENOENT;
+#ifdef CONFIG_KMOD
+                        __rtnl_unlock();
+                        request_module("ematch-kind-%u", em_hdr->kind);
+                        rtnl_lock();
+                        em->ops = tcf_em_lookup(em_hdr->kind);
+                        if (em->ops) {
+                                /* We dropped the RTNL mutex in order to
+                                 * perform the module load. Tell the caller
+                                 * to replay the request. */
+                                module_put(em->ops->owner);
+                                err = -EAGAIN;
+                        }
+#endif
                         goto errout;
                 }