xfrm: Fix xfrm_policy_gc_lock handling.

From: Alexey Dobriyan <adobriyan@gmail.com>

Based upon a lockdep trace by Simon Arlott.

xfrm_policy_kill() can be called from both BH and
non-BH contexts, so we have to grab xfrm_policy_gc_lock
with BH disabling.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 25872747762c..058f04f54b90 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -315,9 +315,9 @@ static void xfrm_policy_kill(struct xfrm_policy *policy)
                 return;
         }
 
-        spin_lock(&xfrm_policy_gc_lock);
+        spin_lock_bh(&xfrm_policy_gc_lock);
         hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
-        spin_unlock(&xfrm_policy_gc_lock);
+        spin_unlock_bh(&xfrm_policy_gc_lock);
 
         schedule_work(&xfrm_policy_gc_work);
 }