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authorEric Dumazet <eric.dumazet@gmail.com>2010-05-26 19:20:18 +0000
committerDavid S. Miller <davem@davemloft.net>2010-05-27 00:30:53 -0700
commit8a74ad60a546b13bd1096b2a61a7a5c6fd9ae17c (patch)
tree3110e7e59883597b5d0f617e8507e15b8f965f3f /net/core/datagram.c
parentnet/iucv: Add missing spin_unlock (diff)
downloadlinux-dev-8a74ad60a546b13bd1096b2a61a7a5c6fd9ae17c.tar.xz
linux-dev-8a74ad60a546b13bd1096b2a61a7a5c6fd9ae17c.zip
net: fix lock_sock_bh/unlock_sock_bh
This new sock lock primitive was introduced to speedup some user context socket manipulation. But it is unsafe to protect two threads, one using regular lock_sock/release_sock, one using lock_sock_bh/unlock_sock_bh This patch changes lock_sock_bh to be careful against 'owned' state. If owned is found to be set, we must take the slow path. lock_sock_bh() now returns a boolean to say if the slow path was taken, and this boolean is used at unlock_sock_bh time to call the appropriate unlock function. After this change, BH are either disabled or enabled during the lock_sock_bh/unlock_sock_bh protected section. This might be misleading, so we rename these functions to lock_sock_fast()/unlock_sock_fast(). Reported-by: Anton Blanchard <anton@samba.org> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Tested-by: Anton Blanchard <anton@samba.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/datagram.c')
-rw-r--r--net/core/datagram.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c
index e0097531417a..f5b6f43a4c2e 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -229,15 +229,17 @@ EXPORT_SYMBOL(skb_free_datagram);
void skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb)
{
+ bool slow;
+
if (likely(atomic_read(&skb->users) == 1))
smp_rmb();
else if (likely(!atomic_dec_and_test(&skb->users)))
return;
- lock_sock_bh(sk);
+ slow = lock_sock_fast(sk);
skb_orphan(skb);
sk_mem_reclaim_partial(sk);
- unlock_sock_bh(sk);
+ unlock_sock_fast(sk, slow);
/* skb is now orphaned, can be freed outside of locked section */
__kfree_skb(skb);