From 1536cc0d55a2820b71daf912060fe43ec15630c2 Mon Sep 17 00:00:00 2001 From: "Denis V. Lunev" Date: Wed, 10 Oct 2007 21:12:58 -0700 Subject: [PATCH] [NET]: rtnl_unlock cleanups There is no need to process outstanding netlink user->kernel packets during rtnl_unlock now. There is no rtnl_trylock in the rtnetlink_rcv anymore. Normal code path is the following: netlink_sendmsg netlink_unicast netlink_sendskb skb_queue_tail netlink_data_ready rtnetlink_rcv mutex_lock(&rtnl_mutex); netlink_run_queue(sk, qlen, &rtnetlink_rcv_msg); mutex_unlock(&rtnl_mutex); So, it is possible, that packets can be present in the rtnl->sk_receive_queue during rtnl_unlock, but there is no need to process them at that moment as rtnetlink_rcv for that packet is pending. Signed-off-by: Denis V. Lunev Acked-by: Alexey Kuznetsov Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 739fbad15c6a..471d2d9f8eae 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -75,8 +75,6 @@ void __rtnl_unlock(void) void rtnl_unlock(void) { mutex_unlock(&rtnl_mutex); - if (rtnl && rtnl->sk_receive_queue.qlen) - rtnl->sk_data_ready(rtnl, 0); netdev_run_todo(); } @@ -1319,11 +1317,9 @@ static void rtnetlink_rcv(struct sock *sk, int len) unsigned int qlen = 0; do { - mutex_lock(&rtnl_mutex); + rtnl_lock(); qlen = netlink_run_queue(sk, qlen, &rtnetlink_rcv_msg); - mutex_unlock(&rtnl_mutex); - - netdev_run_todo(); + rtnl_unlock(); } while (qlen); }