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[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 <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2007-10-10 21:12:58 -07:00 committed by David S. Miller
parent d1ec3b7722
commit 1536cc0d55
1 changed files with 2 additions and 6 deletions
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8
net/core/rtnetlink.c
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@ -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);
}