From: "Denis V. Lunev" <[EMAIL PROTECTED]> Date: Fri, 5 Oct 2007 18:48:44 +0400
> This patch make processing netlink user -> kernel messages synchronious. > This change was inspired by the talk with Alexey Kuznetsov about current > netlink messages processing. He says that he was badly wrong when introduced > asynchronious user -> kernel communication. > > The call netlink_unicast is the only path to send message to the kernel > netlink socket. But, unfortunately, it is also used to send data to the > user. > > Before this change the user message has been attached to the socket queue > and sk->sk_data_ready was called. The process has been blocked until all > pending messages were processed. The bad thing is that this processing > may occur in the arbitrary process context. > > This patch changes nlk->data_ready callback to get 1 skb and force packet > processing right in the netlink_unicast. > > Kernel -> user path in netlink_unicast remains untouched. > > EINTR processing for in netlink_run_queue was changed. It forces rtnl_lock > drop, but the process remains in the cycle until the message will be fully > processed. So, there is no need to use this kludges now. > > Signed-off-by: Denis V. Lunev <[EMAIL PROTECTED]> > Acked-by: Alexey Kuznetsov <[EMAIL PROTECTED]> Applied. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
