From 15f081ca8ddfe150fb639c591b18944a539da0fc Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 11 Mar 2009 14:37:57 -0400 Subject: [PATCH] SUNRPC: Avoid an unnecessary task reschedule on ENOTCONN If the socket is unconnected, and xprt_transmit() returns ENOTCONN, we currently give up the lock on the transport channel. Doing so means that the lock automatically gets assigned to the next task in the xprt->sending queue, and so that task needs to be woken up to do the actual connect. The following patch aims to avoid that unnecessary task switch. Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 836f15c0c4a..07e9b05321e 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1105,14 +1105,24 @@ static void call_transmit_status(struct rpc_task *task) { task->tk_action = call_status; - /* - * Special case: if we've been waiting on the socket's write_space() - * callback, then don't call xprt_end_transmit(). - */ - if (task->tk_status == -EAGAIN) - return; - xprt_end_transmit(task); - rpc_task_force_reencode(task); + switch (task->tk_status) { + case -EAGAIN: + break; + default: + xprt_end_transmit(task); + /* + * Special cases: if we've been waiting on the + * socket's write_space() callback, or if the + * socket just returned a connection error, + * then hold onto the transport lock. + */ + case -ECONNREFUSED: + case -ENOTCONN: + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ENETUNREACH: + rpc_task_force_reencode(task); + } } /* -- 2.20.1