From 66af1e558538137080615e7ad6d1f2f80862de01 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 6 Nov 2007 10:18:36 -0500 Subject: SUNRPC: Fix a race in xs_tcp_state_change() When scheduling the autoclose RPC call, we want to ensure that we don't race against the test_bit() call in xprt_clear_locked(). Signed-off-by: Trond Myklebust --- net/sunrpc/xprt.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'net/sunrpc/xprt.c') diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index fb92f51405c5..a3af02168af1 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -570,6 +570,7 @@ static void xprt_autoclose(struct work_struct *work) xprt_disconnect(xprt); xprt->ops->close(xprt); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); xprt_release_write(xprt, NULL); } @@ -588,6 +589,25 @@ void xprt_disconnect(struct rpc_xprt *xprt) } EXPORT_SYMBOL_GPL(xprt_disconnect); +/** + * xprt_force_disconnect - force a transport to disconnect + * @xprt: transport to disconnect + * + */ +void xprt_force_disconnect(struct rpc_xprt *xprt) +{ + /* Don't race with the test_bit() in xprt_clear_locked() */ + spin_lock_bh(&xprt->transport_lock); + set_bit(XPRT_CLOSE_WAIT, &xprt->state); + /* Try to schedule an autoclose RPC call */ + if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) + queue_work(rpciod_workqueue, &xprt->task_cleanup); + else if (xprt->snd_task != NULL) + rpc_wake_up_task(xprt->snd_task); + spin_unlock_bh(&xprt->transport_lock); +} +EXPORT_SYMBOL_GPL(xprt_force_disconnect); + static void xprt_init_autodisconnect(unsigned long data) { -- cgit v1.2.2