From e020c6800c9621a77223bf2c1ff68180e41e8ebf Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 15 Mar 2011 19:56:30 -0400 Subject: SUNRPC: Ensure we always run the tk_callback before tk_action This fixes a race in which the task->tk_callback() puts the rpc_task to sleep, setting a new callback. Under certain circumstances, the current code may end up executing the task->tk_action before it gets round to the callback. Signed-off-by: Trond Myklebust Cc: stable@kernel.org --- net/sunrpc/sched.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 5681c6a12d2..2e9387b2384 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -630,14 +630,12 @@ static void __rpc_execute(struct rpc_task *task) save_callback = task->tk_callback; task->tk_callback = NULL; save_callback(task); - } - - /* - * Perform the next FSM step. - * tk_action may be NULL when the task has been killed - * by someone else. - */ - if (!RPC_IS_QUEUED(task)) { + } else { + /* + * Perform the next FSM step. + * tk_action may be NULL when the task has been killed + * by someone else. + */ if (task->tk_action == NULL) break; task->tk_action(task); -- cgit v1.2.3-18-g5258