From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 15 Mar 2011 23:56:30 +0000 (-0400)
Subject: SUNRPC: Ensure we always run the tk_callback before tk_action
X-Git-Tag: v3.0~1553^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e020c6800c9621a77223bf2c1ff68180e41e8ebf;p=platform%2Fkernel%2Flinux-amlogic.git

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 <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
---

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 5681c6a..2e9387b 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);