linux-kernel - [54/94] sunrpc: clarify comments on rpc_make

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Date:	Tue, 28 May 2013 04:49:53 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Jeff Layton" <jlayton@...hat.com>,
	"Trond Myklebust" <Trond.Myklebust@...app.com>
Subject: [54/94] sunrpc: clarify comments on rpc_make_runnable

3.2.46-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Layton <jlayton@...hat.com>

commit 506026c3ec270e18402f0c9d33fee37482c23861 upstream.

rpc_make_runnable is not generally called with the queue lock held, unless
it's waking up a task that has been sitting on a waitqueue. This is safe
when the task has not entered the FSM yet, but the comments don't really
spell this out.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/sunrpc/sched.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -296,8 +296,9 @@ EXPORT_SYMBOL_GPL(__rpc_wait_for_complet
 /*
  * Make an RPC task runnable.
  *
- * Note: If the task is ASYNC, this must be called with
- * the spinlock held to protect the wait queue operation.
+ * Note: If the task is ASYNC, and is being made runnable after sitting on an
+ * rpc_wait_queue, this must be called with the queue spinlock held to protect
+ * the wait queue operation.
  */
 static void rpc_make_runnable(struct rpc_task *task)
 {

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