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

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Date:	Tue, 28 May 2013 06:14:35 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org,
	"Trond Myklebust" <Trond.Myklebust@...app.com>
Subject: Re: [54/94] sunrpc: clarify comments on rpc_make_runnable

On Tue, 28 May 2013 04:49:53 +0100
Ben Hutchings <ben@...adent.org.uk> wrote:

> 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)
>  {
> 

Just a comment patch, so this is harmless and I have no objection but
why pull it into stable? I had always thought stable-kernel-rules.txt
discouraged taking patches that don't fix real bugs...

-- 
Jeff Layton <jlayton@...hat.com>
--
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