linux-kernel - Re: [PATCH 2/3] loop: No need to initialize ->queue_lock explicitly before calling blk_cleanup

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Message-ID: <20110222073032.GA4555@swordfish.minsk.epam.com>
Date:	Tue, 22 Feb 2011 09:30:32 +0200
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com, neilb@...e.de,
	sergey.senozhatsky@...il.com, tj@...nel.org, jmoyer@...hat.com,
	snitzer@...hat.com
Subject: Re: [PATCH 2/3] loop: No need to initialize ->queue_lock explicitly
 before calling blk_cleanup_queue()

On (02/21/11 22:53), Vivek Goyal wrote:
> o Now we initialize ->queue_lock at queue allocation time so driver does
>   not have to worry about initializing it before calling blk_cleanup_queue().
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
> ---
>  drivers/block/loop.c |    3 ---
>  1 files changed, 0 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
> index 49e6a54..44e18c0 100644
> --- a/drivers/block/loop.c
> +++ b/drivers/block/loop.c
> @@ -1641,9 +1641,6 @@ out:
>  
>  static void loop_free(struct loop_device *lo)
>  {
> -	if (!lo->lo_queue->queue_lock)
> -		lo->lo_queue->queue_lock = &lo->lo_queue->__queue_lock;
> -
>  	blk_cleanup_queue(lo->lo_queue);
>  	put_disk(lo->lo_disk);
>  	list_del(&lo->lo_list);

Hi,

(just for note) 
There is an incremental patch fixing this case in Andrew's mm tree: 
https://lkml.org/lkml/2011/2/11/165
                                   
(block-fix-queue_lock-null-pointer-derefence-in-blk_throtl_exit-v4.patch
added to -mm tree).


        Sergey

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