linux-kernel - Re: [PATCH v3 2/6] floppy: do put_disk on current dr if blk_init

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Date:	Tue, 14 Aug 2012 15:48:35 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>
Subject: Re: [PATCH v3 2/6] floppy: do put_disk on current dr if
 blk_init_queue fails

On Mon, Aug 13, 2012 at 03:16:23PM -0300, Herton Ronaldo Krzesinski wrote:
> If blk_init_queue fails, we do not call put_disk on the current dr
> (dr is decremented first in the error handling loop).
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
> ---
>  drivers/block/floppy.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
> index c8d9e68..1e09e99 100644
> --- a/drivers/block/floppy.c
> +++ b/drivers/block/floppy.c
> @@ -4151,6 +4151,7 @@ static int __init do_floppy_init(void)
>  
>  		disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
>  		if (!disks[dr]->queue) {
> +			put_disk(disks[dr]);
>  			err = -ENOMEM;
>  			goto out_put_disk;
>  		}

I think it will create conflict with patch 6. Will it not call put_disk()
twice on disks[dr].

Why are we retaining this patch given the fact that we will loop through
all the drives and queues in out_put_disk.

Thanks
Vivek
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