linux-kernel - Re: [PATCH v3] block: wrong return value

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Date:	Tue, 28 Oct 2014 22:52:34 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] block: wrong return value

On Thu, Oct 23, 2014 at 10:16:48PM +0530, Sudip Mukherjee wrote:
> while compiling integer err was showing as a set but unused variable.
> elevator_init_fn can be either cfq_init_queue or deadline_init_queue
> or noop_init_queue.
> all three of these functions are returning -ENOMEM if they fail to
> allocate the queue.
> so we should actually be returning the error code rather than
> returning 0 always.
i have one doubt. shouldn't this patch be marked for stable also?

thanks
sudip
> 
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
> 
> change in v2: added elevator_put
> change in v3: remove unneeded initialization of err
> 
>  block/elevator.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/block/elevator.c b/block/elevator.c
> index 24c28b6..afa3b03 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -229,7 +229,9 @@ int elevator_init(struct request_queue *q, char *name)
>  	}
>  
>  	err = e->ops.elevator_init_fn(q, e);
> -	return 0;
> +	if (err)
> +		elevator_put(e);
> +	return err;
>  }
>  EXPORT_SYMBOL(elevator_init);
>  
> -- 
> 1.8.1.2
> 
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