linux-kernel - Re: [PATCH v2] block: wrong return value

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Message-ID: <54492840.9050704@kernel.dk>
Date:	Thu, 23 Oct 2014 10:09:36 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] block: wrong return value

On 10/23/2014 10:04 AM, 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.
> 
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
> 
> change in v2: added elevator_put
> 
>  block/elevator.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/block/elevator.c b/block/elevator.c
> index 24c28b6..1267c2b 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -184,7 +184,7 @@ static void elevator_release(struct kobject *kobj)
>  int elevator_init(struct request_queue *q, char *name)
>  {
>  	struct elevator_type *e = NULL;
> -	int err;
> +	int err = 0;

Why init it to 0?

-- 
Jens Axboe

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