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

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Date:	Thu, 23 Oct 2014 20:38:05 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: wrong return value

On Thu, Oct 23, 2014 at 08:12:06AM -0600, Jens Axboe wrote:
> On 10/23/2014 07:20 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.
> 
> That does look weird. You need an elevator_put() in the error case,
> though, ala:
> 
oops.. sorry i missed that elevator_get in the code.
I will send you v2 of the patch.

thanks
sudip

> err = e->ops.elevator_init_fn(q, e);
> if (err)
> 	elevator_put(e);
> 
> return err;
> 
> 
> -- 
> Jens Axboe
> 
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