linux-kernel - Re: [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and

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Message-ID: <20111019132657.GA1140@redhat.com>
Date:	Wed, 19 Oct 2011 09:26:57 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, ctalbott@...gle.com,
	ni@...gle.com
Subject: Re: [PATCH 02/10] block: fix genhd refcounting in
 blkio_policy_parse_and_set()

On Tue, Oct 18, 2011 at 09:26:16PM -0700, Tejun Heo wrote:
> blkio_policy_parse_and_set() calls blkio_check_dev_num() to check
> whether the given dev_t is valid.  blkio_check_dev_num() uses
> get_gendisk() for verification but never puts the returned genhd
> leaking the reference.
> 
> This patch collapses blkio_check_dev_num() into its caller and updates
> it such that the genhd is put before returning.

Hi Tejun,

What's the advantage of collapsing blkio_check_dev_num(). Why not put the
reference to gendisk in this function before returning either success or
failure.

Thanks
Vivek
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