linux-kernel - Re: [PATCH 2/6] block: loop: don't hold lo_ctl_mutex in lo

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Date:	Mon, 6 Apr 2015 07:49:51 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jarod Wilson <jarod@...hat.com>,
	David Herrmann <dh.herrmann@...il.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	"nbd-general@...ts.sourceforge.net" 
	<nbd-general@...ts.sourceforge.net>,
	Stefan Haberland <stefan.haberland@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Fabian Frederick <fabf@...net.be>, linux-s390@...r.kernel.org
Subject: Re: [PATCH 2/6] block: loop: don't hold lo_ctl_mutex in lo_open

On Mon, Apr 06, 2015 at 12:28:22AM +0800, Ming Lei wrote:
> Another simpler way is to make lo_refcnt as atomic_t and remove
> lo_ctrl_mutext in lo_open(), and freeze request queue during clearing
> fd, and better to freeze queue during setting fd too, so will update in
> v1 with this way.

Using an atomic_t sounds good to me.
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