linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Hold struct

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Message-ID: <20110727090331.60e0c5be@jbarnes-desktop>
Date:	Wed, 27 Jul 2011 09:03:31 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...hat.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Hold struct_mutex during hotplug
 processing

On Wed, 27 Jul 2011 02:21:24 -0700
Keith Packard <keithp@...thp.com> wrote:

> On Tue, 26 Jul 2011 12:12:25 -0700, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> 
> > I'd like to amend my reviewed by and say the lock shouldn't be held
> > around the call to the drm helper function.  It queues some work that
> > also takes the mode config lock, which will break.  So you can drop it
> > before that...  Previously I had only checked our internal driver
> > callbacks but missed that the lock was held across the helper too.
> 
> So the work may get executed immediately rather than being run later at
> some point?

It sure looks that way... but I don't remember any rule about work
queue items having inter dependencies like this.

-- 
Jesse Barnes, Intel Open Source Technology Center
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