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

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Message-ID: <yun8vrmutxi.fsf@aiko.keithp.com>
Date:	Mon, 25 Jul 2011 10:55:05 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Andrew Lutomirski <luto@....edu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	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 Mon, 25 Jul 2011 13:40:58 -0400, Andrew Lutomirski <luto@....edu> wrote:

> Will test tonight.

Thanks. 

> It looks like there is a lot of hotplug activity when 'xset dpms force
> off' gets run.  (That's not a typo.  I do mean "off," not "on."

Yup, that's what I've seen as well -- do a mode set to turn stuff off
and you get spammed with hotplug events.

> See attached trace.  perf rocks, even over ssh :)

Wow. You're nested about three deep in the mode setting code due to
overlapping hotplug events. What could possibly go wrong?

Makes me optimistic that a bit of locking will help a lot here.

-- 
keith.packard@...el.com

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