From: Daniel Vetter <daniel@ffwll.ch>
To: Ben Widawsky <ben@bwidawsk.net>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 3/3] drm/i915: close rps work vs. rps disable races
Date: Sun, 4 Sep 2011 21:57:31 +0200 [thread overview]
Message-ID: <20110904195731.GD2799@phenom.ffwll.local> (raw)
In-Reply-To: <20110904195008.GA17304@cloud01>
On Sun, Sep 04, 2011 at 07:50:08PM +0000, Ben Widawsky wrote:
> So I would rework some of your comments a bit, and I also think it's
> about time we create a central place to cancel workqueue items. Mostly
> because I think this patch is subject to a deadlock with struct_mutex
> (you're holding it when you call gen6_disable_rps(), but you're doing
> cancel_work_sync on a workqueue which attempts to acquire struct_mutex.
Oh dang, you're correct. This will deadlock. And the PMIMR is really just
cosmetic. So putting the cancel_work_sync into intel_modeset_cleanup
sounds like the right approach. And hey, I've already put other work
cancelling stuff there in my last fury at fixing module unload, so it
can't be that bad ;-)
I'll try to write a better patch tomorrow.
-Daniel
--
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48
next prev parent reply other threads:[~2011-09-04 19:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-04 3:24 [PATCH] drm/i915: Fix rps irq warning Ben Widawsky
2011-09-04 9:03 ` Chris Wilson
2011-09-04 15:49 ` Ben Widawsky
2011-09-04 15:34 ` [PATCH 0/3] slaughter rps races some more Daniel Vetter
2011-09-04 15:35 ` [PATCH 1/3] drm/i915: close PM interrupt masking races in the irq handler Daniel Vetter
2011-09-04 17:09 ` Ben Widawsky
2011-09-04 15:35 ` [PATCH 2/3] drm/i915: close PM interrupt masking races in the rps work func Daniel Vetter
2011-09-04 17:08 ` Ben Widawsky
2011-09-04 19:26 ` Daniel Vetter
2011-09-04 19:56 ` Ben Widawsky
2011-09-04 20:10 ` Daniel Vetter
2011-09-04 21:38 ` Ben Widawsky
2011-09-05 6:38 ` Daniel Vetter
2011-09-05 6:51 ` Ben Widawsky
2011-09-05 12:15 ` Chris Wilson
2011-09-04 15:35 ` [PATCH 3/3] drm/i915: close rps work vs. rps disable races Daniel Vetter
2011-09-04 17:23 ` Ben Widawsky
2011-09-04 19:17 ` Daniel Vetter
2011-09-04 19:50 ` Ben Widawsky
2011-09-04 19:57 ` Daniel Vetter [this message]
2011-09-05 8:15 ` [PATCH] drm/i915: properly cancel rps_work on module unload Daniel Vetter
2011-09-05 17:27 ` Ben Widawsky
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