Re: [PATCH] drm/i915: Suppress hotplug work during PM suspend/resume

[Takashi Iwai <tiwai@suse.de>]

At Thu, 10 May 2012 10:25:44 +0100,
Chris Wilson wrote:
> 
> On Thu, 10 May 2012 11:19:11 +0200, Takashi Iwai <tiwai@suse.de> wrote:
> > At Thu, 10 May 2012 11:06:46 +0200,
> > Daniel Vetter wrote:
> > > This patch is not just for hotplug, but for all the delayed work and timer
> > > stuff the driver does. And we _do_ have a bug report that leaking the rps
> > > work (for snb+ turbo mode) across either a s/r cycle or a gpu reset kills
> > > the driver.
> > 
> > Yes, but my point is that Chris's patch (at least the commit above
> > alone) won't fix the problem we faced.
> 
> The patch I thought you two were talking about was:
> http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=fastboot&id=a5f91dcc3cb7a9dc1214d5014ea6f0338824ad8e
> which is what I thought we had planned to fix the residual issue.

Thanks, this explains better :)

But, as far as I checked, the hotplug event wasn't a leftover but
newly triggered during the resume procedure.  Thus there is still a
race even with the patch [drm/i915: Cancel outstanding modeset workers
before suspend].


Takashi