[Intel-gfx] [PATCH 1/2] drm/i915: Fix locking in DRRS flush/invalidate hooks

[Jani Nikula]

On Thu, 09 Apr 2015, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> On Thu, Apr 09, 2015 at 04:44:15PM +0200, Daniel Vetter wrote:
>> We must acquire the mutex before we can check drrs.dp, otherwise
>> someone might sneak in with a modeset, clear the pointer after we've
>> checked it and then the code will Oops.
>> 
>> This issue has been introduced in
>> 
>> commit a93fad0f7fb8a3ff12e8814b630648f6d187954c
>> Author: Vandana Kannan <vandana.kannan at intel.com>
>> Date:   Sat Jan 10 02:25:59 2015 +0530
>> 
>>     drm/i915: DRRS calls based on frontbuffer
>> 
>> v2: Don't blow up on uninitialized mutex and work item by checking
>> whether DRRS is support or not first. Also unconditionally initialize
>> the mutex/work item to avoid future trouble.
>> 
>> Cc: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
>> Cc: Ramalingam C <ramalingam.c at intel.com>
>> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
>> Cc: Vandana Kannan <vandana.kannan at intel.com>
>> Cc: stable at vger.kernel.org (4.0+ only)
>> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
>
> Happier,
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> Tested-by: Chris Wilson <chris at chris-wilson.co.uk>

Both pushed to drm-intel-next-fixes, thanks for the patch and review.

BR,
Jani.

> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre
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-- 
Jani Nikula, Intel Open Source Technology Center