[Intel-gfx] [PATCH] drm/i915: Check idle to active before processing CSQ

[Daniel Vetter]

On Fri, Aug 07, 2015 at 11:15:56AM +0300, Mika Kuoppala wrote:
> Daniel Vetter <daniel at ffwll.ch> writes:
> 
> > On Thu, Aug 06, 2015 at 05:09:17PM +0300, Mika Kuoppala wrote:
> >> If idle to active bit is set, the rest of the fields
> >> in CSQ are not valid.
> >> 
> >> Bail out early if this is the case in order to prevent
> >> rest of the loop inspecting stale values.
> >> 
> >> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
> >
> > Same questions here too, what's the impact. E.g. if you only found this by
> > bspec/code inspection then it's for -next, but if it's to fix some known
> > breakage then it's for -fixes + cc: stable.
> >
> 
> To this and the masked write one: Both of these were found
> when I was trying to find out root cause for skl hangs.
> 
> They are both for -next. Both are in the correctness
> department vrt bspec and I haven't observed any other
> impact.
> 
> Point taken on being more verbose.

Thanks I added a note about this to the first patch and merged it. This
one here still seems to miss an r-b.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch