drm/i915: Error checks in gen6_set_rps

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With the new "standardized" sysfs interfaces we need to be a bit more
careful about setting the RPS values.

Because the sysfs code and the rps workqueue can run at the same time,
if the sysfs setter wins the race to the mutex, the workqueue can come
in and set a value which is out of range (ie. we're no longer protecting
by RPINTLIM).

I was not able to actually make this error occur in testing.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Ben Widawsky 2012-09-07 19:43:42 -07:00 • committed by Daniel Vetter

parent d5570a7243

commit 792496368b

2 changed files with 9 additions and 1 deletions

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8

drivers/gpu/drm/i915/i915_irq.c

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2

drivers/gpu/drm/i915/intel_pm.c

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