drm/i915: Replace manual barrier() with READ_ONCE() in HWS accessor

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When reading from the HWS page, we use barrier() to prevent the compiler
optimising away the read from the volatile (may be updated by the GPU)
memory address. This is more suited to READ_ONCE(); make it so.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460195877-20520-5-git-send-email-chris@chris-wilson.co.uk

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Chris Wilson 2016-04-09 10:57:57 +01:00

parent 0d317ce99e

commit 5dd8e50c27

1 changed files with 2 additions and 4 deletions

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drivers/gpu/drm/i915/intel_ringbuffer.h

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