drm/i915: Add smp_rmb() to busy ioctl's RCU dance

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In the debate as to whether the second read of active->request is
ordered after the dependent reads of the first read of active->request,
just give in and throw a smp_rmb() in there so that ordering of loads is
assured.

v2: Explain the manual smp_rmb()

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1470731014-6894-1-git-send-email-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2016-08-09 09:23:33 +01:00

parent 87b723a16d

commit edf6b76f64

2 changed files with 34 additions and 5 deletions

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36

drivers/gpu/drm/i915/i915_gem.c

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3

drivers/gpu/drm/i915/i915_gem_request.h

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