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drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference

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We are only documenting that the read is outside of the lock, and do not
require strict ordering on the operation. In this case the more relaxed
lockless_dereference() will suffice.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466581572-16608-1-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-06-22 08:46:12 +01:00 committed by Daniel Vetter
parent 366e292df6
commit fa7d81bb3c
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_fb_helper.c
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@ -464,7 +464,7 @@ static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
/* Sometimes user space wants everything disabled, so don't steal the /* Sometimes user space wants everything disabled, so don't steal the
* display if there's a master. */ * display if there's a master. */
if (READ_ONCE(dev->master)) if (lockless_dereference(dev->master))
return false; return false;
drm_for_each_crtc(crtc, dev) { drm_for_each_crtc(crtc, dev) {