On Wed, Jun 22, 2016 at 08:46:12AM +0100, Chris Wilson wrote:
> 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@xxxxxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Julia Lawall <julia.lawall@xxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx>
Applied to drm-misc.
-Daniel
> ---
> drivers/gpu/drm/drm_fb_helper.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 0a06f9120b5a..ce54e985d91b 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -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
> * display if there's a master. */
> - if (READ_ONCE(dev->master))
> + if (lockless_dereference(dev->master))
> return false;
>
> drm_for_each_crtc(crtc, dev) {
> --
> 2.8.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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