From fa7d81bb3c269a2ee38b6e4d569d9eb8be1a78ad Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 22 Jun 2016 08:46:12 +0100 Subject: [PATCH] drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference 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 Cc: Daniel Vetter Cc: Julia Lawall Cc: Chris Wilson Cc: Emil Velikov Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1466581572-16608-1-git-send-email-chris@chris-wilson.co.uk --- 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) { -- 2.30.2