From: Imre Deak Date: Fri, 2 Nov 2012 11:30:50 +0000 (+0200) Subject: drm: hold event_lock while accessing vblank_event_list X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e7783ba3bf1c631278be6620875fbfa6b0eba905;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git drm: hold event_lock while accessing vblank_event_list Currently the only users of drm_vblank_off() are i915 and gma500, neither of which holds the event_lock when calling this function. Fix this by holding the event_lock while traversing the list. Signed-off-by: Imre Deak Signed-off-by: Inki Dae Signed-off-by: Kyungmin Park --- diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 2ba9d7fac345..19c01ca3cc76 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1021,6 +1021,8 @@ void drm_vblank_off(struct drm_device *dev, int crtc) /* Send any queued vblank events, lest the natives grow disquiet */ seq = drm_vblank_count_and_time(dev, crtc, &now); + + spin_lock(&dev->event_lock); list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { if (e->pipe != crtc) continue; @@ -1031,6 +1033,7 @@ void drm_vblank_off(struct drm_device *dev, int crtc) drm_vblank_put(dev, e->pipe); send_vblank_event(dev, e, seq, &now); } + spin_unlock(&dev->event_lock); spin_unlock_irqrestore(&dev->vbl_lock, irqflags); }