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[v2,4/4] drm: hold event_lock while accessing vblank_event_list

Message ID 1351855850-6577-5-git-send-email-imre.deak@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Imre Deak Nov. 2, 2012, 11:30 a.m. UTC 
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 <imre.deak@intel.com>
---
 drivers/gpu/drm/drm_irq.c |    3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 3a3d0ce..c6cd558 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -949,6 +949,8 @@  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;
@@ -965,6 +967,7 @@  void drm_vblank_off(struct drm_device *dev, int crtc)
 		trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
 						 e->event.sequence);
 	}
+	spin_unlock(&dev->event_lock);
 
 	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 }