drm: Delete the vblank timer synchronously at cleanup time
A race condition exists in drm_vblank_cleanup() if the vblank disable
timer callback runs after freeing the memory that its callback function
tries to access. Fix this by deleting the timer synchronously.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index c869436..acd2cb4 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -189,7 +189,7 @@
if (dev->num_crtcs == 0)
return;
- del_timer(&dev->vblank_disable_timer);
+ del_timer_sync(&dev->vblank_disable_timer);
vblank_disable_fn((unsigned long)dev);