drm/exynos: hold event_lock while accessing pageflip_event_list

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index fce245f..2efa4b0 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -236,16 +236,21 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
                        goto out;
                }
 
+               spin_lock_irq(&dev->event_lock);
                list_add_tail(&event->base.link,
                                &dev_priv->pageflip_event_list);
+               spin_unlock_irq(&dev->event_lock);
 
                crtc->fb = fb;
                ret = exynos_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y,
                                                    NULL);
                if (ret) {
                        crtc->fb = old_fb;
+
+                       spin_lock_irq(&dev->event_lock);
                        drm_vblank_put(dev, exynos_crtc->pipe);
                        list_del(&event->base.link);
+                       spin_unlock_irq(&dev->event_lock);
 
                        goto out;
                }