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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index fce245f64c4f..2efa4b031d73 100644
--- 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;
                 }