drm: fix page_flip error handling

Free event and restore event_space only when page_flip->flags has
DRM_MODE_PAGE_FLIP_EVENT if page_flip() is failed.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d3aaeb6ae23..c79870a75c2 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3335,10 +3335,12 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 
         ret = crtc->funcs->page_flip(crtc, fb, e);
         if (ret) {
-                spin_lock_irqsave(&dev->event_lock, flags);
-                file_priv->event_space += sizeof e->event;
-                spin_unlock_irqrestore(&dev->event_lock, flags);
-                kfree(e);
+                if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
+                        spin_lock_irqsave(&dev->event_lock, flags);
+                        file_priv->event_space += sizeof e->event;
+                        spin_unlock_irqrestore(&dev->event_lock, flags);
+                        kfree(e);
+                }
         }
 
 out: