drm/exynos: fix kernel panic issue at drm releasing

This patch fixes a kernel panic issue which happened
when drm driver is closed while modetest.

This issue could be reproduced easily by launching modetest
with page flip repeatedly.

The reason is that invalid drm_file object could be accessed by
send_vblank_event function when finishing page flip if the drm_file
object was removed by drm_release and there was a pended page
flip event which was already committed to hardware.

So this patch makes the pended page flip event to be cancelled by
preclose callback which is called at front of drm_release function.

Changelog v2:
- free vblank event objects belonging to the request process,
  increment event space and decrease pending_update when cancelling
  the event

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index cd9498164dc1..e36579c1c025 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -226,3 +226,29 @@ void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
 	if (exynos_crtc->ops->te_handler)
 		exynos_crtc->ops->te_handler(exynos_crtc);
 }
+
+void exynos_drm_crtc_cancel_page_flip(struct drm_crtc *crtc,
+					struct drm_file *file)
+{
+	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+	struct drm_pending_vblank_event *e;
+	unsigned long flags;
+
+	spin_lock_irqsave(&crtc->dev->event_lock, flags);
+	e = exynos_crtc->event;
+	if (e && e->base.file_priv == file) {
+		exynos_crtc->event = NULL;
+		/*
+		 * event will be destroyed by core part
+		 * so below line should be removed later with core changes
+		 */
+		e->base.destroy(&e->base);
+		/*
+		 * event_space will be increased by core part
+		 * so below line should be removed later with core changes.
+		 */
+		file->event_space += sizeof(e->event);
+		atomic_dec(&exynos_crtc->pending_update);
+	}
+	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+}