1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index c1cbabcfb9d4..639821fb27b7 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -153,6 +153,8 @@ static void tilcdc_crtc_enable(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 
+        WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
         if (tilcdc_crtc->enabled)
                 return;
 
@@ -177,6 +179,8 @@ void tilcdc_crtc_disable(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct tilcdc_drm_private *priv = dev->dev_private;
 
+        WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
         if (!tilcdc_crtc->enabled)
                 return;
 
@@ -249,6 +253,8 @@ int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
         struct drm_device *dev = crtc->dev;
         unsigned long flags;
 
+        WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
         if (tilcdc_crtc->event) {
                 dev_err(dev->dev, "already pending page flip!\n");
                 return -EBUSY;
@@ -353,6 +359,8 @@ static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
         struct drm_framebuffer *fb = crtc->primary->state->fb;
 
+        WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
         if (WARN_ON(!info))
                 return;