mutex_lock(&imxdrm->mutex);
+ /*
+ * The vblank arrays are dimensioned by MAX_CRTC - we can't
+ * pass IDs greater than this to those functions.
+ */
+ if (imxdrm->pipes >= MAX_CRTC) {
+ ret = -EINVAL;
+ goto err_busy;
+ }
+
if (imxdrm->drm->open_count) {
ret = -EBUSY;
goto err_busy;