diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e7e95c3cf6adf178febdb0619608ef3070efd81c..8635bb7878feccccf984411954e95c4c74545a4c 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1760,6 +1760,9 @@ static void intel_prepare_shared_dpll(struct intel_crtc *crtc) struct drm_i915_private *dev_priv = dev->dev_private; struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc); + if (WARN_ON(pll == NULL)) + return; + WARN_ON(!pll->refcount); if (pll->active == 0) { DRM_DEBUG_DRIVER("setting up %s\n", pll->name);