drm/i915: Check for a NULL shared dpll before dereferencing

This doesn't look possible but a little extra defense against the
improbable is worth it - an oops here could lockup the machine.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e7e95c3..8635bb7 100644 (file)
--- 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);