drm/tegra: Make CRTC upcasting safer



When upcasting a NULL CRTC object, propagate the NULL pointer instead of
some invalid pointer. This allows subsequent code to check that the cast
object is valid.

Signed-off-by: Thierry Reding <treding@nvidia.com>

parent 43dd5554

drivers/gpu/drm/tegra/drm.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -116,7 +116,7 @@ host1x_client_to_dc(struct host1x_client *client)

		static inline struct tegra_dc to_tegra_dc(struct drm_crtc crtc)
		{
		return container_of(crtc, struct tegra_dc, base);
		return crtc ? container_of(crtc, struct tegra_dc, base) : NULL;
		}

		static inline void tegra_dc_writel(struct tegra_dc *dc, unsigned long value,