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drm/tegra: Make CRTC upcasting safer

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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>
This commit is contained in:
Thierry Reding 2013-11-08 12:30:37 +01:00
parent 43dd5554fc
commit 37826519c4
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/tegra/drm.h
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@ -116,7 +116,7 @@ host1x_client_to_dc(struct host1x_client *client)
static inline struct tegra_dc *to_tegra_dc(struct drm_crtc *crtc) 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, static inline void tegra_dc_writel(struct tegra_dc *dc, unsigned long value,