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drm/tegra: hub: Fix dereference before check

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Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-02-11 11:51:20 +01:00
parent 9e98c678c2
commit 7cf77b273a
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/tegra/hub.c
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@ -378,14 +378,16 @@ static int tegra_shared_plane_atomic_check(struct drm_plane *plane,
static void tegra_shared_plane_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct tegra_dc *dc = to_tegra_dc(old_state->crtc);
struct tegra_plane *p = to_tegra_plane(plane);
struct tegra_dc *dc;
u32 value;
/* rien ne va plus */
if (!old_state || !old_state->crtc)
return;
dc = to_tegra_dc(old_state->crtc);
/*
* XXX Legacy helpers seem to sometimes call ->atomic_disable() even
* on planes that are already disabled. Make sure we fallback to the