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drm/layerscape: fix handling fsl_dcu_drm_plane_index result 

The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Andrzej Hajda 2015-09-21 15:33:47 +02:00 committed by Dave Airlie
parent 728f86607d
commit 14d11b8dca
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
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@ -58,7 +58,8 @@ static void fsl_dcu_drm_plane_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state) struct drm_plane_state *old_state)
{ {
struct fsl_dcu_drm_device *fsl_dev = plane->dev->dev_private; struct fsl_dcu_drm_device *fsl_dev = plane->dev->dev_private;
unsigned int index, value, ret; unsigned int value;
int index, ret;
index = fsl_dcu_drm_plane_index(plane); index = fsl_dcu_drm_plane_index(plane);
if (index < 0) if (index < 0)