Hi,
This avoids a NULL pointer dereference when no crtc is available (e.g.
the fsl,panel not assigned).
Any chance to get this into 4.4?
Tested-by: Stefan Agner <stefan@xxxxxxxx>
--
Stefan
On 2015-08-30 20:39, Jianwei Wang wrote:
> For state->fb may be NULL in fsl_dcu_drm_plane_atomic_check function,
> if so, return -EINVAL. No need check in fsl_dcu_drm_plane_atomic_update
> anymore.
>
> Signed-off-by: Jianwei Wang <jianwei.wang.chn@xxxxxxxxx>
> ---
> drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> index 82be6b8..8787920 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> @@ -41,6 +41,9 @@ static int fsl_dcu_drm_plane_atomic_check(struct
> drm_plane *plane,
> {
> struct drm_framebuffer *fb = state->fb;
>
> + if (!fb)
> + return -EINVAL;
> +
> switch (fb->pixel_format) {
> case DRM_FORMAT_RGB565:
> case DRM_FORMAT_RGB888:
> @@ -84,9 +87,6 @@ static void fsl_dcu_drm_plane_atomic_update(struct
> drm_plane *plane,
> unsigned int alpha, bpp;
> int index, ret;
>
> - if (!fb)
> - return;
> -
> index = fsl_dcu_drm_plane_index(plane);
> if (index < 0)
> return;
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