[PATCH 11/22] drm/msm: Use drm_mode_init() for on-stack modes

[Abhinav Kumar]

On 2/18/2022 2:03 AM, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Initialize on-stack modes with drm_mode_init() to guarantee
> no stack garbage in the list head, or that we aren't copying
> over another mode's list head.
> 
> Based on the following cocci script, with manual fixups:
> @decl@
> identifier M;
> expression E;
> @@
> - struct drm_display_mode M = E;
> + struct drm_display_mode M;
> 
> @@
> identifier decl.M;
> expression decl.E;
> statement S, S1;
> @@
> struct drm_display_mode M;
> ... when != S
> + drm_mode_init(&M, &E);
> +
> S1
> 
> @@
> expression decl.E;
> @@
> - &*E
> + E
> 
> Cc: Rob Clark <robdclark at gmail.com>
> Cc: Sean Paul <sean at poorly.run>
> Cc: Abhinav Kumar <quic_abhinavk at quicinc.com>
> Cc: linux-arm-msm at vger.kernel.org
> Cc: freedreno at lists.freedesktop.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index ddd9d89cd456..e7813c6f7bd9 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -248,12 +248,13 @@ static void dpu_encoder_phys_vid_setup_timing_engine(
>   	unsigned long lock_flags;
>   	struct dpu_hw_intf_cfg intf_cfg = { 0 };
>   
> +	drm_mode_init(&mode, &phys_enc->cached_mode);
> +
>   	if (!phys_enc->hw_ctl->ops.setup_intf_cfg) {
>   		DPU_ERROR("invalid encoder %d\n", phys_enc != NULL);
>   		return;
>   	}
>   
> -	mode = phys_enc->cached_mode;
>   	if (!phys_enc->hw_intf->ops.setup_timing_gen) {
>   		DPU_ERROR("timing engine setup is not supported\n");
>   		return;
> @@ -652,7 +653,9 @@ static int dpu_encoder_phys_vid_get_frame_count(
>   {
>   	struct intf_status s = {0};
>   	u32 fetch_start = 0;
> -	struct drm_display_mode mode = phys_enc->cached_mode;
> +	struct drm_display_mode mode;
> +
> +	drm_mode_init(&mode, &phys_enc->cached_mode);
>   
>   	if (!dpu_encoder_phys_vid_is_master(phys_enc))
>   		return -EINVAL;