On Sun, Mar 02, 2025 at 09:56:00PM +0100, Markus Elfring wrote:
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Tue, 11 Apr 2023 18:24:24 +0200
>
> The address of a data structure member was determined before
> a corresponding null pointer check in the implementation of
> the functions “dpu_hw_pp_enable_te” and “dpu_hw_pp_get_vsync_info”.
>
> Thus avoid the risk for undefined behaviour by removing extra
> initialisations for the variable “c” (also because it was already
> reassigned with the same value behind this pointer check).
>
> This issue was detected by using the Coccinelle software.
Please don't send resends and/or new iterations in response to your
previous patchsets. Otherwise they have a pretty high chance to be
ignored by the maintainers. Use a fresh git-send-email command to send
new patchset.
>
> Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> index 0fcad9760b6f..870ab3ebbc94 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> @@ -176,7 +176,7 @@ static int dpu_hw_pp_enable_te(struct dpu_hw_pingpong *pp, bool enable)
> static int dpu_hw_pp_connect_external_te(struct dpu_hw_pingpong *pp,
> bool enable_external_te)
> {
> - struct dpu_hw_blk_reg_map *c = &pp->hw;
> + struct dpu_hw_blk_reg_map *c;
> u32 cfg;
> int orig;
>
> @@ -221,7 +221,7 @@ static int dpu_hw_pp_get_vsync_info(struct dpu_hw_pingpong *pp,
>
> static u32 dpu_hw_pp_get_line_count(struct dpu_hw_pingpong *pp)
> {
> - struct dpu_hw_blk_reg_map *c = &pp->hw;
> + struct dpu_hw_blk_reg_map *c;
> u32 height, init;
> u32 line = 0xFFFF;
>
> --
> 2.40.0
>
--
With best wishes
Dmitry
