drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro

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With gcc-5 and CONFIG_UBSAN_SHIFT=y:

    drivers/gpu/drm/msm/msm_mdss.c: In function 'msm_mdss_enable':
    drivers/gpu/drm/msm/msm_mdss.c:296:2: error: case label does not reduce to an integer constant
      case DPU_HW_VER_800:
      ^
    drivers/gpu/drm/msm/msm_mdss.c:299:2: error: case label does not reduce to an integer constant
      case DPU_HW_VER_810:
      ^
    drivers/gpu/drm/msm/msm_mdss.c:300:2: error: case label does not reduce to an integer constant
      case DPU_HW_VER_900:
      ^

This happens because for major revisions 8 or greather, the non-sign bit
of the major revision number is shifted into bit 31 of a signed integer,
which is undefined behavior.

Fix this by casting the major revision number to unsigned int.

Fixes: efcd010772 ("drm/msm/dpu: add support for SM8550")
Fixes: 4a352c2fc1 ("drm/msm/dpu: Introduce SC8280XP")
Fixes: 100d7ef699 ("drm/msm/dpu: add support for SM8450")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/525152/
Link: https://lore.kernel.org/r/20230306090633.65918-1-geert+renesas@glider.be
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

...

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Geert Uytterhoeven 2023-03-06 10:06:33 +01:00 • committed by Dmitry Baryshkov

parent 27cfd5d734

commit 4760be481d

1 changed files with 3 additions and 2 deletions

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drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h

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