[PATCH] drm/amd: fix some dead code in `gfx_v9_0_init_cp_compute_microcode`

[Alex Deucher]

On Thu, Jan 12, 2023 at 5:37 PM Mario Limonciello
<mario.limonciello at amd.com> wrote:
>
> Some dead code was introdcued as part of utilizing the `amdgpu_ucode_*`
> helpers. Adjust the control flow to make sure that firmware is released
> in the appropriate error flows.
>
> Reported-by: coverity-bot <keescook+coverity-bot at chromium.org>
> Addresses-Coverity-ID: 1530548 ("Control flow issues")
> Fixes: ec787deb2ddf ("drm/amd: Use `amdgpu_ucode_*` helpers for GFX9")
> Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index e80685d1e6c6c..d4b0fa4b62a44 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -1345,7 +1345,7 @@ static int gfx_v9_0_init_cp_compute_microcode(struct amdgpu_device *adev,
>
>         err = amdgpu_ucode_request(adev, &adev->gfx.mec_fw, fw_name);
>         if (err)
> -               return err;
> +               goto out;
>         amdgpu_gfx_cp_init_microcode(adev, AMDGPU_UCODE_ID_CP_MEC1);
>         amdgpu_gfx_cp_init_microcode(adev, AMDGPU_UCODE_ID_CP_MEC1_JT);
>
> @@ -1355,13 +1355,14 @@ static int gfx_v9_0_init_cp_compute_microcode(struct amdgpu_device *adev,
>                 else
>                         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mec2.bin", chip_name);
>
> +               /* ignore failures to load */
>                 err = amdgpu_ucode_request(adev, &adev->gfx.mec2_fw, fw_name);
>                 if (!err) {
>                         amdgpu_gfx_cp_init_microcode(adev, AMDGPU_UCODE_ID_CP_MEC2);
>                         amdgpu_gfx_cp_init_microcode(adev, AMDGPU_UCODE_ID_CP_MEC2_JT);
>                 } else {
>                         err = 0;
> -                       adev->gfx.mec2_fw = NULL;
> +                       amdgpu_ucode_release(&adev->gfx.mec2_fw);
>                 }
>         } else {
>                 adev->gfx.mec2_fw_version = adev->gfx.mec_fw_version;
> @@ -1370,10 +1371,10 @@ static int gfx_v9_0_init_cp_compute_microcode(struct amdgpu_device *adev,
>
>         gfx_v9_0_check_if_need_gfxoff(adev);
>         gfx_v9_0_check_fw_write_wait(adev);
> -       if (err) {
> +
> +out:
> +       if (err)
>                 amdgpu_ucode_release(&adev->gfx.mec_fw);
> -               amdgpu_ucode_release(&adev->gfx.mec2_fw);
> -       }
>         return err;
>  }
>
> --
> 2.34.1
>