[PATCH] drm/amdgpu: don't ignore the return from thermal_init

[Alex Deucher]

On Mon, Jul 13, 2020 at 9:48 AM Shashank Sharma <shashank.sharma at amd.com> wrote:
>
> The current hw_init code for si_dpm ignores the return value of the
> function attempting to initialize the thermal controller, which in
> turn sets the dpm_enabled status wrongly to true in hw_init, which
> should be actually false.
>
> This patch:
> - Adds the return value check for thermal controller initialization,
>   and passes the return value to dpm_enable().
> - Adds a DRM_ERROR to indicate this failure.
>
> Cc: Alex Deucher <Alexander.Deucher at amd.com>
> Cc: Maruthi Bayyavarapu <maruthi.bayyavarapu at amd.com>
> Cc: Sonny Jing <Sonny.Jiang at amd.com>
>
> PS: This issue was observed on OLAND while running the reboot
> stress test.
>
> Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>

I have vague memories of this not being a fatal issue so it didn't
need to be checked, but it was so long ago I can't remember, and the
relevant history is not coming to me.
Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/si_dpm.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.c b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> index c00ba4b23c9a..923a1da554b3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> @@ -6868,7 +6868,11 @@ static int si_dpm_enable(struct amdgpu_device *adev)
>         si_start_dpm(adev);
>
>         si_enable_auto_throttle_source(adev, AMDGPU_DPM_AUTO_THROTTLE_SRC_THERMAL, true);
> -       si_thermal_start_thermal_controller(adev);
> +       ret = si_thermal_start_thermal_controller(adev);
> +       if (ret) {
> +               DRM_ERROR("si_thermal_start_thermal_controller failed\n");
> +               return ret;
> +       }
>
>         return 0;
>  }
> --
> 2.25.1
>
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