[PATCH] drm/amdgpu: check return status before using stable_pstate

[Alex Deucher]

Applied.  Thanks!

Alex

On Mon, Feb 14, 2022 at 1:22 PM <trix at redhat.com> wrote:
>
> From: Tom Rix <trix at redhat.com>
>
> Clang static analysis reports this problem
> amdgpu_ctx.c:616:26: warning: Assigned value is garbage
>   or undefined
>   args->out.pstate.flags = stable_pstate;
>                          ^ ~~~~~~~~~~~~~
> amdgpu_ctx_stable_pstate can fail without setting
> stable_pstate.  So check.
>
> Fixes: 8cda7a4f96e4 ("drm/amdgpu/UAPI: add new CTX OP to get/set stable pstates")
> Signed-off-by: Tom Rix <trix at redhat.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> index 1c72f6095f08..f522b52725e4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> @@ -613,7 +613,8 @@ int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
>                 if (args->in.flags)
>                         return -EINVAL;
>                 r = amdgpu_ctx_stable_pstate(adev, fpriv, id, false, &stable_pstate);
> -               args->out.pstate.flags = stable_pstate;
> +               if (!r)
> +                       args->out.pstate.flags = stable_pstate;
>                 break;
>         case AMDGPU_CTX_OP_SET_STABLE_PSTATE:
>                 if (args->in.flags & ~AMDGPU_CTX_STABLE_PSTATE_FLAGS_MASK)
> --
> 2.26.3
>