linux-kernel - Re: [PATCH] drm/amdgpu: check return status before using stable

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Date:   Mon, 14 Feb 2022 13:25:55 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Tom Rix <trix@...hat.com>
Cc:     "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Tuikov, Luben" <luben.tuikov@....com>,
        "Nieto, David M" <david.nieto@....com>,
        Nirmoy Das <nirmoy.das@....com>, "Xue, Ken" <Ken.Xue@....com>,
        Roy Sun <Roy.Sun@....com>, "Quan, Evan" <evan.quan@....com>,
        llvm@...ts.linux.dev,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: check return status before using stable_pstate

Applied.  Thanks!

Alex

On Mon, Feb 14, 2022 at 1:22 PM <trix@...hat.com> wrote:
>
> From: Tom Rix <trix@...hat.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@...hat.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
>