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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Mon, 24 May 2021 14:12:06 -0400
Message-ID: <CADnq5_Os1fKouKSkfmmiWgjLxkX3FQ1Ny5Wcno7VQcheG4-26Q@mail.gmail.com>
Subject: Re: [PATCH -next] drm/amdgpu: fix error return code in amdgpu_acpi_init()
To:     Wei Yongjun <weiyongjun1@huawei.com>
Cc:     Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Prike Liang <Prike.Liang@amd.com>,
        Lijo Lazar <lijo.lazar@amd.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>,
        Ye Bin <yebin10@huawei.com>, Likun Gao <Likun.Gao@amd.com>,
        "Fabio M. De Francesco" <fmdefrancesco@gmail.com>,
        Hulk Robot <hulkci@huawei.com>,
        kernel-janitors@vger.kernel.org,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Mon, May 24, 2021 at 9:25 AM Wei Yongjun <weiyongjun1@huawei.com> wrote:
>
> Fix to return a negative error code from the error handling
> case instead of 0, as done elsewhere in this function.

I don't see any other cases in this function where we return an error.
It could arguably be made a void.  All of these APCI methods are
optional.

Alex

>
> Fixes: 77bf762f8b30 ("drm/amdgpu/acpi: unify ATCS handling (v3)")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> index 49563ff87f1a..9564690b21b4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> @@ -895,12 +895,15 @@ int amdgpu_acpi_init(struct amdgpu_device *adev)
>  atcs:
>         /* Probe for ATCS, and initialize it if found */
>         atcs_handle = amdgpu_atcs_probe_handle(handle);
> -       if (!atcs_handle)
> +       if (!atcs_handle) {
> +               ret = -ENODEV;
>                 goto out;
> +       }
>
>         atcs = kzalloc(sizeof(*atcs), GFP_KERNEL);
>         if (!atcs) {
>                 DRM_WARN("Not enough memory to initialize ATCS\n");
> +               ret = -ENOMEM;
>                 goto out;
>         }
>         atcs->handle = atcs_handle;
>