linux-kernel - Re: [PATCH] drm/amdgpu: Fix oops when pp_funcs is unset in ACPI event

Open Source and information security mailing list archives

Date:   Fri, 3 Apr 2020 16:36:52 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Aaron Ma <aaron.ma@...onical.com>
Cc:     "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        Chunming Zhou <David1.Zhou@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hawking Zhang <Hawking.Zhang@....com>,
        "Yuan, Xiaojie" <xiaojie.yuan@....com>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: Fix oops when pp_funcs is unset in ACPI event

On Fri, Apr 3, 2020 at 11:18 AM Aaron Ma <aaron.ma@...onical.com> wrote:
>
> On ARCTURUS and RENOIR, powerplay is not supported yet.
> When plug in or unplug power jack, ACPI event will issue.
> Then kernel NULL pointer BUG will be triggered.
> Check for NULL pointers before calling.
>
> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> index f197f1be0969..611de69f9d48 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> @@ -89,7 +89,8 @@ void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev)
>                         adev->pm.ac_power = true;
>                 else
>                         adev->pm.ac_power = false;
> -               if (adev->powerplay.pp_funcs->enable_bapm)
> +               if (adev->powerplay.pp_funcs &&
> +                               adev->powerplay.pp_funcs->enable_bapm)
>                         amdgpu_dpm_enable_bapm(adev, adev->pm.ac_power);
>                 mutex_unlock(&adev->pm.mutex);
>
> --
> 2.17.1
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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