linux-kernel - Re: [PATCH v1] drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()

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Message-ID: <CADnq5_OujJOLukc74YQwwW4pdCA-M_4Gz_pZg8Je1ep3HZBBMw@mail.gmail.com>
Date:   Thu, 8 Apr 2021 16:17:36 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     wangyingjie55@....com
Cc:     "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Airlie <airlied@...hat.com>,
        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 v1] drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()

Applied.  Thanks!

Alex

On Wed, Apr 7, 2021 at 2:23 AM <wangyingjie55@....com> wrote:
>
> From: Yingjie Wang <wangyingjie55@....com>
>
> In radeon_dp_mst_detect(), We should check whether or not @connector
> has been unregistered from userspace. If the connector is unregistered,
> we should return disconnected status.
>
> Fixes: 9843ead08f18 ("drm/radeon: add DisplayPort MST support (v2)")
> Signed-off-by: Yingjie Wang <wangyingjie55@....com>
> ---
>  drivers/gpu/drm/radeon/radeon_dp_mst.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> index 2c32186c4acd..4e4c937c36c6 100644
> --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
> +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> @@ -242,6 +242,9 @@ radeon_dp_mst_detect(struct drm_connector *connector,
>                 to_radeon_connector(connector);
>         struct radeon_connector *master = radeon_connector->mst_port;
>
> +       if (drm_connector_is_unregistered(connector))
> +               return connector_status_disconnected;
> +
>         return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
>                                       radeon_connector->port);
>  }
> --
> 2.7.4
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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