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Message-Id: <1617765004-5308-1-git-send-email-wangyingjie55@126.com>
Date: Tue, 6 Apr 2021 20:10:04 -0700
From: wangyingjie55@....com
To: alexander.deucher@....com, christian.koenig@....com,
airlied@...ux.ie, daniel@...ll.ch, airlied@...hat.com
Cc: wangyingjie55@....com, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()
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
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