linux-kernel - [PATCH] drm/msm/dp: populate connector of struct dp

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Date:   Tue, 28 Dec 2021 09:51:48 -0800
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <robdclark@...il.com>, <sean@...rly.run>, <swboyd@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...ux.ie>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <bjorn.andersson@...aro.org>
CC:     <quic_abhinavk@...cinc.com>, <aravindh@...eaurora.org>,
        <quic_khsieh@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/msm/dp: populate connector of struct  dp_panel

There is kernel crashed happen due to unable to handle kernel NULL
pointer dereference  of dp_panel->connector while running DP link
layer compliance test case 4.2.2.6 (EDIDCorruption Detection).
This patch will fixed the problem by populating connector of dp_panel.

Fixes: 7948fe12d47 ("drm/msm/dp: return correct edid checksum after corrupted edid checksum read")
Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_panel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 71db10c..6a938a2 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -197,6 +197,8 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 	kfree(dp_panel->edid);
 	dp_panel->edid = NULL;
 
+	dp_panel->connector = connector;
+
 	dp_panel->edid = drm_get_edid(connector,
 					      &panel->aux->ddc);
 	if (!dp_panel->edid) {
-- 
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