linux-kernel - [PATCH] drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path

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Message-ID: <20250904034447.665427-1-xiqi2@huawei.com>
Date: Thu, 4 Sep 2025 11:44:47 +0800
From: Qi Xi <xiqi2@...wei.com>
To: <bobo.shaobowang@...wei.com>, <xiqi2@...wei.com>,
	<andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
	<Laurent.pinchart@...asonboard.com>, <jonas@...boo.se>,
	<jernej.skrabec@...il.com>, <maarten.lankhorst@...ux.intel.com>,
	<mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
	<simona@...ll.ch>, <lumag@...nel.org>, <dianders@...omium.org>,
	<lyude@...hat.com>, <luca.ceresoli@...tlin.com>, <andy.yan@...k-chips.com>,
	<viro@...iv.linux.org.uk>, <mordan@...ras.ru>, <amishin@...rgos.ru>,
	<dri-devel@...ts.freedesktop.org>
CC: <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path

Add missing mutex unlock before returning from the error path in
cdns_mhdp_atomic_enable().

Fixes: 935a92a1c400 ("drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qi Xi <xiqi2@...wei.com>
---
 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index a614d1384f71..38726ae1bf15 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1984,8 +1984,10 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
 	mhdp_state = to_cdns_mhdp_bridge_state(new_state);
 
 	mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode);
-	if (!mhdp_state->current_mode)
-		return;
+	if (!mhdp_state->current_mode) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	drm_mode_set_name(mhdp_state->current_mode);
 
-- 
2.33.0