linux-kernel - [PATCH 5.4 190/475] drm/tegra: Fix reference leak in tegra_dsi_ganged

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Message-Id: <20220414110900.447499475@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:09:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 190/475] drm/tegra: Fix reference leak in tegra_dsi_ganged_probe

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit 221e3638feb8bc42143833c9a704fa89b6c366bb ]

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore. Add put_device() call to fix this.

Fixes: e94236cde4d5 ("drm/tegra: dsi: Add ganged mode support")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/tegra/dsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index a5d47e301c5f..13413d2b2602 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1455,8 +1455,10 @@ static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
 		dsi->slave = platform_get_drvdata(gangster);
 		of_node_put(np);
 
-		if (!dsi->slave)
+		if (!dsi->slave) {
+			put_device(&gangster->dev);
 			return -EPROBE_DEFER;
+		}
 
 		dsi->slave->master = dsi;
 	}
-- 
2.34.1