Patch "drm/tegra: Fix reference leak in tegra_dsi_ganged_probe" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/tegra: Fix reference leak in tegra_dsi_ganged_probe

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-tegra-fix-reference-leak-in-tegra_dsi_ganged_pro.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0d5fbe06a308deaa8a0e601085ef306c4e36fbc4
Author: Miaoqian Lin <linmq006@xxxxxxxxx>
Date:   Mon Jan 10 06:53:16 2022 +0000

    drm/tegra: Fix reference leak in tegra_dsi_ganged_probe
    
    [ 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@xxxxxxxxx>
    Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index f46d377f0c30..de1333dc0d86 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1538,8 +1538,10 @@ 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;
 	}