[PATCH 6.19 603/844] drm/tegra: dsi: fix device leak on probe

[Sasha Levin]

From: Johan Hovold <johan@xxxxxxxxxx>

[ Upstream commit bfef062695570842cf96358f2f46f4c6642c6689 ]

Make sure to drop the reference taken when looking up the companion
(ganged) device and its driver data during probe().

Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.

Fixes: e94236cde4d5 ("drm/tegra: dsi: Add ganged mode support")
Fixes: 221e3638feb8 ("drm/tegra: Fix reference leak in tegra_dsi_ganged_probe")
Cc: stable@xxxxxxxxxxxxxxx	# 3.19: 221e3638feb8
Cc: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Link: https://patch.msgid.link/20251121164201.13188-1-johan@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/tegra/dsi.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 175f5f9937b01..8ee96b59fdbc8 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1542,11 +1542,9 @@ static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
 			return -EPROBE_DEFER;
 
 		dsi->slave = platform_get_drvdata(gangster);
-
-		if (!dsi->slave) {
-			put_device(&gangster->dev);
+		put_device(&gangster->dev);
+		if (!dsi->slave)
 			return -EPROBE_DEFER;
-		}
 
 		dsi->slave->master = dsi;
 	}
-- 
2.51.0