[PATCH] amba: tegra-ahb: fix reference count leak in tegra_ahb_enable_smmu

[Miaoqian Lin <linmq006@gmail.com>]

The driver_find_device_by_of_node() function returns a device with its
reference count incremented. driver_find_device_by_of_node() is an inline
wrapper that calls driver_find_device(), which calls get_device(dev) and
returns the found device with an incremented reference count.

Fix this by adding the missing put_device() call after the device
operations are completed.

Found via static analysis.

Fixes: 89c788bab1f0 ("ARM: tegra: Add SMMU enabler in AHB")
Cc: stable@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/amba/tegra-ahb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
index c0e8b765522d..6c306d017b67 100644
--- a/drivers/amba/tegra-ahb.c
+++ b/drivers/amba/tegra-ahb.c
@@ -147,6 +147,7 @@ int tegra_ahb_enable_smmu(struct device_node *dn)
 	val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
 	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
 	gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
+	put_device(dev);
 	return 0;
 }
 EXPORT_SYMBOL(tegra_ahb_enable_smmu);
-- 
2.39.5 (Apple Git-154)