linux-kernel - [PATCH -next] powerpc/iommu: Add missing of_node_put in iommu_init_early

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Message-ID: <20220425081245.21705-1-wupeng58@huawei.com>
Date:   Mon, 25 Apr 2022 08:12:45 +0000
From:   Peng Wu <wupeng58@...wei.com>
To:     <mpe@...erman.id.au>, <benh@...nel.crashing.org>,
        <nick.child@....com>
CC:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <liwei391@...wei.com>, <wangxiongfeng2@...wei.com>,
        Peng Wu <wupeng58@...wei.com>
Subject: [PATCH -next] powerpc/iommu: Add missing of_node_put in iommu_init_early_dart

The device_node pointer is returned by of_find_compatible_node
with refcount incremented. We should use of_node_put() to avoid
the refcount leak.

Signed-off-by: Peng Wu <wupeng58@...wei.com>
---
 arch/powerpc/sysdev/dart_iommu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index be6b99b1b352..9a02aed886a0 100644
--- a/arch/powerpc/sysdev/dart_iommu.c
+++ b/arch/powerpc/sysdev/dart_iommu.c
@@ -404,9 +404,10 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops)
 	}
 
 	/* Initialize the DART HW */
-	if (dart_init(dn) != 0)
+	if (dart_init(dn) != 0) {
+		of_node_put(dn);
 		return;
-
+	}
 	/*
 	 * U4 supports a DART bypass, we use it for 64-bit capable devices to
 	 * improve performance.  However, that only works for devices connected
@@ -419,6 +420,7 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops)
 
 	/* Setup pci_dma ops */
 	set_pci_dma_ops(&dma_iommu_ops);
+	of_node_put(dn);
 }
 
 #ifdef CONFIG_PM
-- 
2.17.1