powerpc/iommu: Add missing of_node_put in iommu_init_early_dart

[ Upstream commit 57b742a5b8945118022973e6416b71351df512fb ]

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@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220425081245.21705-1-wupeng58@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index 1d33b7a..dc774b2 100644 (file)
--- 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