PCI: aardvark: Fix a leaked reference by adding missing of_node_put()

The call to of_get_next_child() returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

irq_domain_add_linear() also calls of_node_get() to increase refcount,
so irq_domain will not be affected when it is released.

Detected by coccinelle with the following warnings:
  ./drivers/pci/controller/pci-aardvark.c:826:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 798, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index eb58dfdaba1b..134e0306ff00 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -794,6 +794,7 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
         struct device_node *node = dev->of_node;
         struct device_node *pcie_intc_node;
         struct irq_chip *irq_chip;
+        int ret = 0;
 
         pcie_intc_node =  of_get_next_child(node, NULL);
         if (!pcie_intc_node) {
@@ -806,8 +807,8 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
         irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq",
                                         dev_name(dev));
         if (!irq_chip->name) {
-                of_node_put(pcie_intc_node);
-                return -ENOMEM;
+                ret = -ENOMEM;
+                goto out_put_node;
         }
 
         irq_chip->irq_mask = advk_pcie_irq_mask;
@@ -819,11 +820,13 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
                                       &advk_pcie_irq_domain_ops, pcie);
         if (!pcie->irq_domain) {
                 dev_err(dev, "Failed to get a INTx IRQ domain\n");
-                of_node_put(pcie_intc_node);
-                return -ENOMEM;
+                ret = -ENOMEM;
+                goto out_put_node;
         }
 
-        return 0;
+out_put_node:
+        of_node_put(pcie_intc_node);
+        return ret;
 }
 
 static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)