From: Wen Yang wen.yang99@zte.com.cn
commit 3842f5166bf1ef286fe7a39f262b5c9581308366 upstream.
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 Signed-off-by: Marek Behún kabel@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/host/pci-aardvark.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/pci/host/pci-aardvark.c +++ b/drivers/pci/host/pci-aardvark.c @@ -789,6 +789,7 @@ static int advk_pcie_init_irq_domain(str struct device_node *node = dev->of_node; struct device_node *pcie_intc_node; struct irq_chip *irq_chip; + int ret = 0;
raw_spin_lock_init(&pcie->irq_lock);
@@ -803,8 +804,8 @@ static int advk_pcie_init_irq_domain(str 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; @@ -816,11 +817,13 @@ static int advk_pcie_init_irq_domain(str &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)