linux-kernel - [PATCH] PCI: xilinx-nwl: add missing of_node

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Date:   Thu, 14 Jun 2018 11:04:34 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] PCI: xilinx-nwl: add missing of_node_put()

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

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Fixes: commit ab597d35ef11 ("PCI: xilinx-nwl: Add support for Xilinx NWL PCIe Host Controller")
---

Problem found by an experimental cocinelle script

Patch was compile tested with: multi_v7_defconfig + ARCH_ZYNQ=y,
COMPILE_TEST=y, PCIE_XILINX_NWL=y
(one sparse warning though not related to the change proposed though)

Patch is against 4.17.0 (localversion-next is next-20180613)

 drivers/pci/controller/pcie-xilinx-nwl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
index 6a4bbb5..fb32840 100644
--- a/drivers/pci/controller/pcie-xilinx-nwl.c
+++ b/drivers/pci/controller/pcie-xilinx-nwl.c
@@ -559,7 +559,7 @@ static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
 							PCI_NUM_INTX,
 							&legacy_domain_ops,
 							pcie);
-
+	of_node_put(legacy_intc_node);
 	if (!pcie->legacy_irq_domain) {
 		dev_err(dev, "failed to create IRQ domain\n");
 		return -ENOMEM;
-- 
2.1.4