From: Krzysztof Wilczyński kw@linux.com
[ Upstream commit 42814c438aac79746d310f413a27d5b0b959c5de ]
The for_each_available_child_of_node helper internally makes use of the of_get_next_available_child() which performs an of_node_get() on each iteration when searching for next available child node.
Should an available child node be found, then it would return a device node pointer with reference count incremented, thus early return from the middle of the loop requires an explicit of_node_put() to prevent reference count leak.
To stop the reference leak, explicitly call of_node_put() before returning after an error occurred.
Link: https://lore.kernel.org/r/20210120184810.3068794-1-kw@linux.com Signed-off-by: Krzysztof Wilczyński kw@linux.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/pcie-mediatek.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index 626a7c352dfd..728a59655825 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -1063,14 +1063,14 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) err = of_pci_get_devfn(child); if (err < 0) { dev_err(dev, "failed to parse devfn: %d\n", err); - return err; + goto error_put_node; }
slot = PCI_SLOT(err);
err = mtk_pcie_parse_port(pcie, child, slot); if (err) - return err; + goto error_put_node; }
err = mtk_pcie_subsys_powerup(pcie); @@ -1086,6 +1086,9 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) mtk_pcie_subsys_powerdown(pcie);
return 0; +error_put_node: + of_node_put(child); + return err; }
static int mtk_pcie_probe(struct platform_device *pdev)