linux-kernel - Re: [PATCH] PCI: imx: fix device node reference leak in imx_pcie

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Message-ID: <aLiJgMXB0wIjadrd@lizhi-Precision-Tower-5810>
Date: Wed, 3 Sep 2025 14:31:28 -0400
From: Frank Li <Frank.li@....com>
To: Miaoqian Lin <linmq006@...il.com>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Trent Piepho <tpiepho@...inj.com>, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] PCI: imx: fix device node reference leak in
 imx_pcie_probe

On Wed, Sep 03, 2025 at 09:51:50PM +0800, Miaoqian Lin wrote:

Subject: PCI: imx: Add missing of_node_put() to fix device node reference leak

> As the doc of of_parse_phandle() states:
> "The device_node pointer with refcount incremented.  Use
>  * of_node_put() on it when done."

Needn't this paragaph

Frank
> Add missing of_node_put() after of_parse_phandle() call to properly
> release the device node reference.
>
> Found via static analysis.
>
> Fixes: 1df82ec46600 ("PCI: imx: Add workaround for e10728, IMX7d PCIe PLL failure")
> Cc: stable@...r.kernel.org
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 80e48746bbaf..618bc4b08a8b 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1636,6 +1636,7 @@ static int imx_pcie_probe(struct platform_device *pdev)
>  		struct resource res;
>
>  		ret = of_address_to_resource(np, 0, &res);
> +		of_node_put(np);
>  		if (ret) {
>  			dev_err(dev, "Unable to map PCIe PHY\n");
>  			return ret;
> --
> 2.35.1
>