linux-kernel - Re: [PATCH] PCI: imx6: Add missing of_node_put() in imx6_pcie

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Date:   Thu, 10 Mar 2022 13:06:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        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>,
        NXP Linux Team <linux-imx@....com>,
        Trent Piepho <tpiepho@...inj.com>,
        PCI <linux-pci@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: imx6: Add missing of_node_put() in imx6_pcie_probe

On Mon, Mar 7, 2022 at 8:29 PM Miaoqian Lin <linmq006@...il.com> wrote:
>
> The device_node pointer is returned by of_parse_phandle()  with refcount
> incremented. We should use of_node_put() on it when done.
>
> Fixes: 1df82ec46600 ("PCI: imx: Add workaround for e10728, IMX7d PCIe PLL failure")
> 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 6974bd5aa116..bcc338ab6c11 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1050,6 +1050,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>                 struct resource res;
>
>                 ret = of_address_to_resource(np, 0, &res);
> +               of_node_put(np);

So now you are using the phy within the driver, but not holding a
reference to its node? That is wrong. Though if a struct device was
created for the phy's node, it would hold a reference. There are a
bunch of error paths where the reference should be dropped. But
really, this driver is a big mess with the phy binding and framework
not used and your nodes probably aren't going to be disappearing on
you anyways.

Rob