linux-kernel - Re: [PATCH v2] PCI: kirin: Fix of_node

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Date:   Fri, 5 Nov 2021 13:59:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Wan Jiabing <wanjiabing@...o.com>
Cc:     Xiaowei Song <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, jiabing.wan@...com,
        mchehab+huawei@...nel.org
Subject: Re: [PATCH v2] PCI: kirin: Fix of_node_put() issue in pcie-kirin

On Thu, Nov 04, 2021 at 10:07:11PM -0400, Wan Jiabing wrote:
> Fix following coccicheck warning:
> ./drivers/pci/controller/dwc/pcie-kirin.c:414:2-34: WARNING: Function
> for_each_available_child_of_node should have of_node_put() before return.
> 
> Early exits from for_each_available_child_of_node should decrement the
> node reference counter. Replace return by goto here and add a missing
> of_node_put for parent.
> 
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>

I had already squashed this into:

  https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/commit/?id=b22dbbb24571

> ---
>  drivers/pci/controller/dwc/pcie-kirin.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index 06017e826832..b72a12bac49d 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -422,7 +422,8 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
>  			pcie->num_slots++;
>  			if (pcie->num_slots > MAX_PCI_SLOTS) {
>  				dev_err(dev, "Too many PCI slots!\n");
> -				return -EINVAL;
> +				ret = -EINVAL;
> +				goto put_node;
>  			}
>  
>  			ret = of_pci_get_devfn(child);
> @@ -446,6 +447,7 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
>  	return 0;
>  
>  put_node:
> +	of_node_put(parent);
>  	of_node_put(child);
>  	return ret;
>  }
> -- 
> 2.20.1
>