linux-kernel - Re: [PATCH v2] PCI: brcmstb: Fix for missing of_node

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Message-ID: <20250131115217.qu4ue4cfmdt7gudf@thinkpad>
Date: Fri, 31 Jan 2025 17:22:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Stanimir Varbanov <svarbanov@...e.de>
Cc: linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Jim Quinlan <jim2101024@...il.com>,
	Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>, kw@...ux.com,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] PCI: brcmstb: Fix for missing of_node_put

On Thu, Jan 23, 2025 at 12:29:55AM +0200, Stanimir Varbanov wrote:
> A call to of_parse_phandle() is incrementing the refcount, of_node_put
> must be called when done the work on it. Add missing of_node_put() after
> the check for msi_np == np and MSI initialization.
> 
> Cc: stable@...r.kernel.org # v5.10+
> Fixes: 40ca1bf580ef ("PCI: brcmstb: Add MSI support")
> Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
> v1 -> v2:
>  - Use of_node_put instead of cleanups (Florian).
>  - Sent the patch separately from PCIe 2712 series (Florian).
> 
>  drivers/pci/controller/pcie-brcmstb.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 744fe1a4cf9c..d171ee61eab3 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -1844,7 +1844,7 @@ static struct pci_ops brcm7425_pcie_ops = {
>  
>  static int brcm_pcie_probe(struct platform_device *pdev)
>  {
> -	struct device_node *np = pdev->dev.of_node, *msi_np;
> +	struct device_node *np = pdev->dev.of_node;
>  	struct pci_host_bridge *bridge;
>  	const struct pcie_cfg_data *data;
>  	struct brcm_pcie *pcie;
> @@ -1944,9 +1944,14 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>  		goto fail;
>  	}
>  
> -	msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
> -	if (pci_msi_enabled() && msi_np == pcie->np) {
> -		ret = brcm_pcie_enable_msi(pcie);
> +	if (pci_msi_enabled()) {
> +		struct device_node *msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
> +
> +		if (msi_np == pcie->np)
> +			ret = brcm_pcie_enable_msi(pcie);
> +
> +		of_node_put(msi_np);
> +
>  		if (ret) {
>  			dev_err(pcie->dev, "probe of internal MSI failed");
>  			goto fail;
> -- 
> 2.47.0
> 

-- 
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