linux-kernel - Re: [PATCH v5 1/4] PCI/ERR: Add support for resetting the Root Ports in a platform specific way

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Message-ID: <aHYOW3P0wvHo5a1j@wunner.de>
Date: Tue, 15 Jul 2025 10:16:27 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
	Oliver O'Halloran <oohall@...il.com>, Will Deacon <will@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczy??ski <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Niklas Cassel <cassel@...nel.org>,
	Wilfred Mallawa <wilfred.mallawa@....com>,
	Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: Re: [PATCH v5 1/4] PCI/ERR: Add support for resetting the Root Ports
 in a platform specific way

On Tue, Jul 15, 2025 at 01:29:18PM +0530, Manivannan Sadhasivam wrote:
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4964,7 +4964,19 @@ void pci_reset_secondary_bus(struct pci_dev *dev)
>  
>  void __weak pcibios_reset_secondary_bus(struct pci_dev *dev)
>  {
> +	struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
> +	int ret;
> +
> +	if (host->reset_root_port) {
> +		ret = host->reset_root_port(host, dev);
> +		if (ret)
> +			pci_err(dev, "Failed to reset Root Port: %d\n", ret);
> +
> +		return;
> +	}
> +

There used to be a pci_is_root_bus() check here:

https://lore.kernel.org/r/20250524185304.26698-2-manivannan.sadhasivam@linaro.org/

Thanks,

Lukas