linux-kernel - Re: [PATCH v8 4/9] PCI: Add additional checks for flr reset

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Message-Id: <DFYJOMBIETXN.2WABG9BS0HG2H@linux.ibm.com>
Date: Mon, 26 Jan 2026 14:11:35 +0100
From: "Julian Ruess" <julianr@...ux.ibm.com>
To: "Farhan Ali" <alifm@...ux.ibm.com>, <linux-s390@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Cc: <helgaas@...nel.org>, <lukas@...ner.de>, <alex@...zbot.org>,
        <clg@...hat.com>, <stable@...r.kernel.org>, <schnelle@...ux.ibm.com>,
        <mjrosato@...ux.ibm.com>, <julianr@...ux.ibm.com>,
        "Benjamin Block"
 <bblock@...ux.ibm.com>
Subject: Re: [PATCH v8 4/9] PCI: Add additional checks for flr reset

On Thu Jan 22, 2026 at 8:44 PM CET, Farhan Ali wrote:
> If a device is in an error state, then any reads of device registers can
> return error value. Add addtional checks to validate if a device is in an

typo: additional

> error state before doing an flr reset.
>
> Cc: stable@...r.kernel.org
> Reviewed-by: Benjamin Block <bblock@...ux.ibm.com>
> Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Signed-off-by: Farhan Ali <alifm@...ux.ibm.com>
> ---
>  drivers/pci/pci.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index e7beaf1f65a7..2d0a4c7714af 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4358,12 +4358,19 @@ EXPORT_SYMBOL_GPL(pcie_flr);
>   */
>  int pcie_reset_flr(struct pci_dev *dev, bool probe)
>  {
> +	u32 reg;
> +
>  	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
>  		return -ENOTTY;
>  
>  	if (!(dev->devcap & PCI_EXP_DEVCAP_FLR))
>  		return -ENOTTY;
>  
> +	if (pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &reg)) {
> +		pci_warn(dev, "Device unable to do an FLR\n");
> +		return -ENOTTY;
> +	}
> +
>  	if (probe)
>  		return 0;
>