linux-kernel - Re: [PATCH v7 9/9] vfio: Remove the pcie check for VFIO_PCI_ERR_IRQ

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Message-Id: <DFSQ35HIT6YT.3DTUUNUOEEDHM@linux.ibm.com>
Date: Mon, 19 Jan 2026 17:56:41 +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>
Subject: Re: [PATCH v7 9/9] vfio: Remove the pcie check for
 VFIO_PCI_ERR_IRQ_INDEX

On Wed Jan 7, 2026 at 7:32 PM CET, Farhan Ali wrote:
> We are configuring the error signaling on the vast majority of devices and
> it's extremely rare that it fires anyway. This allows userspace to be
> notified on errors for legacy PCI devices. The Internal Shared Memory (ISM)
> device on s390x is one such device. For PCI devices on IBM s390x error
> recovery involves platform firmware and notification to operating system
> is done by architecture specific way. So the ISM device can still be
> recovered when notified of an error.
>
> Signed-off-by: Farhan Ali <alifm@...ux.ibm.com>
> ---
>  drivers/vfio/pci/vfio_pci_core.c  | 6 ++----
>  drivers/vfio/pci/vfio_pci_intrs.c | 3 +--
>  2 files changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index c92c6c512b24..0fdce5234914 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -778,8 +778,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_core_device *vdev, int irq_typ
>  			return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
>  		}
>  	} else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
> -		if (pci_is_pcie(vdev->pdev))
> -			return 1;
> +		return 1;
>  	} else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
>  		return 1;
>  	}
> @@ -1157,8 +1156,7 @@ static int vfio_pci_ioctl_get_irq_info(struct vfio_pci_core_device *vdev,
>  	case VFIO_PCI_REQ_IRQ_INDEX:
>  		break;
>  	case VFIO_PCI_ERR_IRQ_INDEX:
> -		if (pci_is_pcie(vdev->pdev))
> -			break;
> +		break;
>  		fallthrough;

Isn't the fallthrough unreachable now?

-- snip --