linux-kernel - Re: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to IRQ

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Message-ID: <X/WtBj9bLp+kr+jE@kroah.com>
Date:   Wed, 6 Jan 2021 13:28:54 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     李捷 <jie6.li@...sung.com>
Cc:     "mst@...hat.com" <mst@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        何兴 <xing84.he@...sung.com>,
        吕高飞 <gaofei.lv@...sung.com>
Subject: Re: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq
 equals to IRQ_NOTCONNECTED

On Wed, Jan 06, 2021 at 07:48:51PM +0800, 李捷 wrote:
> From 0fbcd7e386898d829d3000d094358a91e626ee4a Mon Sep 17 00:00:00 2001
> From: Jie Li <jie6.li@...sung.com>
> Date: Mon, 7 Dec 2020 08:05:07 +0800
> Subject: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to
>  IRQ_NOTCONNECTED
> 
> Some devices use 255 as default value of Interrupt Line register, and this
> maybe causes pdev->irq is set as IRQ_NOTCONNECTED in some scenarios. For
> example, NVMe controller connects to Intel Volume Management Device (VMD).
> In this situation, IRQ_NOTCONNECTED means INTx line is not connected, not
> fault. If bind uio_pci_generic to these devices, uio frame will return
> -ENOTCONN through request_irq.
> 
> This patch allows binding uio_pci_generic to device with dev->irq of
> IRQ_NOTCONNECTED.
> 
> Signed-off-by: Jie Li <jie6.li@...sung.com>
> Acked-by: Kyungsan Kim <ks0204.kim@...sung.com>
> ---
>  drivers/uio/uio_pci_generic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
> index b8e44d16279f..c7d681fef198 100644
> --- a/drivers/uio/uio_pci_generic.c
> +++ b/drivers/uio/uio_pci_generic.c
> @@ -92,7 +92,7 @@ static int probe(struct pci_dev *pdev,
>   gdev->info.version = DRIVER_VERSION;
>   gdev->info.release = release;
>   gdev->pdev = pdev;
> - if (pdev->irq) {
> + if (pdev->irq && (pdev->irq != IRQ_NOTCONNECTED)) {
>    gdev->info.irq = pdev->irq;
>    gdev->info.irq_flags = IRQF_SHARED;
>    gdev->info.handler = irqhandler;
> --
> 2.17.1
> 
>  
> 
>  
> 
> Best regards, 
> 
> Jie Li
> 
> [cid]
> 
> *
> 




Hi,

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