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

* Re: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to IRQ_NOTCONNECTED
       [not found] ` <1269705030.4191784.1609933731961@mail-kr5-0>
@ 2021-01-06 12:28   ` gregkh
  0 siblings, 0 replies; 5+ messages in thread
From: gregkh @ 2021-01-06 12:28 UTC (permalink / raw)
  To: 李捷
  Cc: mst, kvm, linux-kernel, 何兴, 吕高飞

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@samsung.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@samsung.com>
> Acked-by: Kyungsan Kim <ks0204.kim@samsung.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,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
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If you wish to discuss this problem further, or you have questions about
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thanks,

greg k-h's patch email bot

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