linux-kernel - Re: [PATCH] PCI: hv: fix reading of PCI_INTERRUPT_LINE and PCI_INTERRUPT

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Date: Fri, 21 Jun 2024 20:32:33 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
Cc: Wei Liu <wei.liu@...nel.org>, Michael Kelley <mhklinux@...look.com>,
	Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jake Oshins <jakeo@...rosoft.com>,
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: hv: fix reading of PCI_INTERRUPT_LINE and
 PCI_INTERRUPT_PIN

On Fri, Jun 21, 2024 at 04:03:27AM -0700, Saurabh Singh Sengar wrote:
> On Fri, Jun 21, 2024 at 06:19:05AM +0000, Wei Liu wrote:
> > On Fri, Jun 21, 2024 at 03:15:19AM +0000, Michael Kelley wrote:
> > > From: Wei Liu <wei.liu@...nel.org> Sent: Thursday, June 20, 2024 6:48 PM
> > > > 
> > > > The intent of the code snippet is to always return 0 for both fields.
> > > > The check is wrong though. Fix that.
> > > > 
> > > > This is discovered by this call in VFIO:
> > > > 
> > > >     pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
> > > > 
> > > > The old code does not set *val to 0 because the second half of the check is
> > > > incorrect.
> > > > 
> > > > Fixes: 4daace0d8ce85 ("PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V
> > > > VMs")
> 
> 12 characters are preferred for Fixes commit id.
> 'Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V VMs")'

Fixed. Thanks.