linux-kernel - Re: [PATCH] PCI: Fix devfn for VPD access through function 0

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Date:	Wed, 23 Sep 2015 11:19:39 -0600
From:	Myron Stowe <myron.stowe@...il.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci <linux-pci@...r.kernel.org>, mark.d.rustad@...el.com,
	Myron Stowe <myron.stowe@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Fix devfn for VPD access through function 0

On Tue, Sep 15, 2015 at 11:17 AM, Alex Williamson
<alex.williamson@...hat.com> wrote:
> Commit 932c435caba8 ("PCI: Add dev_flags bit to access VPD through
> function 0") passes PCI_SLOT(devfn) for the devfn parameter of
> pci_get_slot().  Generally this works because we're fairly well
> guaranteed that a PCIe device is at slot address 0, but for the
> general case, including conventional PCI, it's incorrect.  We need
> to get the slot and then convert it back into a devfn.
>
> Fixes: 932c435caba8 ("PCI: Add dev_flags bit to access VPD through function 0")
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> Cc: stable@...r.kernel.org
> ---
>
> Since the original patch and quirk was marked for stable and applies
> to all Intel NICs, regardless of the bus type, I assume this needs to
> chase it or VPD might disappear on e1000/e100 if it currently exists.
>
>  drivers/pci/access.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/access.c b/drivers/pci/access.c
> index 769f7e3..5a5f0a7 100644
> --- a/drivers/pci/access.c
> +++ b/drivers/pci/access.c
> @@ -442,7 +442,8 @@ static const struct pci_vpd_ops pci_vpd_pci22_ops = {
>  static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
>                                void *arg)
>  {
> -       struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
> +       struct pci_dev *tdev = pci_get_slot(dev->bus,
> +                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
>         ssize_t ret;
>
>         if (!tdev)
> @@ -456,7 +457,8 @@ static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
>  static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count,
>                                 const void *arg)
>  {
> -       struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
> +       struct pci_dev *tdev = pci_get_slot(dev->bus,
> +                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
>         ssize_t ret;
>
>         if (!tdev)
> @@ -475,7 +477,8 @@ static const struct pci_vpd_ops pci_vpd_f0_ops = {
>
>  static int pci_vpd_f0_dev_check(struct pci_dev *dev)
>  {
> -       struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
> +       struct pci_dev *tdev = pci_get_slot(dev->bus,
> +                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
>         int ret = 0;
>
>         if (!tdev)
>
> --
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Acked-by: Myron Stowe <myron.stowe@...hat.com>
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