linux-kernel - Re: [PATCH v2 1/1] PCI/IOV: Fix incorrect cfg

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Date:   Wed, 12 Jun 2019 12:19:10 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     sathyanarayanan.kuppuswamy@...ux.intel.com
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, ashok.raj@...el.com,
        keith.busch@...el.com, mike.campin@...el.com
Subject: Re: [PATCH v2 1/1] PCI/IOV: Fix incorrect cfg_size for VF > 0

On Wed, 12 Jun 2019 10:06:47 -0700
sathyanarayanan.kuppuswamy@...ux.intel.com wrote:

> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> 
> Commit 975bb8b4dc93 ("PCI/IOV: Use VF0 cached config space size for
> other VFs") calculates and caches the cfg_size for VF0 device before
> initializing the pcie_cap of the device which results in using incorrect
> cfg_size for all VF devices > 0. So set pcie_cap of the device before
> calculating the cfg_size of VF0 device.
> 
> Fixes: 975bb8b4dc93 ("PCI/IOV: Use VF0 cached config space size for
> other VFs")
> Cc: Ashok Raj <ashok.raj@...el.com>
> Suggested-by: Mike Campin <mike.campin@...el.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
> 
> Changes since v1:
>  * Fixed a typo in commit message.
> 
>  drivers/pci/iov.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index 3aa115ed3a65..2869011c0e35 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -160,6 +160,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
>  	virtfn->device = iov->vf_device;
>  	virtfn->is_virtfn = 1;
>  	virtfn->physfn = pci_dev_get(dev);
> +	virtfn->pcie_cap = pci_find_capability(virtfn, PCI_CAP_ID_EXP);
>  
>  	if (id == 0)
>  		pci_read_vf_config_common(virtfn);

Why not re-order until after we've setup pcie_cap?

https://lore.kernel.org/linux-pci/20190604143617.0a226555@x1.home/T/#

Thanks,
Alex