linux-kernel - Re: [PATCH v11 1/8] PCI: initialize and release SR-IOV capability

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Date:	Thu, 19 Mar 2009 13:53:12 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Yu Zhao <yu.zhao@...el.com>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 1/8] PCI: initialize and release SR-IOV capability

On Wed, Mar 11, 2009 at 03:25:42PM +0800, Yu Zhao wrote:
> +config PCI_IOV
> +	bool "PCI IOV support"
> +	depends on PCI
> +	help
> +	  PCI-SIG I/O Virtualization (IOV) Specifications support.
> +	  Single Root IOV: allows the creation of virtual PCI devices
> +	  that share the physical resources from a real device.
> +
> +	  When in doubt, say N.

It's certainly shorter than my text, which is nice.  But I think it
still has too much spec-ese and not enough explanation.  How about:

	help
	  I/O Virtualization is a PCI feature supported by some devices
	  which allows them to create virtual devices which share their
	  physical resources.

	  If unsure, say N.

> +	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
> +		if (pdev->is_physfn)
> +			break;
> +	if (list_empty(&dev->bus->devices) || !pdev->is_physfn)
> +		pdev = NULL;

This is still wrong.  If the 'break' condition is not hit, pdev is
pointing to garbage, not to the last pci_dev in the list.

> @@ -270,6 +278,7 @@ struct pci_dev {
>  	struct list_head msi_list;
>  #endif
>  	struct pci_vpd *vpd;
> +	struct pci_sriov *sriov;	/* SR-IOV capability related */

Should be ifdeffed?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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