linux-kernel - Re: [PATCH] pci: Account for virtual buses in pci_acs_path

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Message-ID: <501F4D69.9060100@gmail.com>
Date:	Sun, 05 Aug 2012 22:51:53 -0600
From:	David Ahern <dsahern@...il.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: Account for virtual buses in pci_acs_path_enabled

On 8/4/12 12:19 PM, Alex Williamson wrote:
> It's possible to have buses without an associated bridge
> (bus->self == NULL).  SR-IOV can generate such buses.  When
> we find these, skip to the parent bus to look for the next
> ACS test.
>
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> ---
>
> David Ahern reported an oops from iommu drivers passing NULL into
> this function for the same mistake.  Harden this function against
> assuming bus->self is valid as well.  David, please include this
> patch as well as the iommu patches in your testing.

Tested-by: David Ahern <dsahern@...il.com>
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