linux-kernel - Re: [PATCH] increment pos before looking for the next cap in __pci_find_next_ht

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Date:	Mon, 08 Jan 2007 10:37:10 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Brice Goglin <brice@...i.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>
Subject: Re: [PATCH] increment pos before looking for the next cap in
	__pci_find_next_ht_cap

On Fri, 2007-01-05 at 17:58 -0600, Robert Hancock wrote:
> Brice Goglin wrote:
> > Hi,
> > 
> > While testing 2.6.20-rc3 on a machine with some CK804 chipsets, we
> > noticed that quirk_nvidia_ck804_msi_ht_cap() was not detecting HT
> > MSI capabilities anymore. It is actually caused by the MSI mapping
> > on the root chipset being the 2nd HT capability in the chain.
> > pci_find_ht_capability() does not seem to find anything but the
> > first HT cap correctly, because it forgets to increment the position
> > before looking for the next cap. The following patch seems to fix it.
> > 
> > At least, this prooves that having a ttl is good idea since the
> > machine would have been stucked in an infinite loop if we didn't
> > have a ttl :)
> > 
> > The patch should go in 2.6.20 since this quirk was working fine in 2.6.19.
> 
> Yes, I saw this on my A8N-SLI Deluxe board as well. This is a regression 
> since MSI is being disabled on the PCI Express slots when it wasn't before..
> 

Guilty as charged :/

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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