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

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Date:	Fri, 05 Jan 2007 17:58:19 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Brice Goglin <brice@...i.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...e.de>, Michael Ellerman <michael@...erman.id.au>
Subject: Re: [PATCH] increment pos before looking for the next cap in
 __pci_find_next_ht_cap

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..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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