linux-kernel - Re: 2.6.20-rc2: known unfixed regressions

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Date:	Fri, 29 Dec 2006 15:18:23 -0500 (EST)
From:	Daniel Barkalow <barkalow@...ervon.org>
To:	Adrian Bunk <bunk@...sta.de>
cc:	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>
Subject: Re: 2.6.20-rc2: known unfixed regressions

On Fri, 29 Dec 2006, Adrian Bunk wrote:

> On Fri, Dec 29, 2006 at 01:14:13PM -0500, Daniel Barkalow wrote:
> 
> > There's also http://lkml.org/lkml/2006/12/21/47; the included patch break 
> > my nVidia devices and probably all PCIX devices, so it's not right, but 
> > something has to be done to fix ATI. My guess is a quirk to say that 
> > pci_intx doesn't work on certain devices and should just be skipped, but 
> > I'm not sure if it's just in combination with MSI or not.
> 
> This:
> - does not seem to be a regression and
> - missing MSI support is not such a big problem.
> 
> Considering how many problems patches in this area tend to cause on 
> different hardware, I'm even inclined to say that such patches should 
> only be added during the 2 weeks merge window before -rc1.

(I was only talking about the first issue/patch as being a regression, 
obviously, and forgot that there was more to the email I cited.)

Ah, okay. I somehow missed that all of the devices that were reported 
to break with the MSI change in mainline doesn't support MSI in mainline. 
Actually, I wouldn't be surprised if this issue applied to audio on ATI 
SB450 and later, which (I think) use the hda_intel driver, which supports 
MSI (although I guess it's still defaulting to disabled). If this is true, 
it would be a regression since 2.6.19.

The addition of a quirk to not use pci_intx with MSI on ATI PCI devices 
should be safe (until 2.6.20-rc1, this was the usual kernel behavior), but 
is clearly not critical if mainline doesn't use MSI with any such devices 
anyway.

	-Daniel
*This .sig left intentionally blank*
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