linux-kernel - Re: [PATCH] Update MCP55 quirk to not affect non HyperTransport variants

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Date:	Fri, 10 Dec 2010 06:54:41 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	kexec@...ts.infradead.org, Vivek Goyal <vgoyal@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>, stable@...nel.org
Subject: Re: [PATCH] Update MCP55 quirk to not affect non HyperTransport
 variants

On Thu, Dec 09, 2010 at 03:40:41PM -0800, Andrew Morton wrote:
> On Wed,  8 Dec 2010 09:47:48 -0500
> Neil Horman <nhorman@...driver.com> wrote:
> 
> > I wrote this quirk awhile ago to properly setup MCP55 chips on hypertransport
> > busses so that interrupts reached whatever cpu happend to boot the kdump kernel.
> > while that works well, it was recently shown to me that a a non-hypertransport
> > variant of the MCP55 exists, and on those system the register that this quirk
> > manipulates causes hangs if you write to it.  Since the quirk was only meant to
> > handle errors found on MCP55 chips that have a HT interface, this patch adds a
> > filter to make sure the chip is an HT capable before making the needed register
> > adjustment.  This lets the broken MCP55s work with kdump while not breaking the
> > non-HT variants.
> > 
> > Resolves https://bugzilla.kernel.org/show_bug.cgi?id=23952
> > 
> > Tested successfully by the reporter and myself.
> > 
> > Reported-by: Mathieu B__rard <mathieu@...rard.eu>
> > CC: linux-pci@...r.kernel.org
> > CC: kexec@...ts.infradead.org
> > CC: Vivek Goyal <vgoyal@...hat.com>
> > CC: Jesse Barnes <jbarnes@...tuousgeek.org>
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> That needed a Cc:<stable@...nel.org> as well.  Please don't forget to
> remember -stable.
Thanks, Cc'ing stable on the thread

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