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27 March 2024, 02:37:15 UTC
Revision 49c2fa08a77a7eefa4cbc73601f64984aceacfa7 authored by Neil Horman on 08 December 2010, 14:47:48 UTC, committed by Jesse Barnes on 16 December 2010, 22:07:31 UTC 
PCI: Update MCP55 quirk to not affect non HyperTransport variants
 
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.

Cc: stable@kernel.org
Reported-by: Mathieu Bérard <mathieu@mberard.eu>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
1 parent 6313e3c
History
Tip revision: 49c2fa08a77a7eefa4cbc73601f64984aceacfa7 authored by Neil Horman on 08 December 2010, 14:47:48 UTC
PCI: Update MCP55 quirk to not affect non HyperTransport variants
Tip revision: 49c2fa0
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