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Agere FW643 rev 06, listed as "11c1:5901 (rev 06) (prog-if 10 [OHCI])", produced SBP-2 I/O errors since kernel 2.6.36. Disabling MSI fixes it. Since MSI work on Agere FW643-E (same vendor and device ID, but rev 07), introduce a device revision field into firewire-ohci's quirks list so that different quirks can be defined for older and newer revisions. Reported-by: Jonathan Isom <jeisom@gmail.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: <stable@kernel.org> # 2.6.36.y