From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933176Ab0G3S0X (ORCPT ); Fri, 30 Jul 2010 14:26:23 -0400 Received: from kroah.org ([198.145.64.141]:58382 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759946Ab0G3Rzd (ORCPT ); Fri, 30 Jul 2010 13:55:33 -0400 X-Mailbox-Line: From gregkh@clark.site Fri Jul 30 10:51:40 2010 Message-Id: <20100730175140.795118576@clark.site> User-Agent: quilt/0.48-11.2 Date: Fri, 30 Jul 2010 10:51:36 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Borislav Petkov Subject: [079/205] amd64_edac: Fix syndrome calculation on K8 In-Reply-To: <20100730175238.GA3924@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.34-stable review patch. If anyone has any objections, please let us know. ------------------ From: Borislav Petkov commit 41c310447fe06bcedc22b75752c18b60e0b9521b upstream. When calculating the DCT channel from the syndrome we need to know the syndrome type (x4 vs x8). On F10h, this is read out from extended PCI cfg space register F3x180 while on K8 we only support x4 syndromes and don't have extended PCI config space anyway. Make the code accessing F3x180 F10h only and fall back to x4 syndromes on everything else. Reported-by: Jeffrey Merkey Signed-off-by: Borislav Petkov Signed-off-by: Greg Kroah-Hartman --- drivers/edac/amd64_edac.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -1958,20 +1958,20 @@ static int get_channel_from_ecc_syndrome u32 value = 0; int err_sym = 0; - amd64_read_pci_cfg(pvt->misc_f3_ctl, 0x180, &value); + if (boot_cpu_data.x86 == 0x10) { - /* F3x180[EccSymbolSize]=1, x8 symbols */ - if (boot_cpu_data.x86 == 0x10 && - boot_cpu_data.x86_model > 7 && - value & BIT(25)) { - err_sym = decode_syndrome(syndrome, x8_vectors, - ARRAY_SIZE(x8_vectors), 8); - return map_err_sym_to_channel(err_sym, 8); - } else { - err_sym = decode_syndrome(syndrome, x4_vectors, - ARRAY_SIZE(x4_vectors), 4); - return map_err_sym_to_channel(err_sym, 4); + amd64_read_pci_cfg(pvt->misc_f3_ctl, 0x180, &value); + + /* F3x180[EccSymbolSize]=1 => x8 symbols */ + if (boot_cpu_data.x86_model > 7 && + value & BIT(25)) { + err_sym = decode_syndrome(syndrome, x8_vectors, + ARRAY_SIZE(x8_vectors), 8); + return map_err_sym_to_channel(err_sym, 8); + } } + err_sym = decode_syndrome(syndrome, x4_vectors, ARRAY_SIZE(x4_vectors), 4); + return map_err_sym_to_channel(err_sym, 4); } /*