From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932841Ab2BJXGX (ORCPT ); Fri, 10 Feb 2012 18:06:23 -0500 Received: from mail-pz0-f46.google.com ([209.85.210.46]:45193 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932789Ab2BJWnc (ORCPT ); Fri, 10 Feb 2012 17:43:32 -0500 MIME-Version: 1.0 Message-Id: <20120210222952.697089428@clark.kroah.org> User-Agent: quilt/0.51-15.1 Date: Fri, 10 Feb 2012 14:30:45 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Andreas Herrmann , Dave Jones Subject: [patch 86/86] [CPUFREQ] powernow-k8: Fix indexing issue In-Reply-To: <20120210223514.GA24190@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andreas Herrmann commit a8eb28480e9b637cc78b9aa5e08612ba97e1317a upstream. The driver uses the pstate number from the status register as index in its table of ACPI pstates (powernow_table). This is wrong as this is not a 1-to-1 mapping. For example we can have _PSS information to just utilize Pstate 0 and Pstate 4, ie. powernow-k8: Core Performance Boosting: on. powernow-k8: 0 : pstate 0 (2200 MHz) powernow-k8: 1 : pstate 4 (1400 MHz) In this example the driver's powernow_table has just 2 entries. Using the pstate number (4) as index into this table is just plain wrong. Signed-off-by: Andreas Herrmann Signed-off-by: Dave Jones Signed-off-by: Greg Kroah-Hartman --- drivers/cpufreq/powernow-k8.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/drivers/cpufreq/powernow-k8.c +++ b/drivers/cpufreq/powernow-k8.c @@ -54,6 +54,9 @@ static DEFINE_PER_CPU(struct powernow_k8 static int cpu_family = CPU_OPTERON; +/* array to map SW pstate number to acpi state */ +static u32 ps_to_as[8]; + /* core performance boost */ static bool cpb_capable, cpb_enabled; static struct msr __percpu *msrs; @@ -80,9 +83,9 @@ static u32 find_khz_freq_from_fid(u32 fi } static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, - u32 pstate) + u32 pstate) { - return data[pstate].frequency; + return data[ps_to_as[pstate]].frequency; } /* Return the vco fid for an input fid @@ -926,6 +929,9 @@ static int fill_powernow_table_pstate(st invalidate_entry(powernow_table, i); continue; } + + ps_to_as[index] = i; + /* Frequency may be rounded for these */ if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) || boot_cpu_data.x86 == 0x11) { @@ -1190,7 +1196,8 @@ static int powernowk8_target(struct cpuf powernow_k8_acpi_pst_values(data, newstate); if (cpu_family == CPU_HW_PSTATE) - ret = transition_frequency_pstate(data, newstate); + ret = transition_frequency_pstate(data, + data->powernow_table[newstate].index); else ret = transition_frequency_fidvid(data, newstate); if (ret) { @@ -1203,7 +1210,7 @@ static int powernowk8_target(struct cpuf if (cpu_family == CPU_HW_PSTATE) pol->cur = find_khz_freq_from_pstate(data->powernow_table, - newstate); + data->powernow_table[newstate].index); else pol->cur = find_khz_freq_from_fid(data->currfid); ret = 0;