139 lines
6.2 KiB
Diff
139 lines
6.2 KiB
Diff
|
Bugzilla: 1054408
|
||
|
|
Upstream-status: Queued for 3.14 and CC'd to stable
|
||
|
|
Delivered-To: jwboyer@gmail.com
|
||
|
|
Received: by 10.76.82.162 with SMTP id j2csp112184oay;
|
||
|
|
Mon, 17 Feb 2014 03:01:52 -0800 (PST)
|
||
|
|
X-Received: by 10.68.164.4 with SMTP id ym4mr26078759pbb.53.1392634911720;
|
||
|
|
Mon, 17 Feb 2014 03:01:51 -0800 (PST)
|
||
|
|
Return-Path: <linux-kernel-owner@vger.kernel.org>
|
||
|
|
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
|
||
|
|
by mx.google.com with ESMTP id xf4si14383267pab.191.2014.02.17.03.01.15
|
||
|
|
for <multiple recipients>;
|
||
|
|
Mon, 17 Feb 2014 03:01:51 -0800 (PST)
|
||
|
|
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
|
||
|
|
Authentication-Results: mx.google.com;
|
||
|
|
spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mail=linux-kernel-owner@vger.kernel.org
|
||
|
|
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
|
||
|
|
id S1752151AbaBQKyA (ORCPT <rfc822;gardner.ben.linux@gmail.com>
|
||
|
|
+ 99 others); Mon, 17 Feb 2014 05:54:00 -0500
|
||
|
|
Received: from e28smtp06.in.ibm.com ([122.248.162.6]:51044 "EHLO
|
||
|
|
e28smtp06.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
|
||
|
|
with ESMTP id S1752134AbaBQKx6 (ORCPT
|
||
|
|
<rfc822;linux-kernel@vger.kernel.org>);
|
||
|
|
Mon, 17 Feb 2014 05:53:58 -0500
|
||
|
|
Received: from /spool/local
|
||
|
|
by e28smtp06.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted
|
||
|
|
for <linux-kernel@vger.kernel.org> from <srivatsa.bhat@linux.vnet.ibm.com>;
|
||
|
|
Mon, 17 Feb 2014 16:23:53 +0530
|
||
|
|
Received: from d28dlp03.in.ibm.com (9.184.220.128)
|
||
|
|
by e28smtp06.in.ibm.com (192.168.1.136) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted;
|
||
|
|
Mon, 17 Feb 2014 16:23:50 +0530
|
||
|
|
Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58])
|
||
|
|
by d28dlp03.in.ibm.com (Postfix) with ESMTP id 80C82125805C;
|
||
|
|
Mon, 17 Feb 2014 16:25:47 +0530 (IST)
|
||
|
|
Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65])
|
||
|
|
by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s1HArhEA64749632;
|
||
|
|
Mon, 17 Feb 2014 16:23:44 +0530
|
||
|
|
Received: from d28av03.in.ibm.com (localhost [127.0.0.1])
|
||
|
|
by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s1HArkHs009945;
|
||
|
|
Mon, 17 Feb 2014 16:23:47 +0530
|
||
|
|
Received: from srivatsabhat.in.ibm.com ([9.79.254.57])
|
||
|
|
by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id s1HAriQk009844;
|
||
|
|
Mon, 17 Feb 2014 16:23:45 +0530
|
||
|
|
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
|
||
|
|
Subject: [PATCH] cpufreq,
|
||
|
|
powernow-k8: Initialize per-cpu data-structures properly
|
||
|
|
To: pierre-list@ossman.eu, rjw@rjwysocki.net
|
||
|
|
Cc: viresh.kumar@linaro.org, linux-pm@vger.kernel.org,
|
||
|
|
linux-kernel@vger.kernel.org,
|
||
|
|
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
|
||
|
|
Date: Mon, 17 Feb 2014 16:18:21 +0530
|
||
|
|
Message-ID: <20140217104821.21147.71463.stgit@srivatsabhat.in.ibm.com>
|
||
|
|
User-Agent: StGIT/0.14.3
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset="utf-8"
|
||
|
|
Content-Transfer-Encoding: 7bit
|
||
|
|
X-TM-AS-MML: disable
|
||
|
|
X-Content-Scanned: Fidelis XPS MAILER
|
||
|
|
x-cbid: 14021710-9574-0000-0000-00000BFDA307
|
||
|
|
Sender: linux-kernel-owner@vger.kernel.org
|
||
|
|
Precedence: bulk
|
||
|
|
List-ID: <linux-kernel.vger.kernel.org>
|
||
|
|
X-Mailing-List: linux-kernel@vger.kernel.org
|
||
|
|
|
||
|
|
The powernow-k8 driver maintains a per-cpu data-structure called powernow_data
|
||
|
|
that is used to perform the frequency transitions. It initializes this data-
|
||
|
|
structure only for the policy->cpu. So, accesses to this data-structure by
|
||
|
|
other CPUs results in various problems because they would have been
|
||
|
|
uninitialized.
|
||
|
|
|
||
|
|
Specifically, if a cpu (!= policy->cpu) invokes the drivers' ->get() function,
|
||
|
|
it returns 0 as the KHz value, since its per-cpu memory doesn't point to
|
||
|
|
anything valid. This causes problems during suspend/resume since
|
||
|
|
cpufreq_update_policy() tries to enforce this (0 KHz) as the current frequency
|
||
|
|
of the CPU, and this madness gets propagated to adjust_jiffies() as well.
|
||
|
|
Eventually, lots of things start breaking down, including the r8169 ethernet
|
||
|
|
card, in one particularly interesting case reported by Pierre Ossman.
|
||
|
|
|
||
|
|
https://bugzilla.kernel.org/show_bug.cgi?id=70311
|
||
|
|
|
||
|
|
Fix this by initializing the per-cpu data-structures of _all_ the CPUs
|
||
|
|
in the policy appropriately.
|
||
|
|
|
||
|
|
Cc: stable@vger.kernel.org
|
||
|
|
Reported-by: Pierre Ossman <pierre@ossman.eu>
|
||
|
|
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
|
||
|
|
---
|
||
|
|
|
||
|
|
drivers/cpufreq/powernow-k8.c | 10 +++++++---
|
||
|
|
1 file changed, 7 insertions(+), 3 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
|
||
|
|
index e10b646..6684e03 100644
|
||
|
|
--- a/drivers/cpufreq/powernow-k8.c
|
||
|
|
+++ b/drivers/cpufreq/powernow-k8.c
|
||
|
|
@@ -1076,7 +1076,7 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol)
|
||
|
|
{
|
||
|
|
struct powernow_k8_data *data;
|
||
|
|
struct init_on_cpu init_on_cpu;
|
||
|
|
- int rc;
|
||
|
|
+ int rc, cpu;
|
||
|
|
|
||
|
|
smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
|
||
|
|
if (rc)
|
||
|
|
@@ -1140,7 +1140,9 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol)
|
||
|
|
pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
|
||
|
|
data->currfid, data->currvid);
|
||
|
|
|
||
|
|
- per_cpu(powernow_data, pol->cpu) = data;
|
||
|
|
+ /* Point all the CPUs in this policy to the same data */
|
||
|
|
+ for_each_cpu(cpu, pol->cpus)
|
||
|
|
+ per_cpu(powernow_data, cpu) = data;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
@@ -1155,6 +1157,7 @@ err_out:
|
||
|
|
static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
|
||
|
|
{
|
||
|
|
struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
|
||
|
|
+ int cpu;
|
||
|
|
|
||
|
|
if (!data)
|
||
|
|
return -EINVAL;
|
||
|
|
@@ -1165,7 +1168,8 @@ static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
|
||
|
|
|
||
|
|
kfree(data->powernow_table);
|
||
|
|
kfree(data);
|
||
|
|
- per_cpu(powernow_data, pol->cpu) = NULL;
|
||
|
|
+ for_each_cpu(cpu, pol->cpus)
|
||
|
|
+ per_cpu(powernow_data, cpu) = NULL;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
--
|
||
|
|
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
|
||
|
|
the body of a message to majordomo@vger.kernel.org
|
||
|
|
More majordomo info at http://vger.kernel.org/majordomo-info.html
|
||
|
|
Please read the FAQ at http://www.tux.org/lkml/
|