linux-kernel - [PATCH 09/11] cpufreq: maple: Use 'index' only to index into policy->freq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <4930072c05d216e86acd6246fdbc116bcc8026ac.1464876460.git.viresh.kumar@linaro.org>
Date:	Thu,  2 Jun 2016 19:49:09 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Rafael Wysocki <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Kevin Hilman <khilman@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>, Sekhar Nori <nsekhar@...com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Steven Miao <realmz6@...il.com>
Subject: [PATCH 09/11] cpufreq: maple: Use 'index' only to index into policy->freq_table

Later patches would make changes in cpufreq core, after which
policy->freq_table may be reordered by cpufreq core and it wouldn't be
safe anymore to use 'index' for any other local arrays.

To prepare for that, use policy->freq_table[index].driver_data for other
driver specific usage of 'index'. The 'driver_data' fields are already
set properly by the driver.

Cc: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/maple-cpufreq.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/maple-cpufreq.c b/drivers/cpufreq/maple-cpufreq.c
index d9df89392b84..8ce92ee7dd8d 100644
--- a/drivers/cpufreq/maple-cpufreq.c
+++ b/drivers/cpufreq/maple-cpufreq.c
@@ -133,6 +133,12 @@ static int maple_scom_query_freq(void)
 static int maple_cpufreq_target(struct cpufreq_policy *policy,
 	unsigned int index)
 {
+	/*
+	 * policy->freq_table may be sorted differently, get the index value we
+	 * are concerned about.
+	 */
+	index = policy->freq_table[index].driver_data;
+
 	return maple_scom_switch_freq(index);
 }
 
-- 
2.7.1.410.g6faf27b