linux-kernel - [PATCH 3.16 346/357] cpufreq: update cpufreq

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Message-Id: <20141003212943.845595412@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:32:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 3.16 346/357] cpufreq: update cpufreq_suspended after stopping governors

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Viresh Kumar <viresh.kumar@...aro.org>

commit b1b12babe3b72cfb08b875245e5a5d7c2747c772 upstream.

Commit 8e30444e1530 ("cpufreq: fix cpufreq suspend/resume for intel_pstate")
introduced a bug where the governors wouldn't be stopped anymore for
->target{_index}() drivers during suspend. This happens because
'cpufreq_suspended' is updated before stopping the governors during suspend
and due to this __cpufreq_governor() would return early due to this check:

	/* Don't start any governor operations if we are entering suspend */
	if (cpufreq_suspended)
		return 0;

Fixes: 8e30444e1530 ("cpufreq: fix cpufreq suspend/resume for intel_pstate")
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpufreq/cpufreq.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1666,10 +1666,8 @@ void cpufreq_suspend(void)
 	if (!cpufreq_driver)
 		return;
 
-	cpufreq_suspended = true;
-
 	if (!has_target())
-		return;
+		goto suspend;
 
 	pr_debug("%s: Suspending Governors\n", __func__);
 
@@ -1682,6 +1680,9 @@ void cpufreq_suspend(void)
 			pr_err("%s: Failed to suspend driver: %p\n", __func__,
 				policy);
 	}
+
+suspend:
+	cpufreq_suspended = true;
 }
 
 /**


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