linux-kernel - [PATCH 2/5] cpufreq: Only call cpufreq_out_of_sync() with drivers that implement cpufreq

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Message-Id: <1360170133-5066-4-git-send-email-dirk.brandewie@gmail.com>
Date:	Wed,  6 Feb 2013 09:02:10 -0800
From:	dirk.brandewie@...il.com
To:	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Cc:	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: [PATCH 2/5] cpufreq: Only call cpufreq_out_of_sync() with drivers that implement cpufreq_driver.target()

From: Dirk Brandewie <dirk.brandewie@...il.com>

Scaling drivers that implement cpufreq_driver.setpolicy() have
internal governors that do not signal changes via
cpufreq_notify_transition() so the frequncy in the policy will almost
certainly be different than the current frequncy.  Only call
cpufreq_out_of_sync() when the underlying driver implements
cpufreq_driver.target()

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
---
 drivers/cpufreq/cpufreq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index bb45f93..0ba0344 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1798,7 +1798,7 @@ int cpufreq_update_policy(unsigned int cpu)
 			pr_debug("Driver did not initialize current freq");
 			data->cur = policy.cur;
 		} else {
-			if (data->cur != policy.cur)
+			if (data->cur != policy.cur && driver->target)
 				cpufreq_out_of_sync(cpu, data->cur,
 								policy.cur);
 		}
-- 
1.7.7.6

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