linux-kernel - [PATCH 3.12 88/91] PM / devfreq: Fix governor

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Message-Id: <9f102bae333812d94c1ced6add991d5cb6f43e1f.1452015822.git.jslaby@suse.cz>
Date:	Tue,  5 Jan 2016 18:47:12 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Oliver Neukum <ONeukum@...e.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 88/91] PM / devfreq: Fix governor_store()

From: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>

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

===============

commit 14a21e7ba8cf6eab968310c92ca19a00f13ce3d9 upstream.

Writing the currently set governor into sysfs currently
seems to fail.
Fix this by setting the return code to zero before
leaving governor_store().

Signed-off-by: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Cc: Oliver Neukum <ONeukum@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/devfreq/devfreq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index c99c00d35d34..ab1cec5548f0 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -730,8 +730,10 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
 		ret = PTR_ERR(governor);
 		goto out;
 	}
-	if (df->governor == governor)
+	if (df->governor == governor) {
+		ret = 0;
 		goto out;
+	}
 
 	if (df->governor) {
 		ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
-- 
2.6.4

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