linux-kernel - [11/53] drivers/rtc/rtc-s3c.c: fix driver clock enable/disable balance issues

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Date:	Fri, 16 Dec 2011 11:45:08 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jonghwan Choi <jhbird.choi@...sung.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: [11/53] drivers/rtc/rtc-s3c.c: fix driver clock enable/disable balance issues

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

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

From: Jonghwan Choi <jhbird.choi@...sung.com>

commit 2dbcd05f1e9e0932833d16dab1696176fc164b07 upstream.

If an error occurs after the clock is enabled, the enable/disable state
can become unbalanced.

Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
Cc: Alessandro Zummo <a.zummo@...ertech.it>
Acked-by: Kukjin Kim <kgene.kim@...sung.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/rtc/rtc-s3c.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -202,7 +202,6 @@ static int s3c_rtc_settime(struct device
 	void __iomem *base = s3c_rtc_base;
 	int year = tm->tm_year - 100;
 
-	clk_enable(rtc_clk);
 	pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 		 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 		 tm->tm_hour, tm->tm_min, tm->tm_sec);
@@ -214,6 +213,7 @@ static int s3c_rtc_settime(struct device
 		return -EINVAL;
 	}
 
+	clk_enable(rtc_clk);
 	writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 	writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 	writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);


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