[PATCH] rtc-s3c.c: fix time setting checks

Fix the year check on setting the time with the S3C24XX RTC driver.  Also
move the debug to before the set to see what is going on if it does fail.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index aacbfea98678..2c7de79c83b9 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -153,24 +153,25 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 {
 	void __iomem *base = s3c_rtc_base;
+	int year = tm->tm_year - 100;
 
-	/* the rtc gets round the y2k problem by just not supporting it */
+	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
+		 tm->tm_year, tm->tm_mon, tm->tm_mday,
+		 tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+	/* we get around y2k by simply not supporting it */
 
-	if (tm->tm_year > 100) {
+	if (year < 0 || year >= 100) {
 		dev_err(dev, "rtc only supports 100 years\n");
 		return -EINVAL;
 	}
 
-	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
-		 tm->tm_year, tm->tm_mon, tm->tm_mday,
-		 tm->tm_hour, tm->tm_min, tm->tm_sec);
-
 	writeb(BIN2BCD(tm->tm_sec),  base + S3C2410_RTCSEC);
 	writeb(BIN2BCD(tm->tm_min),  base + S3C2410_RTCMIN);
 	writeb(BIN2BCD(tm->tm_hour), base + S3C2410_RTCHOUR);
 	writeb(BIN2BCD(tm->tm_mday), base + S3C2410_RTCDATE);
 	writeb(BIN2BCD(tm->tm_mon + 1), base + S3C2410_RTCMON);
-	writeb(BIN2BCD(tm->tm_year - 100), base + S3C2410_RTCYEAR);
+	writeb(BIN2BCD(year), base + S3C2410_RTCYEAR);
 
 	return 0;
 }