linux-kernel - [PATCH] rtc: sa1100: detect rcnr overflow with dates after 2038

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Date:	Tue, 19 Jan 2016 01:57:11 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	Rob Herring <robh@...nel.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] rtc: sa1100: detect rcnr overflow with dates after 2038

rcnr will overflow in 2038, detect that overflow when setting the time and
get rid of the deprecated rtc_tm_to_time()

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/rtc/rtc-sa1100.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index c2187bf6c7e4..239dd3d7df1b 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -162,13 +162,16 @@ static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct sa1100_rtc *info = dev_get_drvdata(dev);
-	unsigned long time;
+	time64_t time;
 	int ret;
 
-	ret = rtc_tm_to_time(tm, &time);
-	if (ret == 0)
-		writel_relaxed(time, info->rcnr);
-	return ret;
+	time = rtc_tm_to_time64(tm);
+	if (time > U32_MAX)
+		return -EINVAL;
+
+	writel_relaxed(time, info->rcnr);
+
+	return 0;
 }
 
 static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-- 
2.5.0