From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: Wed, 28 Feb 2018 21:50:53 +0000 (+0100)
Subject: rtc: fix rtc_time64_to_tm for 3477
X-Git-Tag: v4.19~1240^2~29
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f18046c50d2bb726538a83dfb035bfa592779e9c;p=platform%2Fkernel%2Flinux-rpi.git

rtc: fix rtc_time64_to_tm for 3477

The current correction for leap years will fail in 3477. 3476-12-31 being
3477-01-00 because this is 366 leap years after 1970 and 3477 isn't a leap
year.

Fix that by looping over until days is positive or zero.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---

diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index ad5bb21..4a3c0f3 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -65,7 +65,7 @@ void rtc_time64_to_tm(time64_t time, struct rtc_time *tm)
 	days -= (year - 1970) * 365
 		+ LEAPS_THRU_END_OF(year - 1)
 		- LEAPS_THRU_END_OF(1970 - 1);
-	if (days < 0) {
+	while (days < 0) {
 		year -= 1;
 		days += 365 + is_leap_year(year);
 	}