[rtc-linux] [PATCH] rtc: as3772: Fix off-by-one error in month value

[Felix Janda <felix.janda@posteo.de>]

The RTC's month value starts at 1, whereas the kernel's starts at 0.

Signed-off-by: Felix Janda <felix.janda@posteo.de>
---
This is my first kernel patch. It's content is actually from

https://chromium.googlesource.com/chromiumos/third_party/kernel-next/+/9ce8d10f39c441642fba58ab8248d78951cec7a7

How can this be acknowledged? The patch from the chromiumos kernel
can't be taken as it is, can it?
---
 drivers/rtc/rtc-as3722.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-as3722.c b/drivers/rtc/rtc-as3722.c
index 9f38eda..56cc582 100644
--- a/drivers/rtc/rtc-as3722.c
+++ b/drivers/rtc/rtc-as3722.c
@@ -45,7 +45,7 @@ static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
 	rbuff[1] = bin2bcd(tm->tm_min);
 	rbuff[2] = bin2bcd(tm->tm_hour);
 	rbuff[3] = bin2bcd(tm->tm_mday);
-	rbuff[4] = bin2bcd(tm->tm_mon);
+	rbuff[4] = bin2bcd(tm->tm_mon + 1);
 	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
 }
 
@@ -55,7 +55,7 @@ static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
 	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
 	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
 	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
-	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F);
+	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
 	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
 	return;
 }
-- 
2.3.6

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