From: Andrew Morton <akpm@linux-foundation.org>
Date: Sat, 21 Jul 2012 00:55:04 +0000 (+1000)
Subject: drivers/rtc/rtc-r9701.c: check that r9701_set_datetime() succeeded
X-Git-Tag: next-20120725~1^2~47
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ab5ff933ab2c372e76d6fc5e09fe287a7f3504aa;p=karo-tx-linux.git

drivers/rtc/rtc-r9701.c: check that r9701_set_datetime() succeeded

When the driver detects that the clock time is invalid, it attempts to
write a sane time into the hardware.  We curently assume that everything
is OK is those writes succeeded.  But it is better to re-read the time
from the hardware to ensure that the new settings got there OK.

Cc: Devendra Naga <devendra.aaru@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Andreas Dumberger <andreas.dumberger@tqs.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/rtc/rtc-r9701.c b/drivers/rtc/rtc-r9701.c
index e6c34c024706..2c183ebff715 100644
--- a/drivers/rtc/rtc-r9701.c
+++ b/drivers/rtc/rtc-r9701.c
@@ -147,7 +147,8 @@ static int __devinit r9701_probe(struct spi_device *spi)
 		dt.tm_mon  = 0;
 		dt.tm_year = 100;
 
-		if (r9701_set_datetime(&spi->dev, &dt)) {
+		if (r9701_set_datetime(&spi->dev, &dt) ||
+				r9701_get_datetime(&spi->dev, &dt)) {
 			dev_err(&spi->dev, "cannot repair RTC register\n");
 			return -ENODEV;
 		}