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

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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 if 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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2012-07-30 14:41:47 -07:00 committed by Linus Torvalds
parent aa11ec593e
commit 8e74b6edc9
1 changed files with 2 additions and 1 deletions
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3
drivers/rtc/rtc-r9701.c
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@ -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;
}