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rtc: snvs: add a missing write sync

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[ Upstream commit 7bb633b1a9 ]

The clear of the LPTA_EN flag should be synced before writing to the
alarm register. Omitting this synchronization creates a race when
trying to change existing alarm.

Signed-off-by: Guy Shapiro <guy.shapiro@mobi-wize.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guy Shapiro
2017-01-29 11:57:19 +02:00
committed by Greg Kroah-Hartman
parent 36764b4a43
commit 54dbda7447
1 changed files with 1 additions and 0 deletions
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drivers/rtc/rtc-snvs.c
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@@ -187,6 +187,7 @@ static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
rtc_tm_to_time(alrm_tm, &time);
regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
rtc_write_sync_lp(data);
regmap_write(data->regmap, data->offset + SNVS_LPTAR, time);
/* Clear alarm interrupt status bit */