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Subject[PATCH 4.9 60/61] rtc: snvs: add a missing write sync
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 7bb633b1a9812a6b9f3e49d0cf17f60a633914e5 ]

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>
---
drivers/rtc/rtc-snvs.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index 3e8fd33c2576..9af591d5223c 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -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 */
--
2.19.1


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