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Subject[PATCH v3 2/9] rtc; pcf2123: fix possible alarm race condition
Date
Clear the flag after disabling the alarm to ensure the alarm doesn't fire
between clearing the flag and disabling the alarm.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-pcf2123.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c
index 5f604d83289c..829d7a2dd950 100644
--- a/drivers/rtc/rtc-pcf2123.c
+++ b/drivers/rtc/rtc-pcf2123.c
@@ -274,13 +274,13 @@ static int pcf2123_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)

dev_dbg(dev, "%s: alm is %ptR\n", __func__, &alm->time);

- /* Ensure alarm flag is clear */
- ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AF, 0);
+ /* Disable alarm interrupt */
+ ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AIE, 0);
if (ret)
return ret;

- /* Disable alarm interrupt */
- ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AIE, 0);
+ /* Ensure alarm flag is clear */
+ ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AF, 0);
if (ret)
return ret;

--
2.21.0
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