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rtc; pcf2123: fix possible alarm race condition 

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>
Link: https://lore.kernel.org/r/20190819182656.29744-2-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-08-19 20:26:49 +02:00
parent 5bdf40dab6
commit d0ce6ef714
1 changed files with 4 additions and 4 deletions
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8
drivers/rtc/rtc-pcf2123.c
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@ -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;