From d0ce6ef7146692a1540b4dd3a68970da6bcd5207 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Mon, 19 Aug 2019 20:26:49 +0200 Subject: 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 Link: https://lore.kernel.org/r/20190819182656.29744-2-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-pcf2123.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/rtc') 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; -- cgit v1.2.3