Messages in this thread Patch in this message | | | From | Alexandre Belloni <> | Subject | [PATCH v3 2/9] rtc; pcf2123: fix possible alarm race condition | Date | Mon, 19 Aug 2019 20:26:49 +0200 |
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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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