Commit efb0489e authored Nov 05, 2018 by Nicolin Chen Committed by Guenter Roeck Dec 16, 2018

hwmon: (ina3221) Check channel status for alarms attribute read



There is nothing critically wrong to read these two attributes
without having a is_enabled() check at this point. But reading
the MASK_ENABLE register would clear the CVRF bit according to
the datasheet. So it'd be safer to fence for disabled channels
in order to add pm runtime feature.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

parent df04ced6

drivers/hwmon/ina3221.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -200,6 +200,12 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
		return 0;
		case hwmon_curr_crit_alarm:
		case hwmon_curr_max_alarm:
		/* No actual register read if channel is disabled */
		if (!ina3221_is_enabled(ina, channel)) {
		/* Return 0 for alert flags */
		*val = 0;
		return 0;
		}
		ret = regmap_field_read(ina->fields[reg], &regval);
		if (ret)
		return ret;