tree 425caaac2ad5e3f5687e467d2440b479440a9742
parent 0c42f40e55fd4fe6274962ea17e804f49f5de19e
author Matt Spinler <spinler@us.ibm.com> 1631635627 -0500
committer Matt Spinler <spinler@us.ibm.com> 1631741406 -0500

HwmonTempSensor: Watch for InterfacesRemoved

In the current code, if a temperature sensor is on a removable card and
that card is removed, hwmontempsensor does not know it has been removed
and will keep on trying to read the sensor, resulting in it reporting
the sensor is in error state (Value = NaN and
OperationalStatus.Functional = false).  This isn't ideal because a) The
device isn't in the system so why have a sensor for it and b) This error
reading implies there is something wrong when there isn't.

This commit adds support to remove the sensor from D-Bus when its entity
manager configuration interface has been removed from D-Bus, which
entity-manager will do when a currently passing probe statement no
longer passes.  This could happen, for example, when the EEPROM D-Bus
property it was matching on is removed from D-Bus by the daemon that
keeps EEPROM contents on D-Bus when it detects the EEPROM is no longer
there.

Tested: The D-Bus sensor lifetime matches the entity-manager
configuration object lifetime.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I2946e9adf8995abbfa977128a06a5eca84fb46f5