tree aaeefc1a7af0ccf38e2846dae6e58bfb5fa919d2
parent 17aba776373e14851a04e6b9ac518622b117b2a1
author Yong Li <yong.b.li@linux.intel.com> 1586939570 +0800
committer Yong Li <yong.b.li@linux.intel.com> 1587102210 +0800

psusensor: Check if the object is still valid in the callback functions

There is a chance that the service will crash if the sensor threshold
is changed. The root cause is that threshold changing will trigger
the deletion of sensors object, when the callback handler is executed
after objects destroyed, the variables of objects are invalid.

Adding a weak_ptr in the callback functions to check if the object
is destroyed already, only access the variables if it is valid.

Tested:
Change/query the PSU sensor threshold using ipmi commands
to trigger the sensor re-creation, the threshold config is correct,
and there is no any psusensor crash log.

Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
Change-Id: Ib8169aeffde18eeaf1a2491d205a808ea15a27d9