{{Cause: }}The `SysUtil.link_info_find()` function previously allowed searching for links by MAC address,

{{Consequence: }}But this introduced ambiguity and could cause false alarms in certain cases (e.g. retrieving the link info by MAC might return the link info that only matches the current MAC instead of the permanent MAC).

{{Fix: }}To ensure reliable behavior, the function `SysUtil.link_info_find()` should accept and match the link info only by interface name.

{{Result: }}Retrieving the link info by interface name only will never introduce link matching ambiguity since the interface name is unique in the kernel.