Put tether/untether calls into handler queue
BT tethering is the only user of #tether and #untether API.
Enable BT tethering may fail by race between interface status change
and #tether call. In starting BT tethering flow, tethering may receive
pan interface DOWN and UP then PanService call #tether to request for
processing its pan interface. Tethering put interface status change
event into handler queue but it process #tether and #unether calls
right away without order them by queue. It makes tethering handle
binder call #tether before pan interface DOWN even DOWN event arrived
eailer. This cause BT tethering bring down by interface DOWN event
unexpectedly. Although this still can't fix all the race cases of
tethering, but at lesat this could fix the race mentioned above.
Bug: 173310882
Test: manual ON/OFF bt tethering
atest TetheringTests
Change-Id: I2411378aa36ad4371cca12423bb65542cb8df7a1
4 files changed