tree a5c887e3f2c3997a62c4297a7992fa4c49e5c1d9
parent 4f484079fd27effce2675ed38f3cdf88da42ab04
author Pavlin Radoslavov <pavlin@google.com> 1492119210 -0700
committer Pavlin Radoslavov <pavlin@google.com> 1492163995 -0700

Fix a race condition during HCI module shutdown

If an HCI event (e.g., incoming event) happens during
HCI module shutdown, and the processing of that event
calls update_command_response_timer() right after
"alarm_free(command_response_timer)" in the beginning
of hci_module_shut_down(), then update_command_response_timer()
will try to schedule an alarm on command_response_timer that is NULL.

Test: Enable/disable Bluetooth, added unit tests
Bug: 37241256
Change-Id: I7fd58446caedc135e906953644201f88b5df32bb
(cherry picked from commit a3292051d9c088769b0f4e46ffaf7c66b1127194)