swarming: Roll py-adb to 775c24...

appengine/third_party/python-adb/adb/contrib/adb_commands_safe.py

 # Copyright 2015 Google Inc. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 810 matching lines @@
               self._handle, banner=self._banner, rsa_keys=self._rsa_keys,
               auth_timeout_ms=self._auth_timeout_ms)
           self._failure = None if self._adb_cmd else 'unknown'
           break
         except usb_exceptions.DeviceAuthError as e:
           self._failure = 'unauthorized'
           _LOG.warning('AUTH FAILURE: %s: %s', self.port_path, e)
         except usb_exceptions.LibusbWrappingError as e:
           self._failure = 'usb_failure'
           _LOG.warning('I/O FAILURE: %s: %s', self.port_path, e)
-          self._handle.Reset()
+          # TODO(crbug.com/642440): Reset the handle here if fleet health
+          # regresses and host kernel panics don't subside.
         except adb_protocol.InvalidResponseError as e:
           self._failure = 'protocol_fault'
           _LOG.warning('SYNC FAILURE: %s: %s', self.port_path, e)
         finally:
           # Do not leak the USB handle when we can't talk to the device.
           if not self._adb_cmd:
             self.Close()
 
     if not self._adb_cmd and self._handle:
       _LOG.error('Unexpected close')
@@ skipping 40 matching lines @@
     self.Close()
     if not self._WaitUntilFound(use_serial=use_serial, timeout=timeout):
       return False
     if not self._OpenHandle():
       return False
     return self._Connect(use_serial=use_serial)
 
   def __repr__(self):
     return '<Device %s %s>' % (
         self.port_path, self.serial if self.is_valid else '(broken)')