[FIX] hw_proxy,hw_blackbox_be: make RS-232 drivers protect their device

RS-232 drivers now need to register any device
they are handling in the hw_proxy.rs232_devices map.
This will prevent other drivers from probing them,
possibly messing up with the device.
Any update to rs232_devices must be done while holding
the hw_proxy.rs232_lock.

The hw_scale driver will be updated to use this mechanism
in the next commit, that will also handle a new RS-232
scale protocol.

1 files changed, 7 insertions, 0 deletions

diff --git a/addons/hw_proxy/controllers/main.py b/addons/hw_proxy/controllers/main.py
index d377b5e9a01..e1024772500 100644
--- a/addons/hw_proxy/controllers/main.py
+++ b/addons/hw_proxy/controllers/main.py
@@ -11,6 +11,8 @@ import subprocess
 import simplejson
 import werkzeug
 import werkzeug.wrappers
+from threading import Lock
+
 _logger = logging.getLogger(__name__)
 
 
@@ -30,6 +32,11 @@ BANNED_DEVICES = set([
 # so that 'status' can return the status of all active drivers
 drivers = {}
 
+# keep a list of RS-232 devices that have been recognized by a driver,
+# so other drivers can skip them during probes
+rs232_devices = {}  # {'/path/to/device': 'driver'}
+rs232_lock = Lock() # must be held to update `rs232_devices`
+
 class Proxy(http.Controller):
 
     def get_status(self):