Revert "target: poll needed resources only when activating"

This reverts commit d81eb86.

The change could cause inconsistent driver states (e.g. drivers active
for resources that have become unavailable), as not all resources are
processed by update_resources. See the original PR
labgrid-project#1638 for more details.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>

Author: jluebbe

labgrid/target.py

@@ -41,15 +41,15 @@ def interact(self, msg):
         else:
             input(msg)
 
-    def update_resources(self, resources=None):
+    def update_resources(self):
         """
         Iterate over all relevant resources and deactivate any active but
         unavailable resources.
         """
         if (monotonic() - self.last_update) < 0.1:
             return
         self.last_update = monotonic()
-        for resource in self.resources if resources is None else resources:
+        for resource in self.resources:
             resource.poll()
             if not resource.avail and resource.state is BindingState.active:
                 deactivated = self.deactivate(resource)
@@ -71,7 +71,7 @@ def await_resources(self, resources, timeout=None, avail=True):
             timeout (float): optional timeout
             avail (bool): optionally wait until the resources are unavailable with avail=False
         """
-        self.update_resources(resources)
+        self.update_resources()
 
         waiting = set(r for r in resources if r.avail != avail)
         static = set(r for r in waiting if r.get_managed_parent() is None)
@@ -102,7 +102,7 @@ def await_resources(self, resources, timeout=None, avail=True):
                 filter=waiting
             )
 
-        self.update_resources(resources)
+        self.update_resources()
 
     def get_resource(self, cls, *, name=None, wait_avail=True):
         """