trezor/loop: add loop.close()

src/apps/fido_u2f/__init__.py

@@ -451,7 +451,8 @@ class ConfirmState:
     def kill(self) -> None:
         if self.task is not None:
             workflow.onclose(self.task)
-            self.task.close()
+            loop.close(self.task)
+            self.task = None
 
     async def confirm(self) -> None:
         from trezor.ui.confirm import HoldToConfirmDialog

src/trezor/loop.py

@@ -65,6 +65,12 @@ def unpause(task):
             _paused[iface].remove(task)
 
 
+def close(task):
+    unschedule(task)
+    unpause(task)
+    task.close()
+
+
 def run():
     '''
     Loop forever, stepping through scheduled tasks and awaiting I/O events
@@ -259,9 +265,7 @@ class wait(Syscall):
     def exit(self):
         for task in self.scheduled:
             if task not in self.finished:
-                unpause(task)
-                unschedule(task)
-                task.close()
+                close(task)
 
     async def _wait(self, child):
         try:

src/trezor/wire/codec_v2.py

@@ -227,7 +227,7 @@ class SesssionSupervisor:
     def close(self, sid):
         if sid in self.handling_tasks:
             task = self.handling_tasks.pop(sid)
-            task.close()
+            loop.close(task)
 
     def newsid(self):
         while True:

src/trezor/workflow.py

@@ -26,7 +26,7 @@ def closedefault():
     global default
 
     if default:
-        default.close()
+        loop.close(default)
         default = None
         log.debug(__name__, 'closedefault')