Fix non-thread-safe operation in harmony (#116070)

Fix unsafe thread operation in harmony

https://github.com/home-assistant/core/actions/runs/8808429751/job/24177716644?pr=116066

homeassistant/components/harmony/entity.py

@@ -6,6 +6,7 @@ from collections.abc import Callable
 from datetime import datetime
 import logging
 
+from homeassistant.core import callback
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.event import async_call_later
 
@@ -38,7 +39,7 @@ class HarmonyEntity(Entity):
         _LOGGER.debug("%s: connected to the HUB", self._data.name)
         self.async_write_ha_state()
 
-        self._clear_disconnection_delay()
+        self._async_clear_disconnection_delay()
 
     async def async_got_disconnected(self, _: str | None = None) -> None:
         """Notification that we're disconnected from the HUB."""
@@ -46,15 +47,19 @@ class HarmonyEntity(Entity):
         # We're going to wait for 10 seconds before announcing we're
         # unavailable, this to allow a reconnection to happen.
         self._unsub_mark_disconnected = async_call_later(
-            self.hass, TIME_MARK_DISCONNECTED, self._mark_disconnected_if_unavailable
+            self.hass,
+            TIME_MARK_DISCONNECTED,
+            self._async_mark_disconnected_if_unavailable,
         )
 
-    def _clear_disconnection_delay(self) -> None:
+    @callback
+    def _async_clear_disconnection_delay(self) -> None:
         if self._unsub_mark_disconnected:
             self._unsub_mark_disconnected()
             self._unsub_mark_disconnected = None
 
-    def _mark_disconnected_if_unavailable(self, _: datetime) -> None:
+    @callback
+    def _async_mark_disconnected_if_unavailable(self, _: datetime) -> None:
         self._unsub_mark_disconnected = None
         if not self.available:
             # Still disconnected. Let the state engine know.

homeassistant/components/harmony/remote.py

@@ -138,7 +138,7 @@ class HarmonyRemote(HarmonyEntity, RemoteEntity, RestoreEntity):
 
         _LOGGER.debug("%s: Harmony Hub added", self._data.name)
 
-        self.async_on_remove(self._clear_disconnection_delay)
+        self.async_on_remove(self._async_clear_disconnection_delay)
         self._setup_callbacks()
 
         self.async_on_remove(