Merge commit '3950ae51e' into anoa/dinsic_release_1_21_x

* commit '3950ae51e':
  Ensure that remove_pusher is always async (#7981)
  Ensure the msg property of HttpResponseException is a string. (#7979)
  Remove from the event_relations table when purging historical events. (#7978)
  Add additional logging for SAML sessions. (#7971)
  Add MSC reference to changelog for #7736
  Re-implement unread counts (#7736)
  Various improvements to the docs (#7899)
  Convert storage layer to async/await. (#7963)
  Add an option to disable purge in delete room admin API (#7964)
  Move some log lines from default logger to sql/transaction loggers (#7952)
  Use the JSON module from the std library instead of simplejson. (#7936)
  Fix exit code for `check_line_terminators.sh` (#7970)
  Option to allow server admins to join complex rooms (#7902)
  Fix typo in metrics docs (#7966)
  Add script for finding files with unix line terminators (#7965)
  Convert the remaining media repo code to async / await. (#7947)
  Convert a synapse.events to async/await. (#7949)
  Convert groups and visibility code to async / await. (#7951)
  Convert push to async/await. (#7948)

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/api/auth.py b/synapse/api/auth.py

index 71859c9bc0..afb5702439 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -82,7 +82,7 @@ class Auth(object):
 
     @defer.inlineCallbacks
     def check_from_context(self, room_version: str, event, context, do_sig_check=True):
-        prev_state_ids = yield context.get_prev_state_ids()
+        prev_state_ids = yield defer.ensureDeferred(context.get_prev_state_ids())
         auth_events_ids = yield self.compute_auth_events(
             event, prev_state_ids, for_verification=True
         )