1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index e48c608a8fa8..92e337c18839 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -152,6 +152,8 @@
  *      This routine notifies the tty driver that it should stop
  *      outputting characters to the tty device.  
  *
+ *      Called with ->flow_lock held. Serialized with start() method.
+ *
  *      Optional:
  *
  *      Note: Call stop_tty not this method.
@@ -161,6 +163,8 @@
  *      This routine notifies the tty driver that it resume sending
  *      characters to the tty device.
  *
+ *      Called with ->flow_lock held. Serialized with stop() method.
+ *
  *      Optional:
  *
  *      Note: Call start_tty not this method.