[PATCH -next 22/27] tty: Document hangup call tree

[Peter Hurley]

Add at-a-glance call tree for the various hangup methods.

Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
 drivers/tty/tty_io.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 25e85b0..8effd44 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -664,6 +664,19 @@ static int tty_signal_session_leader(struct tty_struct *tty, int exit_session)
  *		  termios_rwsem resetting termios data
  *		  tasklist_lock to walk task list for hangup event
  *		    ->siglock to protect ->signal/->sighand
+ *
+ *	Call tree:
+ *	tty_hangup() =>	do_tty_hangup() -+
+ *					 |
+ *	tty_vhangup() ---------+	 |
+ *	tty_vhangup_self() ----+	 |
+ *	tty_vhangup_session() -+---------+
+ *      				 |
+ *				  __tty_hangup() -> __tty_hangup_standard() -+
+ *									     |
+ *      tty_vhangup_slave() ----> __tty_hangup() -> __tty_vhangup_slave() ---+
+ *									     |
+ *								 __tty_hangup_common()
  */
 static void __tty_hangup_common(struct tty_struct *tty, int exit_session)
 {
-- 
2.1.1

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