---

yaml
---
r: 267317
b: refs/heads/master
c: a57a7bf
h: refs/heads/master
i:
  267315: 1dbcebc
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bafb0bd24d7e0e0124318625b239a55d58c757a2
+refs/heads/master: a57a7bf3fc7eff00f07eb9c805774d911a3f2472

trunk/include/linux/tty.h

@@ -601,6 +601,24 @@ extern long vt_compat_ioctl(struct tty_struct *tty,
 extern void __lockfunc tty_lock(void) __acquires(tty_lock);
 extern void __lockfunc tty_unlock(void) __releases(tty_lock);
 
+/*
+ * this shall be called only from where BTM is held (like close)
+ *
+ * We need this to ensure nobody waits for us to finish while we are waiting.
+ * Without this we were encountering system stalls.
+ *
+ * This should be indeed removed with BTM removal later.
+ *
+ * Locking: BTM required. Nobody is allowed to hold port->mutex.
+ */
+static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
+		long timeout)
+{
+	tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */
+	tty_wait_until_sent(tty, timeout);
+	tty_lock();
+}
+
 /*
  * wait_event_interruptible_tty -- wait for a condition with the tty lock held
  *