1 files changed, 14 insertions, 9 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 9f47ab540f65..4990ef2b1fb7 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -268,6 +268,7 @@ struct tty_struct {
         struct mutex ldisc_mutex;
         struct tty_ldisc *ldisc;
 
+        struct mutex legacy_mutex;
         struct mutex termios_mutex;
         spinlock_t ctrl_lock;
         /* Termios values are protected by the termios mutex */
@@ -605,8 +606,12 @@ extern long vt_compat_ioctl(struct tty_struct *tty,
 
 /* tty_mutex.c */
 /* functions for preparation of BKL removal */
-extern void __lockfunc tty_lock(void) __acquires(tty_lock);
-extern void __lockfunc tty_unlock(void) __releases(tty_lock);
+extern void __lockfunc tty_lock(struct tty_struct *tty);
+extern void __lockfunc tty_unlock(struct tty_struct *tty);
+extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
+                                struct tty_struct *tty2);
+extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
+                                struct tty_struct *tty2);
 
 /*
  * this shall be called only from where BTM is held (like close)
@@ -621,9 +626,9 @@ extern void __lockfunc tty_unlock(void) __releases(tty_lock);
 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_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
         tty_wait_until_sent(tty, timeout);
-        tty_lock();
+        tty_lock(tty);
 }
 
 /*
@@ -638,16 +643,16 @@ static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
  *
  * Do not use in new code.
  */
-#define wait_event_interruptible_tty(wq, condition)                     \
+#define wait_event_interruptible_tty(tty, wq, condition)                \
 ({                                                                      \
         int __ret = 0;                                                  \
         if (!(condition)) {                                             \
-                __wait_event_interruptible_tty(wq, condition, __ret);   \
+                __wait_event_interruptible_tty(tty, wq, condition, __ret);      \
         }                                                               \
         __ret;                                                          \
 })
 
-#define __wait_event_interruptible_tty(wq, condition, ret)              \
+#define __wait_event_interruptible_tty(tty, wq, condition, ret)         \
 do {                                                                    \
         DEFINE_WAIT(__wait);                                            \
                                                                         \
@@ -656,9 +661,9 @@ do {									\
                 if (condition)                                          \
                         break;                                          \
                 if (!signal_pending(current)) {                         \
-                        tty_unlock();                                   \
+                        tty_unlock(tty);                                        \
                         schedule();                                     \
-                        tty_lock();                                     \
+                        tty_lock(tty);                                  \
                         continue;                                       \
                 }                                                       \
                 ret = -ERESTARTSYS;                                     \