1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index 77703a391207..dfa9ec03fa8e 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -19,6 +19,19 @@ void __lockfunc tty_lock(struct tty_struct *tty)
 }
 EXPORT_SYMBOL(tty_lock);
 
+int tty_lock_interruptible(struct tty_struct *tty)
+{
+        int ret;
+
+        if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
+                return -EIO;
+        tty_kref_get(tty);
+        ret = mutex_lock_interruptible(&tty->legacy_mutex);
+        if (ret)
+                tty_kref_put(tty);
+        return ret;
+}
+
 void __lockfunc tty_unlock(struct tty_struct *tty)
 {
         if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))