X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Ftty%2Ftty_mutex.c;h=d09293bc0e041417cc15047f84eec0ccd01298eb;hb=d6a5afc432bee13c844dd4b5752b5ab43c8e494c;hp=0efcf713b756e5e7eaf95bf7b5f2a744fc7f6dc0;hpb=c102cb097d9371c2c60049d041ab1f8bdca5ccc2;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index 0efcf713b756..d09293bc0e04 100644
--- a/drivers/tty/tty_mutex.c
+++ b/drivers/tty/tty_mutex.c
@@ -22,6 +22,14 @@ void __lockfunc tty_lock(struct tty_struct *tty)
 }
 EXPORT_SYMBOL(tty_lock);
 
+int tty_lock_interruptible(struct tty_struct *tty)
+{
+	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
+		return -EIO;
+	tty_kref_get(tty);
+	return mutex_lock_interruptible(&tty->legacy_mutex);
+}
+
 void __lockfunc tty_unlock(struct tty_struct *tty)
 {
 	if (tty->magic != TTY_MAGIC) {