drm/rockchip: add rk3399 vop big csc support

[firefly-linux-kernel-4.4.55.git] / drivers / tty / tty_mutex.c

diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
index 0efcf713b756e5e7eaf95bf7b5f2a744fc7f6dc0..d09293bc0e041417cc15047f84eec0ccd01298eb 100644 (file)
--- 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) {