tty: replace BKL with a new tty_lock

As a preparation for replacing the big kernel lock
in the TTY layer, wrap all the callers in new
macros tty_lock, tty_lock_nested and tty_unlock.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index b640ef29be1c..622e21ca9a5c 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -692,9 +692,9 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 {
         int ret;
 
-        lock_kernel();
+        tty_lock();
         ret = __ptmx_open(inode, filp);
-        unlock_kernel();
+        tty_unlock();
         return ret;
 }