tty: remove tty NULL check from __do_SAK()

Both do_SAK_work() and vc_SAK() provide a valid tty to __do_SAK(), so
remove the check.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211118071911.12059-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 829944dfaf48bbbc233e809b50c8c703f6e41bf0..8e653bb4d7c733faf619d8b31b01b148ddcd831d 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3033,9 +3033,6 @@ void __do_SAK(struct tty_struct *tty)
        int             i;
        unsigned long flags;
 
-       if (!tty)
-               return;
-
        spin_lock_irqsave(&tty->ctrl.lock, flags);
        session = get_pid(tty->ctrl.session);
        spin_unlock_irqrestore(&tty->ctrl.lock, flags);