Commit e8398b8a authored by Jiri Slaby (SUSE)'s avatar Jiri Slaby (SUSE) Committed by Greg Kroah-Hartman
Browse files

tty: introduce tty_port_tty guard() 



Having this, guards like these work:
  scoped_guard(tty_port_tty, port)
    tty_wakeup(scoped_tty());

See e.g. "tty_port: use scoped_guard()" later in this series.

The definitions depend on CONFIG_TTY. It's due to tty_kref_put().
On !CONFIG_TTY, it is an inline and its declaration would conflict. The
guards are not needed in that case, of course.

Signed-off-by: default avatar"Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250814072456.182853-3-jirislaby@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4847d118

include/linux/tty_port.h

+14 −0
Original line number Diff line number Diff line
@@ -270,4 +270,18 @@ static inline void tty_port_tty_vhangup(struct tty_port *port) 
	__tty_port_tty_hangup(port, false, false);

}



#ifdef CONFIG_TTY

void tty_kref_put(struct tty_struct *tty);

__DEFINE_CLASS_IS_CONDITIONAL(tty_port_tty, true);

__DEFINE_UNLOCK_GUARD(tty_port_tty, struct tty_struct, tty_kref_put(_T->lock));

static inline class_tty_port_tty_t class_tty_port_tty_constructor(struct tty_port *tport)

{

	class_tty_port_tty_t _t = {

		.lock = tty_port_tty_get(tport),

	};

	return _t;

}

#define scoped_tty()	((struct tty_struct *)(__guard_ptr(tty_port_tty)(&scope)))

#endif



#endif