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Commit b58d13a0 authored by Alan Cox's avatar Alan Cox Committed by Live-CD User
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serial: move port users helper 



This little helper is now tty_port specific and useful generally so move it

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent bdc04e31

drivers/serial/serial_core.c

+2 −4
Original line number Diff line number Diff line
@@ -52,8 +52,6 @@ static struct lock_class_key port_lock_key; 


#define HIGH_BITS_OFFSET	((sizeof(long)-sizeof(int))*8)



#define uart_users(state)	((state)->port.count + (state)->port.blocked_open)



#ifdef CONFIG_SERIAL_CORE_CONSOLE

#define uart_console(port)	((port)->cons && (port)->cons->index == (port)->line)

#else
@@ -758,7 +756,7 @@ static int uart_set_info(struct uart_state *state, 
		/*

		 * Make sure that we are the sole user of this port.

		 */

		if (uart_users(state) > 1)

		if (tty_port_users(port) > 1)

			goto exit;



		/*
@@ -974,7 +972,7 @@ static int uart_do_autoconfig(struct uart_state *state) 
		return -ERESTARTSYS;



	ret = -EBUSY;

	if (uart_users(state) == 1) {

	if (tty_port_users(port) == 1) {

		uart_shutdown(state);



		/*

include/linux/tty.h

+5 −0
Original line number Diff line number Diff line
@@ -467,6 +467,11 @@ extern int tty_port_close_start(struct tty_port *port, 
extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);

extern void tty_port_close(struct tty_port *port,

				struct tty_struct *tty, struct file *filp);

extern inline int tty_port_users(struct tty_port *port)

{

	return port->count + port->blocked_open;

}



extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);

extern int tty_unregister_ldisc(int disc);

extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);