Commit b3b57646 authored by Rob Herring's avatar Rob Herring Committed by Greg Kroah-Hartman
Browse files

tty: serial_core: convert uart_open to use tty_port_open 



tty_port_open handles much of the common parts of tty opening. Convert
uart_open to use it and move the serial_core specific parts into
tty_port.activate function. This will be needed to use tty_port functions
directly from in kernel clients.

The tricky part is uart_port_startup can return positive values to allow
setserial to configure the port. We now return the positive value to
tty_port_open so that the tty is not marked as initialized and then set the
return value in uart_open to 0.

Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ebaa81c7

drivers/tty/serial/serial_core.c

+23 −47
Original line number Diff line number Diff line
@@ -235,18 +235,9 @@ static int uart_startup(struct tty_struct *tty, struct uart_state *state, 
	if (tty_port_initialized(port))

		return 0;



	/*

	 * Set the TTY IO error marker - we will only clear this

	 * once we have successfully opened the port.

	 */

	set_bit(TTY_IO_ERROR, &tty->flags);



	retval = uart_port_startup(tty, state, init_hw);

	if (!retval) {

		tty_port_set_initialized(port, 1);

		clear_bit(TTY_IO_ERROR, &tty->flags);

	} else if (retval > 0)

		retval = 0;

	if (retval)

		set_bit(TTY_IO_ERROR, &tty->flags);



	return retval;

}
@@ -972,8 +963,11 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 
			}

			uart_change_speed(tty, state, NULL);

		}

	} else

	} else {

		retval = uart_startup(tty, state, 1);

		if (retval > 0)

			retval = 0;

	}

 exit:

	return retval;

}
@@ -1139,6 +1133,8 @@ static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 
		uport->ops->config_port(uport, flags);



		ret = uart_startup(tty, state, 1);

		if (ret > 0)

			ret = 0;

	}

out:

	mutex_unlock(&port->mutex);
@@ -1711,52 +1707,31 @@ static int uart_open(struct tty_struct *tty, struct file *filp) 
	struct uart_driver *drv = tty->driver->driver_state;

	int retval, line = tty->index;

	struct uart_state *state = drv->state + line;

	struct tty_port *port = &state->port;

	struct uart_port *uport;



	pr_debug("uart_open(%d) called\n", line);

	tty->driver_data = state;



	spin_lock_irq(&port->lock);

	++port->count;

	spin_unlock_irq(&port->lock);

	retval = tty_port_open(&state->port, tty, filp);

	if (retval > 0)

		retval = 0;



	/*

	 * We take the semaphore here to guarantee that we won't be re-entered

	 * while allocating the state structure, or while we request any IRQs

	 * that the driver may need.  This also has the nice side-effect that

	 * it delays the action of uart_hangup, so we can guarantee that

	 * state->port.tty will always contain something reasonable.

	 */

	if (mutex_lock_interruptible(&port->mutex)) {

		retval = -ERESTARTSYS;

		goto end;

	return retval;

}



static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)

{

	struct uart_state *state = container_of(port, struct uart_state, port);

	struct uart_port *uport;



	uport = uart_port_check(state);

	if (!uport || uport->flags & UPF_DEAD) {

		retval = -ENXIO;

		goto err_unlock;

	}

	if (!uport || uport->flags & UPF_DEAD)

		return -ENXIO;



	tty->driver_data = state;

	uport->state = state;

	port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;

	tty_port_tty_set(port, tty);



	/*

	 * Start up the serial port.

	 */

	retval = uart_startup(tty, state, 0);



	/*

	 * If we succeeded, wait until the port is ready.

	 */

err_unlock:

	mutex_unlock(&port->mutex);

	if (retval == 0)

		retval = tty_port_block_til_ready(port, tty, filp);

end:

	return retval;

	return uart_startup(tty, state, 0);

}



static const char *uart_type(struct uart_port *port)
@@ -2470,6 +2445,7 @@ static const struct tty_operations uart_ops = { 
static const struct tty_port_operations uart_port_ops = {

	.carrier_raised = uart_carrier_raised,

	.dtr_rts	= uart_dtr_rts,

	.activate	= uart_port_activate,

};



/**

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