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TTY: serial, use tty_port_close_start helper 

After the previous patches, the code is almost identical. There are
few differences in the helper code:
1) flush_buffer when flow_stopped
   * when a user doesn't care about the data, delete it anyways
2) ASYNCB_INITIALIZED test before wait_until_sent_from
   * obviously, there is nothing to wait for if the port is dead
3) drain_delay wait
   * we don't set drain_delay

So we can use the helper now. It indeed removes a bunch of duplicated
code.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2011-11-09 21:33:46 +01:00 committed by Greg Kroah-Hartman
parent 4cb0fbfdc8
commit d30ccf08e8
1 changed files with 1 additions and 39 deletions
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40
drivers/tty/serial/serial_core.c
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@ -1267,46 +1267,8 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
pr_debug("uart_close(%d) called\n", uport->line);
spin_lock_irqsave(&port->lock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&port->lock, flags);
if (tty_port_close_start(port, tty, filp) == 0)
return;
}
if ((tty->count == 1) && (port->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. port->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, "
"port->count is %d\n", port->count);
port->count = 1;
}
if (--port->count < 0) {
printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n",
tty->name, port->count);
port->count = 0;
}
if (port->count) {
spin_unlock_irqrestore(&port->lock, flags);
return;
}
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters by
* setting tty->closing.
*/
set_bit(ASYNCB_CLOSING, &port->flags);
tty->closing = 1;
spin_unlock_irqrestore(&port->lock, flags);
if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent_from_close(tty, port->closing_wait);
/*
* At this point, we stop accepting input. To do this, we