isicom: split the open method for the isicom device

Again moving towards being able to add a common open method

Signed-off-by: Alan Cox <alan@linux.intel.com>

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 08f5743..426bfdd 100644 (file)
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -846,37 +846,53 @@ static int isicom_carrier_raised(struct tty_port *port)
        return (ip->status & ISI_DCD)?1 : 0;
 }
 
-static int isicom_open(struct tty_struct *tty, struct file *filp)
+static struct tty_port *isicom_find_port(struct tty_struct *tty)
 {
        struct isi_port *port;
        struct isi_board *card;
        unsigned int board;
-       int error, line;
+       int line = tty->index;
 
-       line = tty->index;
        if (line < 0 || line > PORT_COUNT-1)
-               return -ENODEV;
+               return NULL;
        board = BOARD(line);
        card = &isi_card[board];
 
        if (!(card->status & FIRMWARE_LOADED))
-               return -ENODEV;
+               return NULL;
 
        /*  open on a port greater than the port count for the card !!! */
        if (line > ((board * 16) + card->port_count - 1))
-               return -ENODEV;
+               return NULL;
 
        port = &isi_ports[line];
        if (isicom_paranoia_check(port, tty->name, "isicom_open"))
-               return -ENODEV;
+               return NULL;
+
+       return &port->port;
+}
+       
+static int isicom_open(struct tty_struct *tty, struct file *filp)
+{
+       struct isi_port *port;
+       struct isi_board *card;
+       struct tty_port *tport;
+       int error = 0;
 
+       tport = isicom_find_port(tty);
+       if (tport == NULL)
+               return -ENODEV;
+       port = container_of(tport, struct isi_port, port);
+       card = &isi_card[BOARD(tty->index)];
        isicom_setup_board(card);
 
        /* FIXME: locking on port.count etc */
        port->port.count++;
        tty->driver_data = port;
        tty_port_tty_set(&port->port, tty);
-       error = isicom_setup_port(tty);
+       /* FIXME: Locking on Initialized flag */
+       if (!test_bit(ASYNCB_INITIALIZED, &tport->flags))
+               error = isicom_setup_port(tty);
        if (error == 0)
                error = tty_port_block_til_ready(&port->port, tty, filp);
        return error;