tty: Introduce a tty_port generic block_til_ready

Start sucking more commonality out of the drivers into a single piece of
core code.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 77 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index db53db91ae4a..bac55cf44243 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -838,82 +838,6 @@ static int isicom_carrier_raised(struct tty_port *port)
         return (ip->status & ISI_DCD)?1 : 0;
 }
 
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
-        struct isi_port *ip)
-{
-        struct tty_port *port = &ip->port;
-        int do_clocal = 0, retval;
-        unsigned long flags;
-        DECLARE_WAITQUEUE(wait, current);
-        int cd;
-
-        /* block if port is in the process of being closed */
-
-        if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
-                pr_dbg("block_til_ready: close in progress.\n");
-                interruptible_sleep_on(&port->close_wait);
-                if (port->flags & ASYNC_HUP_NOTIFY)
-                        return -EAGAIN;
-                else
-                        return -ERESTARTSYS;
-        }
-
-        /* if non-blocking mode is set ... */
-
-        if ((filp->f_flags & O_NONBLOCK) ||
-                        (tty->flags & (1 << TTY_IO_ERROR))) {
-                pr_dbg("block_til_ready: non-block mode.\n");
-                port->flags |= ASYNC_NORMAL_ACTIVE;
-                return 0;
-        }
-
-        if (C_CLOCAL(tty))
-                do_clocal = 1;
-
-        /* block waiting for DCD to be asserted, and while
-                                                callout dev is busy */
-        retval = 0;
-        add_wait_queue(&port->open_wait, &wait);
-
-        spin_lock_irqsave(&port->lock, flags);
-        if (!tty_hung_up_p(filp))
-                port->count--;
-        port->blocked_open++;
-        spin_unlock_irqrestore(&port->lock, flags);
-
-        while (1) {
-                tty_port_raise_dtr_rts(port);
-
-                set_current_state(TASK_INTERRUPTIBLE);
-                if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
-                        if (port->flags & ASYNC_HUP_NOTIFY)
-                                retval = -EAGAIN;
-                        else
-                                retval = -ERESTARTSYS;
-                        break;
-                }
-                cd = tty_port_carrier_raised(port);
-                if (!(port->flags & ASYNC_CLOSING) &&
-                                (do_clocal || cd))
-                        break;
-                if (signal_pending(current)) {
-                        retval = -ERESTARTSYS;
-                        break;
-                }
-                schedule();
-        }
-        set_current_state(TASK_RUNNING);
-        remove_wait_queue(&port->open_wait, &wait);
-        spin_lock_irqsave(&port->lock, flags);
-        if (!tty_hung_up_p(filp))
-                port->count++;
-        port->blocked_open--;
-        if (retval == 0)
-                port->flags |= ASYNC_NORMAL_ACTIVE;
-        spin_unlock_irqrestore(&port->lock, flags);
-        return 0;
-}
-
 static int isicom_open(struct tty_struct *tty, struct file *filp)
 {
         struct isi_port *port;
@@ -940,12 +864,13 @@ static int isicom_open(struct tty_struct *tty, struct file *filp)
 
         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);
         if (error == 0)
-                error = block_til_ready(tty, filp, port);
+                error = tty_port_block_til_ready(&port->port, tty, filp);
         return error;
 }