linux-kernel - [PATCH 18/69] TTY: isdn, use tty_port_block_til

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Message-Id: <1333367693-3244-19-git-send-email-jslaby@suse.cz>
Date:	Mon,  2 Apr 2012 13:54:02 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	gregkh@...uxfoundation.org
Cc:	alan@...ux.intel.com, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Karsten Keil <isdn@...ux-pingi.de>
Subject: [PATCH 18/69] TTY: isdn, use tty_port_block_til_ready helper

This removes a bunch of duplicated code which does the same as
tty_port_block_til_ready does.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Karsten Keil <isdn@...ux-pingi.de>
---
 drivers/isdn/i4l/isdn_tty.c |   97 +------------------------------------------
 1 file changed, 1 insertion(+), 96 deletions(-)

diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index b41a80a..7bc5067 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -1486,101 +1486,6 @@ isdn_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
  * ------------------------------------------------------------
  */
 
-static int
-isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info *info)
-{
-	struct tty_port *port = &info->port;
-	DECLARE_WAITQUEUE(wait, NULL);
-	int do_clocal = 0;
-	int retval;
-
-	/*
-	 * If the device is in the middle of being closed, then block
-	 * until it's done, and then try again.
-	 */
-	if (tty_hung_up_p(filp) ||
-	    (port->flags & ASYNC_CLOSING)) {
-		if (port->flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&port->close_wait);
-#ifdef MODEM_DO_RESTART
-		if (port->flags & ASYNC_HUP_NOTIFY)
-			return -EAGAIN;
-		else
-			return -ERESTARTSYS;
-#else
-		return -EAGAIN;
-#endif
-	}
-	/*
-	 * If non-blocking mode is set, then make the check up front
-	 * and then exit.
-	 */
-	if ((filp->f_flags & O_NONBLOCK) ||
-	    (tty->flags & (1 << TTY_IO_ERROR))) {
-		port->flags |= ASYNC_NORMAL_ACTIVE;
-		return 0;
-	}
-	if (tty->termios->c_cflag & CLOCAL)
-		do_clocal = 1;
-	/*
-	 * Block waiting for the carrier detect and the line to become
-	 * free (i.e., not in use by the callout).  While we are in
-	 * this loop, info->count is dropped by one, so that
-	 * isdn_tty_close() knows when to free things.  We restore it upon
-	 * exit, either normal or abnormal.
-	 */
-	retval = 0;
-	add_wait_queue(&port->open_wait, &wait);
-#ifdef ISDN_DEBUG_MODEM_OPEN
-	printk(KERN_DEBUG "isdn_tty_block_til_ready before block: ttyi%d, count = %d\n",
-	       info->line, info->count);
-#endif
-	if (!(tty_hung_up_p(filp)))
-		port->count--;
-	port->blocked_open++;
-	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (tty_hung_up_p(filp) ||
-		    !(port->flags & ASYNC_INITIALIZED)) {
-#ifdef MODEM_DO_RESTART
-			if (port->flags & ASYNC_HUP_NOTIFY)
-				retval = -EAGAIN;
-			else
-				retval = -ERESTARTSYS;
-#else
-			retval = -EAGAIN;
-#endif
-			break;
-		}
-		if (!(port->flags & ASYNC_CLOSING) &&
-		    (do_clocal || tty_port_carrier_raised(port))) {
-			break;
-		}
-		if (signal_pending(current)) {
-			retval = -ERESTARTSYS;
-			break;
-		}
-#ifdef ISDN_DEBUG_MODEM_OPEN
-		printk(KERN_DEBUG "isdn_tty_block_til_ready blocking: ttyi%d, count = %d\n",
-		       info->line, port->count);
-#endif
-		schedule();
-	}
-	current->state = TASK_RUNNING;
-	remove_wait_queue(&port->open_wait, &wait);
-	if (!tty_hung_up_p(filp))
-		port->count++;
-	port->blocked_open--;
-#ifdef ISDN_DEBUG_MODEM_OPEN
-	printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
-	       info->line, port->count);
-#endif
-	if (retval)
-		return retval;
-	port->flags |= ASYNC_NORMAL_ACTIVE;
-	return 0;
-}
-
 /*
  * This routine is called whenever a serial port is opened.  It
  * enables interrupts for a serial port, linking in its async structure into
@@ -1616,7 +1521,7 @@ isdn_tty_open(struct tty_struct *tty, struct file *filp)
 #endif
 		return retval;
 	}
-	retval = isdn_tty_block_til_ready(tty, filp, info);
+	retval = tty_port_block_til_ready(port, tty, filp);
 	if (retval) {
 #ifdef ISDN_DEBUG_MODEM_OPEN
 		printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
-- 
1.7.9.2


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