From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757411Ab0FAUxh (ORCPT ); Tue, 1 Jun 2010 16:53:37 -0400 Received: from moutng.kundenserver.de ([212.227.17.8]:59687 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757361Ab0FAUxb (ORCPT ); Tue, 1 Jun 2010 16:53:31 -0400 From: Arnd Bergmann To: Greg KH Cc: linux-kernel@vger.kernel.org, Arnd Bergmann , Alan Cox , Frederic Weisbecker , John Kacur , Alan Cox Subject: [PATCH 20/31] serial: Use block_til_ready helper Date: Tue, 1 Jun 2010 22:53:00 +0200 Message-Id: <1275425591-8803-21-git-send-email-arnd@arndb.de> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1275425591-8803-1-git-send-email-arnd@arndb.de> References: <1275425591-8803-1-git-send-email-arnd@arndb.de> X-Provags-ID: V01U2FsdGVkX19HC/qTgznw982kcdMmqeM/Ry3N22PYHmT28Un 7ESfdiui8eWpPYd0GUKKKZFg+dxm6DyqVoyxOcSTlgscNFNEqt XnpbCaSzjnisYPI0ID3ag== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Cox Our code now rather closely resembles the helper, so switch to it. Signed-off-by: Alan Cox --- drivers/serial/serial_core.c | 87 +----------------------------------------- 1 files changed, 1 insertions(+), 86 deletions(-) diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 0603e0d..a55751a 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -1526,91 +1526,6 @@ static void uart_dtr_rts(struct tty_port *port, int onoff) uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); } -/* - * Block the open until the port is ready. We must be called with - * the per-port semaphore held. - */ -static int -uart_block_til_ready(struct file *filp, struct uart_state *state) -{ - DECLARE_WAITQUEUE(wait, current); - struct tty_port *port = &state->port; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - if (!tty_hung_up_p(filp)) - port->count--; - port->blocked_open++; - spin_unlock_irqrestore(&port->lock, flags); - - add_wait_queue(&port->open_wait, &wait); - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - - /* - * If we have been hung up, tell userspace/restart open. - */ - if (tty_hung_up_p(filp) || port->tty == NULL) - break; - - /* - * If the port has been closed, tell userspace/restart open. - */ - if (!(port->flags & ASYNC_INITIALIZED)) - break; - - /* - * If non-blocking mode is set, or CLOCAL mode is set, - * we don't want to wait for the modem status lines to - * indicate that the port is ready. - * - * Also, if the port is not enabled/configured, we want - * to allow the open to succeed here. Note that we will - * have set TTY_IO_ERROR for a non-existant port. - */ - if ((filp->f_flags & O_NONBLOCK) || - (port->tty->termios->c_cflag & CLOCAL) || - (port->tty->flags & (1 << TTY_IO_ERROR))) - break; - - /* - * Set DTR to allow modem to know we're waiting. Do - * not set RTS here - we want to make sure we catch - * the data from the modem. - */ - if (port->tty->termios->c_cflag & CBAUD) - tty_port_raise_dtr_rts(port); - - /* - * and wait for the carrier to indicate that the - * modem is ready for us. - */ - if (tty_port_carrier_raised(port)) - break; - - schedule(); - - if (signal_pending(current)) - break; - } - 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--; - spin_unlock_irqrestore(&port->lock, flags); - - if (signal_pending(current)) - return -ERESTARTSYS; - - if (!port->tty || tty_hung_up_p(filp)) - return -EAGAIN; - - return 0; -} - static struct uart_state *uart_get(struct uart_driver *drv, int line) { struct uart_state *state; @@ -1719,7 +1634,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp) */ mutex_unlock(&port->mutex); if (retval == 0) - retval = uart_block_til_ready(filp, state); + retval = tty_port_block_til_ready(port, tty, filp); /* * If this is the first open to succeed, adjust things to suit. -- 1.7.0.4