Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753502Ab2KWSnF (ORCPT ); Fri, 23 Nov 2012 13:43:05 -0500 Received: from 95-31-19-74.broadband.corbina.ru ([95.31.19.74]:45565 "EHLO 95-31-19-74.broadband.corbina.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752291Ab2KWSnE (ORCPT ); Fri, 23 Nov 2012 13:43:04 -0500 Message-ID: <50AFC3A6.7010308@ilyx.ru> Date: Fri, 23 Nov 2012 22:42:46 +0400 From: Ilya Zykov User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:16.0) Gecko/20121026 Thunderbird/16.0.2 MIME-Version: 1.0 To: Alan Cox CC: Greg Kroah-Hartman , Andrew McGregor , linux-kernel@vger.kernel.org, ilya@ilyx.ru Subject: [PATCH]tty: Incorrect use tty_ldisc_flush() in TTY drivers. Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1761 Lines: 46 This patch correct tty serial drivers. Unfortunately, many drivers indirectly call ldisc's flush_buffer() function in own callback function close(). Рarticularly, by the use of tty_ldisc_flush(), before TTY LAYER calls ldisc's flush_buffer() in the right moment. 1. It disturb the logic of work ldisc's layer. 2. It is simple overhead because we call ldisc's flush_buffer() at least two times. Signed-off-by: Ilya Zykov --- diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index a21dc8e..c4a0a6d 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1288,7 +1288,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp) uart_shutdown(tty, state); uart_flush_buffer(tty); - tty_ldisc_flush(tty); + tty_buffer_flush(tty); tty_port_tty_set(port, NULL); spin_lock_irqsave(&port->lock, flags); diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index bf6e238..c23dd30 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -364,8 +364,8 @@ int tty_port_close_start(struct tty_port *port, timeout = 2 * HZ; schedule_timeout_interruptible(timeout); } - /* Flush the ldisc buffering */ - tty_ldisc_flush(tty); + /* Flush the driver buffering */ + tty_buffer_flush(tty); /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to hang up the line */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/