Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932994AbXAaKt2 (ORCPT ); Wed, 31 Jan 2007 05:49:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933005AbXAaKt1 (ORCPT ); Wed, 31 Jan 2007 05:49:27 -0500 Received: from wx-out-0506.google.com ([66.249.82.232]:21960 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932998AbXAaKt0 (ORCPT ); Wed, 31 Jan 2007 05:49:26 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=Y+6cXssd+7aA8oRLVvG9VOzK8IUC4XDR3hFbnUKFZaAWx3xdgGar17hEaNRQtz5WpJX1KhMmHKjmBjPNq6zpE5/+IJ2JsbCzgtJNRiqjWISYaXQhsJvRvub86a6iNzBn79rAlNPW22Po0Mp3MAuRmzsHIsOv4lKXtoVYAQni0jE= Message-ID: <6d6a94c50701310249o2b2c8024i4d3f28ec1601246a@mail.gmail.com> Date: Wed, 31 Jan 2007 18:49:25 +0800 From: "Aubrey Li" To: linux-kernel@vger.kernel.org Subject: [BUG]: 2.6.19.2: Weird serial core issue Cc: linux-serial@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1151 Lines: 35 I insert one printk into drivers/serial/serial_core.c: uart_set_termios() to describe the issue. static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios) { ----snip---- unsigned int cflag = tty->termios->c_cflag; BUG_ON(!kernel_locked()); +++printk("new_termios flag: 0x%x, old_termios flag: 0x%x\n"); +++ cflag, old_termios->c_cflag); ----snip ---- } When I telnet my board and run the following command: ---- root:~> stty -F /dev/ttyS0 -crtscts I got the following result from the console of my board: ---- root:~>new_termios flag: 0x1cb1, old_termios flag: 0x80001cb1 That's correct. CRTSCTS flag is clear But when I type "ENTER" key on the console, I got: ----root:~>new_termios flag: 0x80001cb1, old_termios flag: 0x1cb1 The CRTSCTS flag is set back. But I didn't set it back, I just type "ENTER". I guess, Is it a serial core bug? -Aubrey - 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/