From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Subject: Re: [BUG]: 2.6.19.2: Weird serial core issue Date: Thu, 1 Feb 2007 12:02:08 +0000 Message-ID: <20070201120208.36ccb530@localhost.localdomain> References: <6d6a94c50701310249o2b2c8024i4d3f28ec1601246a@mail.gmail.com> <20070131162123.67e22e23@localhost.localdomain> <6d6a94c50701311833m5952c6fdn8e1f0db28d674e79@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:46886 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1422825AbXBALto (ORCPT ); Thu, 1 Feb 2007 06:49:44 -0500 In-Reply-To: <6d6a94c50701311833m5952c6fdn8e1f0db28d674e79@mail.gmail.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Aubrey Li Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org > I implemented the serial driver by myself, :). See the attachment. > I didn't save/restore terminal setting in the my_set_termios(). Driver looks fine. > I trace this back till tty_tioctl(..., unsigned long arg), everytime I > type "ENTER" key, > the argument "arg" passed into tty_ioctl() is the address of a termios > structure, which include wrong c_cflag. It seems once the flag is > assigned by uart_set_options the first time, it's never changed. So > even userspace application changed the flag, it will be set back soon. > I'll dig into it. But I still think it's a bug. Which application (see from current->pid) seems to be calling the tty_ioctl with the "wrong flag" ?