From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: 2.6.25.3: serial problem (minicom) Date: Thu, 15 May 2008 20:23:00 -0700 Message-ID: <20080515202300.4d0465ac.akpm@linux-foundation.org> References: <7723.10156.qm@web52901.mail.re2.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:60407 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753187AbYEPDXc (ORCPT ); Thu, 15 May 2008 23:23:32 -0400 In-Reply-To: <7723.10156.qm@web52901.mail.re2.yahoo.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Chris Rankin Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org On Thu, 15 May 2008 20:06:23 +0100 (BST) Chris Rankin wrote: > I have two Linux boxes connected by a null-modem cable between their serial ports; one box exports > a serial console, which the other reads using the minicom program. However, I have noticed that > minicom can no longer use the serial console when it is running on a 2.6.25.3 kernel, although it > works fine running on a 2.6.24.4 kernel. > > Specifically, with minicom running on 2.6.25.3, the console does not accept keystrokes although it > does receive the boot log from the remote machine. > > The serial console is being exported by a 2.6.25.3 kernel, and appears to be working correctly. We did make some changes to serial_core.c in that timeframe which might have caused this, such as: Author: Russell King 2008-02-04 22:27:52 Committer: Linus Torvalds 2008-02-05 09:44:10 Parent: 9d778a69370cc1b643b13648df971c83ff5654ef (serial: avoid waking up closed serial ports on resume) Child: 6d4d67beb963de8865499781b8523e5b683819c3 (serial: speed setup failure reporting) Branches: many (89) Follows: v2.6.24 Precedes: v2.6.25-rc1 serial: avoid stalling suspend if serial port won't drain Author: Yinghai Lu 2008-02-04 22:27:46 Committer: Linus Torvalds 2008-02-05 09:44:09 Parent: 149b36eae2ab6aa6056664f4bc461f3d3affc9c1 (serial: stop passing NULL to functions that expect data) Child: 9d778a69370cc1b643b13648df971c83ff5654ef (serial: avoid waking up closed serial ports on resume) Branches: many (89) Follows: v2.6.24 Precedes: v2.6.25-rc1 serial: keep the DTR setting for serial console. But I don't recall seeing any other reports of this and there's not really anyone who is actively working on the serial drivers. All of which builds up to the dreaded.... would you be able to perform a bisection search to work out which commit caused this? http://www.kernel.org/doc/local/git-quick.html has instructions. Thanks.