From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754440Ab1LWUkv (ORCPT ); Fri, 23 Dec 2011 15:40:51 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:51004 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753136Ab1LWUks (ORCPT ); Fri, 23 Dec 2011 15:40:48 -0500 Date: Fri, 23 Dec 2011 20:40:15 +0000 From: Alan Cox To: markh@compro.net Cc: Linux-kernel , Mark Hounschell Subject: Re: tty TTY_HUPPED anomaly Message-ID: <20111223204015.541924f2@pyx> In-Reply-To: <4EF4CC92.5090502@compro.net> References: <4EF49579.9040907@compro.net> <4EF4CC92.5090502@compro.net> X-Mailer: Claws Mail 3.7.10 (GTK+ 2.24.8; i386-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > I turned the TTY_DEBUG_HANGUP and added some additional printks. You see > below the first port works just fine but the second fails because > something is calling the tty_hangup function around 70usecs after I open > the device??? > What and Why??? The driver will be - and because the carrier dropped and the HUPCL flag is set on the port. Alan