From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752775AbcG2JXt (ORCPT ); Fri, 29 Jul 2016 05:23:49 -0400 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:60792 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751607AbcG2JXs (ORCPT ); Fri, 29 Jul 2016 05:23:48 -0400 Date: Fri, 29 Jul 2016 10:23:35 +0100 From: One Thousand Gnomes To: ebiederm@xmission.com (Eric W. Biederman) Cc: Max Staudt , "Theodore Ts'o" , Greg KH , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Message-ID: <20160729102335.2dbe3cad@lxorguk.ukuu.org.uk> In-Reply-To: <87mvl1hahu.fsf@x220.int.ebiederm.org> References: <1469468175-15704-1-git-send-email-mstaudt@suse.de> <20160725174712.GA5752@kroah.com> <20160726150856.GA15676@kroah.com> <20160727130923.4c20524b@lxorguk.ukuu.org.uk> <2b140616-c210-e754-a854-cd6a5675277d@suse.de> <20160727133348.GB20032@thunk.org> <87mvl1hahu.fsf@x220.int.ebiederm.org> Organization: Intel Corporation X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.30; x86_64-redhat-linux-gnu) 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 > Serial consoles are already polled for output. So nothing should > care until userspace starts, and the full serial driver initializes. At which point it hangs > So I suspect either "irqfixup" or "irqpoll" would handle this for you. > If not I am certain a small tweak to some of that code would work. irqfixup won't usually help but irqpoll with HZ=1000 ought to, although it has its own set of problems because not all devices with non shared IRQ lines take kindly to irqpoll. Alan