Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751306AbXBZQAt (ORCPT ); Mon, 26 Feb 2007 11:00:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751307AbXBZQAt (ORCPT ); Mon, 26 Feb 2007 11:00:49 -0500 Received: from smtp.osdl.org ([65.172.181.24]:50501 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751306AbXBZQAs (ORCPT ); Mon, 26 Feb 2007 11:00:48 -0500 Date: Mon, 26 Feb 2007 07:51:19 -0800 (PST) From: Linus Torvalds To: Jiri Slaby cc: Uwe Bugla , akpm@linux-foundation.org, bunk@stusta.de, linux-kernel@vger.kernel.org, Stephane Eranian , Andi Kleen Subject: Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot be mounted without hanging up the whole system In-Reply-To: <45E2F8C5.3080905@gmail.com> Message-ID: References: <20070224175424.176030@gmx.net> <45E2B88B.1090706@gmail.com> <45E2F8C5.3080905@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1161 Lines: 32 On Mon, 26 Feb 2007, Jiri Slaby wrote: > > Ok, this commit is the culprit: > Commit: 2ff2d3d74705d34ab71b21f54634fcf50d57bdd5 > Author: Stephane Eranian Tue, 13 Feb 2007 13:26:22 +0100 > > [PATCH] i386: add idle notifier Interesting. It doesn't touch floppy at all, but it *does* seem to play around with irq state. In particular, the floppy uses IRQF_DISABLED (which means that it doesn't want interrupts enabled when in the irq handler), and I get the feeling that the poll_idle() stuff made that not work. That said, the only thing that *really* seems to change (as far as a floopy driver could notice) is the added "exit_idle()" in the do_IRQ() sequence, and I'm not seeing that one enabling interrupts. But the idle sequence definitely does (ie now we disable/enable interrupts in cpu_idle(). I'm not seeing why that should matter, though. Stephane, any ideas? Linus - 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/