Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751395AbVIUT3m (ORCPT ); Wed, 21 Sep 2005 15:29:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751399AbVIUT3l (ORCPT ); Wed, 21 Sep 2005 15:29:41 -0400 Received: from caramon.arm.linux.org.uk ([212.18.232.186]:22793 "EHLO caramon.arm.linux.org.uk") by vger.kernel.org with ESMTP id S1751395AbVIUT3l (ORCPT ); Wed, 21 Sep 2005 15:29:41 -0400 Date: Wed, 21 Sep 2005 20:29:32 +0100 From: Russell King To: Alan Cox Cc: Mark Lord , Richard Purdie , LKML , Dominik Brodowski , bzolnier@gmail.com, linux-ide@vger.kernel.org Subject: Re: [RFC/BUG?] ide_cs's removable status Message-ID: <20050921192932.GB13246@flint.arm.linux.org.uk> Mail-Followup-To: Alan Cox , Mark Lord , Richard Purdie , LKML , Dominik Brodowski , bzolnier@gmail.com, linux-ide@vger.kernel.org References: <1127319328.8542.57.camel@localhost.localdomain> <1127321829.18840.18.camel@localhost.localdomain> <433196B6.8000607@rtr.ca> <1127327243.18840.34.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1127327243.18840.34.camel@localhost.localdomain> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1965 Lines: 42 On Wed, Sep 21, 2005 at 07:27:23PM +0100, Alan Cox wrote: > On Mer, 2005-09-21 at 13:21 -0400, Mark Lord wrote: > > In the case of CF cards in ide-cs, removing the card is equivalent > > to removing the entire IDE controller, not just the media. > > It isn't the same as removing the entire PCMCIA controller layer. As far > as PCMCIA is concerned there has been no change. Thus we have no media > change event and we need ->removable = 1 > > If the PCMCIA card disappeared each time it would be different Last time I checked, with CF cards the media was an inherent part of the CF card and is not changable without removing the card, opening it, getting out the soldering iron... or alternatively plugging in a different CF card. Of course, PCMCIA will detect removal of the CF card provided the PCMCIA hardware is working. PCMCIA will also detect a CF card which has been changed while the system has been suspended _provided_ the CIS does not match the previous cards CIS. It'll even do this if you use cardctl suspend/cardctl resume. However, if you suspend your system, remove your CF card, put it in a different machine, use it (note: by doing this it could _already_ be in an inconsistent state), and put it back in the original machine before resuming it, the cache on the original machine will disagree with what is on the card. But then you have done something silly already by taking media in an inconsistent state to another machine - and modified that inconsistent filesystem state. It sounds like you know of a case where this isn't true - maybe a bug report. Can you expand on it? -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - 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/