From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [Lsf-pc] [LSF/MM TOPIC] Integrated Unit Attention handling Date: Wed, 17 Dec 2014 12:54:06 +0100 Message-ID: <54916EDE.3000004@acm.org> References: <548EFB97.2080501@suse.de> <20141216083245.GA29219@infradead.org> <5490501A.2020706@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from albert.telenet-ops.be ([195.130.137.90]:50907 "EHLO albert.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750999AbaLQLyQ (ORCPT ); Wed, 17 Dec 2014 06:54:16 -0500 In-Reply-To: <5490501A.2020706@suse.de> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Hannes Reinecke , Christoph Hellwig Cc: "lsf-pc@lists.linux-foundation.org" , "linux-scsi@vger.kernel.org" On 12/16/14 16:30, Hannes Reinecke wrote: > On 12/16/2014 09:32 AM, Christoph Hellwig wrote: >> Sounds like a good topic, altough I hope we'll see considerable >> progress before LSF on this item.. > > Full integration requires a change of the SCSI device model; > currently struct scsi_device has a fixed type and inquiry data, so > rescan is essentially a no-op. > So the current model requires the complete removal of the device and > a rescan on the host. > Doing that from within the SCSI stack will open quite some > interesting race conditions, let alone interesting userspace > interactions. > Alternatively we can change the model to allow for a change of the > inquiry data, but that should be discussed. > > And then there is the Power-On/Reset handling, which probably would > warrant a discussion on its own ... Hello Hannes and Christoph, If any of the topics raised by Hannes have not been resolved before the LSF/MM starts I'm definitely interested in attending this discussion. Bart.