From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [Lsf-pc] [LSF/MM TOPIC] Integrated Unit Attention handling Date: Tue, 16 Dec 2014 16:30:34 +0100 Message-ID: <5490501A.2020706@suse.de> References: <548EFB97.2080501@suse.de> <20141216083245.GA29219@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from cantor2.suse.de ([195.135.220.15]:55019 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750976AbaLPPai (ORCPT ); Tue, 16 Dec 2014 10:30:38 -0500 In-Reply-To: <20141216083245.GA29219@infradead.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Christoph Hellwig Cc: "lsf-pc@lists.linux-foundation.org" , "linux-scsi@vger.kernel.org" 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.. >=20 =46ull 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 ... Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: F. Imend=F6rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N=FCrnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html