Subject: Re: ide-scsi oops was: 2.6.0-test4-mm3
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jens Axboe <axboe@suse.de>
Cc: "Martin J. Bligh" <mbligh@aracnet.com>, Andrew Morton <akpm@osdl.org>,
       Mike Fedyk <mfedyk@matchmail.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-mm@kvack.org
In-Reply-To: <20030911082057.GP1396@suse.de>
References: <20030910114346.025fdb59.akpm@osdl.org>
	 <10720000.1063224243@flay>  <20030911082057.GP1396@suse.de>
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Date: Thu, 11 Sep 2003 16:27:29 +0100
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On Iau, 2003-09-11 at 09:20, Jens Axboe wrote:
> > need it. Is it unfixable? or just nobody's done it?
> 
> It's not unfixable, there's just not a lot of motivation to fix it since
> it's basically dead.

Almost all IDE tape drives require ide-scsi/st modules for one.  I'm not
sure of the problems in the 2.5 case, in the 2.4 case the big one was
that both IDE and SCSI want to control reset/recovery and reissue of
commands. That turns into a nasty mess and 2.4 now lets the IDE layer do
it, with SCSI just backing off. That may well be the right model for
2.5.x - ie the reset eh handler just waits for the IDE layer to kill the
command. The other one was races in the reset code which 2.4 I think now
has fixed, which will bite non scsi users but less often

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