linux-kernel - Re: mcdx -- do_request(): non-read command to cd!!

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Date:	Mon, 2 Apr 2007 08:42:45 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Al Viro <viro@....linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: mcdx -- do_request(): non-read command to cd!!

On Mon, Apr 02 2007, Rene Herman wrote:
> On 04/01/2007 12:06 PM, Pekka Enberg wrote:
> 
> >Looks like mcdx_xfer is sleeping while holding q->queue_lock. The 
> >attached (untested) patch should fix it.
> 
> This (including your followup) does indeed avoid the traces in the 
> kernel log, but unfortunately, the driver seems to need a bit more.

I took a quick look at the driver, and it's pretty much utter crap so I
would not expect much. If you want to use it, make sure you at least
disable any form of SMP and preempt.

> Last time Al Viro suggested ripping them out, I slightly objected:
> 
> http://lkml.org/lkml/2004/5/2/123
> 
> but well, although I like playing with this stuff, I still don't know 
> the first thing about the block layer and given the shape these things 
> are in...

The questionable quality of the ancient CDROM drivers itself makes it
appealing to just dump it.

-- 
Jens Axboe

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