linux-kernel - Re: [regression] CD-DA delay needed after insertion

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Date:	Sun, 15 Jun 2008 09:33:56 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	linux-scsi@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [regression] CD-DA delay needed after insertion

On Sun, 2008-06-15 at 15:46 +0300, Boaz Harrosh wrote:
> Geert Uytterhoeven wrote:
> > We've found another regression in 2.6.25 w.r.t. CD media change on PS3.
> > 
> > It can easily be reproduced by:
> > 
> >   1. Inserting an audio CD
> >   2. Running the following command as soon as the blue CD/DVD/BD drive LED
> >      stops blinking and is lit continuously:
> >       
> > 	 cdparanoia -Z -q 1-1[:1] /dev/null || echo failed
> > 
> > On 2.6.25 (and current mainline), you have to wait ca. 10 seconds after
> > insertion, or it will fail.
> > On 2.6.24 and older, it just works immediately.
> > 
> > It does not matter whether
> > http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fjejb%2Fscsi-rc-fixes-2.6.git;a=commitdiff_plain;h=d1daeabf0da5bfa1943272ce508e2ba785730bf0
> > is applied or not.
> > 
> > We haven't bisected it yet.
> > 
> > With kind regards,
> > 
> > Geert Uytterhoeven
> > Software Architect
> > 
> > Sony Techsoft Centre
> > The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
> > 
> > Phone:    +32 (0)2 700 8453
> > Fax:      +32 (0)2 700 8622
> > E-mail:   Geert.Uytterhoeven@...ycom.com
> > Internet: http://www.sony-europe.com/
> > 
> > Sony Technology and Software Centre Europe
> > A division of Sony Service Centre (Europe) N.V.
> > Registered office: Technologielaan 7 · B-1840 Londerzeel · Belgium
> > VAT BE 0413.825.160 · RPR Brussels
> > Fortis 293-0376800-10 GEBA-BE-BB
> 
> James hi.
> 
> It looks like the same problem as before. Any BLOCK_PC command will 
> eat the UNIT_ATTENTION notification. Which is what I was afraid of. 
> I was thinking of something like below.

It's a bit unlikely to be the cause of a regression, since the code has
behaved this way by design since at least 2.4.  The problem we're
looking for appeared in 2.6.25+

Also, the taxonomy of the regression: errors returned within 10s of
inserting the CD sounds very much like an ignored NOT_READY.

> Totally untested, never even booted. It is just to demonstrate the concept.
> Please tell me if it is at all desirable and I'll spend some time to see
> if it runs, and test it.

Really, no ... not until there's a proveable problem caused by it.  Even
then, not like this: the way you've coded it interferes with the cc_ua
processing code.  It would have to go in scsi_decide_disposition().

James


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