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

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Message-ID: <Pine.LNX.4.64.0806171530340.22840@vixen.sonytel.be>
Date:	Tue, 17 Jun 2008 15:31:30 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	linux-scsi@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [regression] CD-DA delay needed after insertion

On Mon, 16 Jun 2008, James Bottomley wrote:
> On Mon, 2008-06-16 at 17:05 +0200, Geert Uytterhoeven wrote:
> > On Sun, 15 Jun 2008, James Bottomley wrote:
> > > On Fri, 2008-06-13 at 13:57 +0200, 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.
> > > 
> > > There aren't that many commits affecting sr between 2.6.24 and 2.6.25,
> > > so I'd bet on the previous culprits.
> > > 
> > > This time, the taxonomy looks like NOT_READY isn't being waited for
> > > properly.  I'd still tend to blame
> > > 210ba1d1724f5c4ed87a2ab1a21ca861a915f734 it's just that this time I
> > 
> > Reverting that commit doesn't fix the problem.
> 
> That's a bit of a problem.  Particularly as:
> 
> > > suspect this to be the problem line:
> > > 
> > > 	if (sshdr.sense_key == NOT_READY && sshdr.asc == 0x04)
> > > 		return CDS_DISC_OK;
> > > 
> > > Previously the code would have returned CDS_NO_DISC for the not ready
> > > case.  The CD would have tried to close the door but (and this is the
> > > key) it would have waited for the door to close before trying again.
> > 
> > I tried the patch below.
> > 
> > Now the kernel spits out messages every 2 seconds:
> > 
> > | G: CDS_NO_DISC
> > | G: CDS_NO_DISC
> > 
> > Insert CD-DA media
> > 
> > Reading from CD using cdparanioa fails
> > 
> > | F: CDS_DISC_OK
> > | F: CDS_DISC_OK
> > | F: CDS_DISC_OK
> > | F: CDS_DISC_OK
> > | F: CDS_DISC_OK
> 
> That's in the two lines I fingered as the source of the problem ...
> however, if reversing the apparently bad commit (that introduces those
> lines) doesn't work there's something else wrong.
> 
> Could you try altering your F: case to return CDS_DRIVE_NOT_READY, but
> if that doesn't work, it's going to take a bit of bisection, I'm
> afraid ...

Doesn't make any difference.

git-bisect taught me it was introduced by

commit 38582a62ecd337de4212004c7d4844899dc57890
Author: James Bottomley <James.Bottomley@...senPartnership.com>
Date:   Wed Feb 6 13:01:58 2008 -0600

    [SCSI] sr: fix test unit ready responses
    
    Commit 210ba1d1724f5c4ed87a2ab1a21ca861a915f734 updated sr.c to use
    the scsi_test_unit_ready() function.  Unfortunately, this has the
    wrong characteristic of eating NOT_READY returns which sr.c relies on
    for tray status.
    
    Fix by rolling an internal sr_test_unit_ready() that doesn't do this.


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/

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