linux-kernel - Re: [BUG] Linux-2.6.31-rc1-git9 Cannot Recognize Empty DVD Media

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Date:	Thu, 9 Jul 2009 10:12:05 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	James.Bottomley@...senPartnership.com, dwalker@...o99.com,
	maciej.rutecki@...il.com, akpm@...ux-foundation.org,
	tarkan.erimer@...knet.net.tr, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [BUG] Linux-2.6.31-rc1-git9 Cannot Recognize Empty DVD Media

On Thu, Jul 09 2009, FUJITA Tomonori wrote:
> On Thu, 9 Jul 2009 09:50:04 +0200
> Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > On Thu, Jul 09 2009, FUJITA Tomonori wrote:
> > > From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > > Subject: [PATCH] block: call blk_scsi_ioctl_init()
> > > 
> > > Currently, blk_scsi_ioctl_init() is not called so
> > > blk_default_cmd_filter isn't initalized. Some commands are not blocked
> > > wrongly.
> > > 
> > > This fixes a regression introduced:
> > > 
> > > commit 018e0446890661504783f92388ecce7138c1566d
> > > Author: Jens Axboe <jens.axboe@...cle.com>
> > > Date:   Fri Jun 26 16:27:10 2009 +0200
> > > 
> > >     block: get rid of queue-private command filter
> > > 
> > > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > > ---
> > >  block/scsi_ioctl.c |    1 +
> > >  1 files changed, 1 insertions(+), 0 deletions(-)
> > > 
> > > diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
> > > index f0e0ce0..e5b1001 100644
> > > --- a/block/scsi_ioctl.c
> > > +++ b/block/scsi_ioctl.c
> > > @@ -680,3 +680,4 @@ int __init blk_scsi_ioctl_init(void)
> > >  	blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
> > >  	return 0;
> > >  }
> > > +fs_initcall(blk_scsi_ioctl_init);
> > > -- 
> > > 1.6.0.6
> > 
> > You beat me to it, it was the missing call as I suspected. This
> > works, I verified it myself. Applied to for-linus, going upstream
> > soon.
> 
> I really hope that you become more serious about not causing such
> incident; breaking mainline kernel by merging your trivial patch after
> -rc1 (even without sending the patch to any mailing list). You broke
> mainline in the exact same way just months ago (the commit
> 1e42807918d17e8c93bf14fbb74be84b141334c1 in 2.6.29-rc7).

It should have waited for .32, I agree. I had it sitting around
for quite a while, not sure why the merged version didn't have
the initcall added. But yes, I should have posted and postponed
it.

-- 
Jens Axboe

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