linux-kernel - Re: [REGRESSION 2.6.27-rc4-git7] mtd broken by cmdfilter move

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Message-ID: <18617.35916.80075.481108@harpo.it.uu.se>
Date:	Sat, 30 Aug 2008 20:07:08 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Greg KH <gregkh@...e.de>
Cc:	Mikael Pettersson <mikpe@...uu.se>, fujita.tomonori@....ntt.co.jp,
	dwmw2@...radead.org, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION 2.6.27-rc4-git7] mtd broken by cmdfilter move

Greg KH writes:
 > > --- linux-2.6.27-rc4-git6/block/cmd-filter.c.~1~	2008-08-30 17:08:58.000000000 +0200
 > > +++ linux-2.6.27-rc4-git6/block/cmd-filter.c	2008-08-30 17:36:36.000000000 +0200
 > > @@ -215,6 +215,13 @@ int blk_register_filter(struct gendisk *
 > >  	if (!parent)
 > >  		return -ENODEV;
 > >  
 > > +	printk("%s: disk %p queue %p filter %p &filter->kobj %p\n",
 > > +	       __func__, disk, disk->queue, filter, &filter->kobj);
 > > +	if (filter->kobj.state_initialized) {
 > > +		printk("%s: kobj %p already inited, bailing out\n",
 > > +		       __func__, &filter->kobj);
 > > +		return 0;
 > > +	}
 > 
 > Ick, no, don't go poking into the internals of a kobject like this to
 > fix this kind of problem.  If you really don't know if you have
 > initialized this kobject or not, then you will have reference counting
 > problems, which need to be fixed for real.

This was a debug patch, I wasn't suggesting it as "the" fix.
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