linux-kernel - Re: 2.6.22-rc2-mm1

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Message-Id: <1180425405.7208.15.camel@lov.localdomain>
Date:	Tue, 29 May 2007 09:56:45 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Tilman Schmidt <tilman@...p.cc>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: 2.6.22-rc2-mm1

On Mon, 2007-05-28 at 19:22 +0200, Cornelia Huck wrote: 
> On Mon, 28 May 2007 00:41:19 +0200,
> "Kay Sievers" <kay.sievers@...y.org> wrote:
> 
> > Cornelia,
> > in the patch is:
> >   +	if (dev->kobj.parent == &dev->class->subsys.kobj)
> >   +		return 0;
> > 
> > which will skip the creation of the "device"-link, right?
> 
> Uh, looking at the code again, this doesn't seem to be what I wanted :(
> 
> > But still, I don't think the transaction-style of error handling is
> > what we want, it's for some critical subsystems the equivalent of
> > adding PANIC(), and this just for a failing symlink-creation. I think
> > we just want to print the to the logs, and not let the whole core
> > device registration fail entirely.
> 
> Hm, but failure to create a symlink usually signifies something's really
> wrong (no memory, or an object is there which shouldn't)?

Sure, but this is core code, which is used by _all_ drivers and _all_
devices. Subsystems can decide to panic if this appropriate, but generic
core code should probably not make such decisions.

With this change, a single failing symlink (or attribute) for a
scsi/ide/block/... device may crash the whole box during bootup. I'm not
sure that this is what we want.

It's a failure that should be logged (the patch doesn't even add that),
but there is probably no reason to refuse the creation of a device, if
something non-vital like a symlink or attribute fails to be created.

Thanks,
Kay

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