linux-kernel - Re: [RFC] Input: Remove unsafe device module references

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Message-ID: <20111101181820.GC15216@core.coreip.homeip.net>
Date:	Tue, 1 Nov 2011 11:18:21 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	David Herrmann <dh.herrmann@...glemail.com>
Cc:	Greg KH <gregkh@...e.de>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Input: Remove unsafe device module references

On Tue, Nov 01, 2011 at 07:09:27PM +0100, David Herrmann wrote:
> On Tue, Nov 1, 2011 at 7:00 PM, Greg KH <gregkh@...e.de> wrote:
> > On Tue, Nov 01, 2011 at 06:52:11PM +0100, David Herrmann wrote:
> >> My solution: Some parent subsystem of us must take and release this
> >> module-refcnt instead of us, so this bug doesn't occur.
> >
> > Yes, that is the ultimate solution for something like this.
> >
> > But, in reality, we don't care about module unloading races as there are
> > plenty of other issues involved there where things can go bad, so we
> > just try the best we can :)
> 
> Ah, I am kind of relieved that I got this right. I almost started
> thinking I am insane.. ;)
> 
> So your answer is that this is so unlikely that it won't be fixed? I
> am fine with that, even though I wonder why stuff like "struct
> file_operations" include "owner" fields to protect callbacks but
> "struct device_type" does *not* include any protection of it's
> "release" callback.

I think adding owner to device_type might not be a bad idea at all...

Thanks.

-- 
Dmitry
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