netdev - Re: [PATCH 1/7] uio: add module owner to prevent inappropriate module unloading

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Message-ID: <20130815084221.3339142f@mitra.spranger.biz>
Date:	Thu, 15 Aug 2013 08:42:21 +0200
From:	Benedikt Spranger <b.spranger@...utronix.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	netdev@...r.kernel.org,
	Alexander Frank <Alexander.Frank@...rspaecher.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Holger Dengler <dengler@...utronix.de>
Subject: Re: [PATCH 1/7] uio: add module owner to prevent inappropriate
 module unloading

On Wed, 14 Aug 2013 09:33:11 -0700
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> Step 4 should have told UIO that it was gone and had it shut everything
> down properly, so that there would not be a crash.
The MFD driver only knows about a specific MFD cell. Through
enable/disable callbacks the driver could tell UIO ...hm... whom? what?

Neither the MFD driver nor the MFD core knows something about a specific
UIO driver. But only that specific UIO driver knows about the device
node activities. 

> > > You shouldn't need a module reference for this type of thing.
> > The driver uio_pdrv has no chance to recognize that the underlaying platform
> > device has gone.
> The mfd driver could tell it that it is gone, right?
It could tell, but whom and how?

Regards
    Benedikt Spranger
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