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

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Message-ID: <520D07D6.70407@linutronix.de>
Date:	Thu, 15 Aug 2013 18:54:46 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Benedikt Spranger <b.spranger@...utronix.de>,
	netdev@...r.kernel.org,
	Alexander Frank <Alexander.Frank@...rspaecher.com>,
	"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 08/15/2013 06:42 PM, Greg Kroah-Hartman wrote:
>> For this to happen you would need a refcount in uio-core which learns
>> that the device is gone and does not invoke any callbacks because the
>> device is gone. Something like you have in USB where you return 0 on
>> reads from ttyUSB after someone pulled the cable.
> 
> That happens because we invalidate the filehandle in the tty layer by
> tearing everything down in the usb serial driver.  And yes, uio also
> needs to do the same thing, if it doesn't already.

Ah. Do you have a handy pointer where / how you do this?

> 
> thanks,
> 
> greg k-h

Sebastian
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