linux-kernel - Re: [PATCH 1/4] UIO: hold a reference to the device's owner while the device is open

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Message-ID: <20080410201103.GB16292@digi.com>
Date:	Thu, 10 Apr 2008 22:11:03 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	"Hans J. Koch" <hjk@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] UIO: hold a reference to the device's owner while the device is open

Uwe Kleine-König wrote:
> Otherwise the device might just disappear while /dev/uioX is being used
> which results in an Oops.
To help your understanding, without this patch I can trigger the Oops
by starting an app that does

	opening and mmapping /dev/uio0
	while(1);

and then in another shell do 

	rmmod uio_pdrv

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
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