linux-kernel - Re: Re: pktcdvd oops

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Message-ID: <Pine.LNX.4.64.0711081845480.5401@quad.localdomain>
Date:	Thu, 8 Nov 2007 18:49:48 +0100 (CET)
From:	Peter Osterlund <petero2@...ia.com>
To:	Thomas Maier <balagi@...tmail.de>
cc:	Tejun Heo <htejun@...il.com>, Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>, gregkh@...e.de
Subject: Re: Re: pktcdvd oops

On Thu, 8 Nov 2007, balagi@...tmail.de wrote:

> tested it too, running linux 2.6.23 in a qemu instance, and the patch 
> worked. But i would prefer to take the try_module_get() stuff into 
> pkt_setup_dev() because it is used also in the older procfs interface. 
> Can we run into the same problem here, means procfs holds no module 
> references too, like sysfs now?

The procfs interface can only be used to get some debug data out from the 
driver, not to bind the driver to a CD/DVD device, so it shouldn't be a 
problem.

The other way to bind a device is to use the pktsetup program, which is 
doing ioctl calls to the driver. In that case, user space has to open the 
device before being able to do the ioctls, and the open call will increase 
the reference count.

-- 
Peter Osterlund - petero2@...ia.com
http://web.telia.com/~u89404340
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