From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Wed, 4 Mar 2015 10:11:05 -0800
Subject: locking a device for exclusive use by userspace process (or
	kernel thread)
In-Reply-To: <1425491944.3069.29.camel@opteya.com>
References: <1425491944.3069.29.camel@opteya.com>
Message-ID: <20150304181105.GA13218@kroah.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Wed, Mar 04, 2015 at 06:59:04PM +0100, Yann Droneaud wrote:
> Hi,
> 
> I have a device and I have to write a driver that exposes the
> following three operations to kernel modules AND to userspace
> programs:

<snip>

Why?  What type of device is this?  And who is asking you to do this
homework assignment?

good luck,

greg k-h