From 87ece583310d47bcf0027e4a77c990bbb010fc5e Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Thu, 6 Mar 2014 12:02:56 -0700
Subject: [PATCH] staging: comedi: comedi_fops: introduce
 __comedi_get_user_cmd()

The COMEDI_CMD and COMEDI_CMDTEST ioctl functions both copy the
comedi_cmd passed by the user from __user memory space to kernel
memory space. They then do some basic sanity checking of the cmd
before the subdevice (*do_cmdtest) and (*do_cmd) operations are
called.

Introduce a helper function to handle the copy_from_user() and
do the basic sanity checking.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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