From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Thu, 6 Mar 2014 19:02:56 +0000 (-0700)
Subject: staging: comedi: comedi_fops: introduce __comedi_get_user_cmd()
X-Git-Tag: v3.15-rc1~139^2~322
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87ece583310d47bcf0027e4a77c990bbb010fc5e;p=pandora-kernel.git

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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