From c6cd0eefb27b47a3f67ec0adbea14b4f97d72ec9 Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Thu, 6 Mar 2014 12:02:57 -0700
Subject: [PATCH] staging: comedi: comedi_fops: introduce
 __comedi_get_user_chanlist()

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

Introduce a helper function to handle the memdup_user() and the sanity
checking.

Also, remove the unnecessary dev_dbg() when the memdup_user() or
comedi_check_chanlist() fail.

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>
---
Reading git-format-patch failed