From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Thu, 6 Mar 2014 19:02:57 +0000 (-0700)
Subject: staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()
X-Git-Tag: v3.15-rc1~139^2~321
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6cd0eefb27b;p=pandora-kernel.git

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>
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