From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 29 Jan 2013 16:20:17 +0000 (+0000)
Subject: staging: comedi: simplify comedi_set_hw_dev()
X-Git-Tag: v3.9-rc1~127^2~238
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc3954b8147402e4495378d982cc8e708703a0f1;p=pandora-kernel.git

staging: comedi: simplify comedi_set_hw_dev()

Since `get_device()` and `put_device()` can take a NULL device
parameter, `comedi_set_hw_dev()` can be simplified to always call
`get_device()` for the new, possibly NULL hardware device, and
`put_device()` for the old, possibly NULL hardware device.  As long as
we do it in that order, there shouldn't be any problem with
`kref_release()` getting called unexpectedly when the new hardware
device is the old hardware device.

Simplify `comedi_set_hw_dev()` and update the comment because the
function is used for additional purposes since the old comment was
written.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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