From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 8 Jan 2013 13:27:48 +0000 (+0000)
Subject: staging: comedi: (core): add comedi_dev_from_file_info()
X-Git-Tag: v3.9-rc1~127^2~444
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba1bcf6f23e192e88b7c07d20d6221a0bcb7929e;p=pandora-kernel.git

staging: comedi: (core): add comedi_dev_from_file_info()

Setting `info = comedi_file_info_from_minor(minor)` and `dev =
comedi_dev_from_minor(minor)` in the same function is a bit of a waste.
The latter function is just a call of the former followed by a
conditional return of an embedded pointer (`info->device`) or NULL.  The
former function uses a spin-lock which is where the wastfulness comes
in.

Move the "followed by a conditional return of an embedded pointer" part
into a new function `comedi_dev_from_file_info` and call this instead of
`comedi_dev_from_minor()` in the places where
`comedi_file_info_from_minor()` is also called.

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