From 8ab4fe7e13989ef5b11bd96f1ed6763eabb1d17d Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 6 May 2014 13:12:13 +0100
Subject: [PATCH] staging: comedi: pass subdevice to __comedi_buf_write_alloc()

Local function `__comedi_buf_write_alloc()` is called by
`comedi_buf_write_alloc()` and `comedi_buf_put()`.  It currently takes a
pointer to a `struct comedi_async`.  Change it to take a pointer to a
`struct comedi_subdevice` and use the `async` member for consistency
with other comedi buffer handling functions.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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