From 06551fda7e0f07250884c0cf47d1286da0a5651c Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 26 Nov 2013 16:41:59 -0700
Subject: [PATCH] staging: comedi: dt282x: tidy up the irq support in
 dt282x_attach()

An irq is only needed by this driver in order to support async commands.
Since it is optional, modify the attach so that if the request_irq() fails
the attach does not fail.

Remove the printk noise about the irq.

Only hookup the async command support if the request_irq() was successful.

Also, only call dt282x_grab_dma() if we have an irq since interrupt support
is needed to support dma.

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