From 729988507680b2ce934bce61d9ce0ea7b235914c Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 26 Nov 2013 16:41:43 -0700
Subject: [PATCH] staging: comedi: das16m1: tidy up the irq support in
 das16m1_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 an invalid irq is
selected by the user, or the request_irq() fails, the attach does not
fail.

Remove all the printk noise about the irq.

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

Tidy up das16m1_irq_bits() a bit. This helper returns the value that needs
to be written to the DAS16M1_INTR_CONTROL register to setup the irq routing.

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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