From 1b90779b238a8554a465fb99b3828a9e0500ff2a Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Mon, 20 Oct 2014 11:34:08 -0700
Subject: [PATCH] staging: comedi: addi_apci_3120: DMA requires an interrupt

An interrupt is required for DMA to work.

Factor out the DMA buffer allocation from the (*auto_attach) and only
allocate the buffers if the interrupt is available.

For aesthetics, also factor the DMA buffer free from the (*detach).

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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Reading git-format-patch failed