From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Dan Williams" <dan.j.williams@intel.com>
Subject: Re: [PATCH 03/13] dmaengine: up-level reference counting to the module level
Date: Mon, 8 Dec 2008 15:39:01 -0700
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On Thu, Dec 4, 2008 at 12:28 PM, Guennadi Liakhovetski
<g.liakhovetski@gmx.de> wrote:
> Ok, but why not postpone calling .device_alloc_chan_resources() until a
> channel is _found_?

dma_find_channel() is called in fast paths (atomic contexts, I/O
writeout), so we need to allocate ahead of time.