linux-kernel - Re: [PATCH 03/13] dmaengine: up-level reference counting to the module level

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Message-ID: <e9c3a7c20812081439m8161812nca092e0ed3114e57@mail.gmail.com>
Date:	Mon, 8 Dec 2008 15:39:01 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Guennadi Liakhovetski" <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	maciej.sosnowski@...el.com, hskinnemoen@...el.com,
	nicolas.ferre@...el.com
Subject: Re: [PATCH 03/13] dmaengine: up-level reference counting to the module level

On Thu, Dec 4, 2008 at 12:28 PM, Guennadi Liakhovetski
<g.liakhovetski@....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.
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