linux-kernel - Re: [PATCH] dmaengine: pl330: use subsys

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Message-ID: <20141017073535.GN1638@intel.com>
Date:	Fri, 17 Oct 2014 13:05:35 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Ray Jui <rjui@...adcom.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Scott Branden <sbranden@...adcom.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: pl330: use subsys_initcall

On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
> On 10/17/2014 02:48 AM, Ray Jui wrote:
> >As part of subsystem that many slave drivers depend on, it's more
> >appropriate for the pl330 DMA driver to be initialized at
> >subsys_initcall than device_initcall
> 
> Well, we do have -EPROBE_DEFER these days to handle these kinds of
> dependencies so we no longer have to these kinds of manual init
> reordering tricks.
How ould that work?

Consider for example SPI and dmanegine. SPI driver got probed, then to start
a transaction requested a channel... while dmaengine driver is still getting
probed/not probed yet. So SPI driver didnt get a channel.

-- 
~Vinod

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