netdev - Re: [PATCH] Fix IXP4xx coherent allocations

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Message-Id: <20130323.195740.2108147521543354261.davem@davemloft.net>
Date:	Sat, 23 Mar 2013 19:57:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	khc@...waw.pl
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, c.aeschlimann@...-group.ch
Subject: Re: [PATCH] Fix IXP4xx coherent allocations

From: Krzysztof Halasa <khc@...waw.pl>
Date: Sat, 23 Mar 2013 20:35:46 +0100

> ARM core code currently requires coherent DMA mask to be set. Make sure
> we limit PCI devices to 64 MiB while allowing on-chip devices to access
> the whole 4 GiB address space.
> 
> This fixes a v3.7+ regression which broke IXP4xx built-in network devices.
> 
> Signed-off-by: Krzysztof Ha┅asa <khc@...waw.pl>

This requirement is not reasonable.

The DMA API documentation clearly states what the default must be,
and what drivers are guarenteed will be the default.
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