netdev - Re: [V2 PATCH 2/5] arm64 : Introduce support for ACPI

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Date:	Tue, 05 May 2015 17:44:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	rjw@...ysocki.net, lenb@...nel.org, catalin.marinas@....com,
	will.deacon@....com, thomas.lendacky@....com,
	herbert@...dor.apana.org.au, davem@...emloft.net,
	al.stone@...aro.org, linaro-acpi@...ts.linaro.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, leo.duran@....com,
	hanjun.guo@...aro.org, msalter@...hat.com, grant.likely@...aro.org,
	linux-crypto@...r.kernel.org
Subject: Re: [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object

On Tuesday 05 May 2015 10:12:06 Suravee Suthikulpanit wrote:
> +struct dma_map_ops dummy_dma_ops = {
> +       .alloc                  = __dummy_alloc,
> +       .free                   = __dummy_free,
> +       .mmap                   = __dummy_mmap,
> +       .map_page               = __dummy_map_page,
> +       .unmap_page             = __dummy_unmap_page,
> +       .map_sg                 = __dummy_map_sg,
> +       .unmap_sg               = __dummy_unmap_sg,
> +       .sync_single_for_cpu    = __dummy_sync_single_for_cpu,
> +       .sync_single_for_device = __dummy_sync_single_for_device,
> +       .sync_sg_for_cpu        = __dummy_sync_sg_for_cpu,
> +       .sync_sg_for_device     = __dummy_sync_sg_for_device,
> +       .mapping_error          = __dummy_mapping_error,
> +       .dma_supported          = __dummy_dma_supported,
> +};
> +EXPORT_SYMBOL(dummy_dma_ops);
> +
> 

This will clearly work, but I think it's easier to just leave
the dma_mask pointer as NULL when creating the platform device,
which should let the normal dma ops fail all the callbacks.

	Arnd
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