linux-kernel - Re: [PATCHv6 3/8] dma-mapping: add dma_{map,unmap}

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Date:	Tue, 17 May 2016 10:54:45 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
Cc:	vinod.koul@...el.com, linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org,
	hch@...radead.org, linux-arch@...r.kernel.org,
	geert+renesas@...der.be, arnd@...db.de, linus.walleij@...aro.org,
	laurent.pinchart@...asonboard.com, dan.j.williams@...el.com
Subject: Re: [PATCHv6 3/8] dma-mapping: add dma_{map,unmap}_resource

>  
> -In some circumstances dma_map_single() and dma_map_page() will fail to create
> -a mapping. A driver can check for these errors by testing the returned
> -DMA address with dma_mapping_error(). A non-zero return value means the mapping
> -could not be created and the driver should take appropriate action (e.g.
> -reduce current DMA mapping usage or delay and try again later).
> +In some circumstances dma_map_single(), dma_map_page() and dma_map_resource()
> +will fail to create a mapping. A driver can check for these errors by testing
> +the returned DMA address with dma_mapping_error(). A non-zero return value
> +means the mapping could not be created and the driver should take appropriate
> +action (e.g. reduce current DMA mapping usage or delay and try again later).

This looks like it belongs to another patch?