linux-kernel - Re: [PATCH v2 1/4] dma-mapping: Add devm_ interface for dma_map

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Message-ID: <20140604141416.GD5004@htj.dyndns.org>
Date:	Wed, 4 Jun 2014 10:14:16 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Shuah Khan <shuah.kh@...sung.com>,
	Eli Billauer <eli.billauer@...il.com>,
	devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
	bhelgaas@...gle.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
	discuss@...-64.org
Subject: Re: [PATCH v2 1/4] dma-mapping: Add devm_ interface for
 dma_map_single()

Hello,

On Wed, Jun 04, 2014 at 04:12:11PM +0200, Joerg Roedel wrote:
> Yes, but those drivers usually get DMA buffers at init time with the
> dma_alloc_* interfaces. The dma_map_* interfaces discussed here belong
> to the streaming DMA-API, so they are usually used for only one DMA
> transaction before dma_unmap_* is called on them.
> 
> A devm interface for the dma_alloc_* family of functions would
> actually make sense, but not for the dma_map_* functions.

Ah, okay.  Fair enough.

Thanks.

-- 
tejun
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