linux-kernel - Re: [PATCH 7/8] dmaengine/dw_dmac: Unmap all memory buffers after completion of slave transfers

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Message-ID: <4F140DB7.3060300@st.com>
Date:	Mon, 16 Jan 2012 17:14:55 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	Pratyush ANAND <pratyush.anand@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	Mirko GARDI <mirko.gardi@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vipin KUMAR <vipin.kumar@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Amit VIRDI <Amit.VIRDI@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	Deepak SIKRI <deepak.sikri@...com>,
	Bhavna YADAV <bhavna.yadav@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Vincenzo FRASCINO <Vincenzo.FRASCINO@...com>
Subject: Re: [PATCH 7/8] dmaengine/dw_dmac: Unmap all memory buffers after
 completion of slave transfers

On 1/16/2012 4:24 PM, Russell King - ARM Linux wrote:
> Note that DMA engine drivers are not responsible for unmapping the buffers
> when the transfer completes - that is the responsibility of the caller.
> 
> The automatic buffer unmapping is required for the async_tx APIs and
> offload APIs.

In dw_dmac, it is only done for slave transfers. Is this Okay ??

-- 
viresh
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