linux-kernel - Re: [PATCH 2/6] dmaengine/dw_dmac: Enable resubmission from callback routine.

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Message-ID: <4DAD2A61.4020406@st.com>
Date:	Tue, 19 Apr 2011 11:53:29 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Armando VISCONTI <armando.visconti@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	amitgoel <amit.goel@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	"jamie@...ieiles.com" <jamie@...ieiles.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Re: [PATCH 2/6] dmaengine/dw_dmac: Enable resubmission from callback
 routine.

On 04/19/2011 11:42 AM, Koul, Vinod wrote:
> On 04/18/2011 04:20 PM, viresh kumar wrote:
>>
>> Resubmission of new transfer must be allowed from callbacks. For this release
>> lock before calling callback routine and enable them again.
> Why would you like to do that?
> 
> IMO it's not a good thing as you are essentially doing it in your tasklet...
> Make sure the submit() is done by client before this and you use it to start
> next transaction in you tasklet and let client know in callback txn is
> finished.
> 

Vinod,

I initiated this discussion few days back on a separate thread:

http://www.spinics.net/lists/arm-kernel/msg121139.html

And so implemented this.

-- 
viresh
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