linux-kernel - Re: [PATCH 15/16] dmaengine: add transfered member to dma_async_tx

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Message-ID: <20130726093015.GA2439@breakpoint.cc>
Date:	Fri, 26 Jul 2013 11:30:15 +0200
From:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	balbi@...com, george.cherian@...com,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>
Subject: Re: [PATCH 15/16] dmaengine: add transfered member to
 dma_async_tx_descriptor

On Thu, Jul 25, 2013 at 05:32:35PM +0200, Lars-Peter Clausen wrote:
> > I see. But it can't be reused before calling the callback if it is
> > going to call the callback, right?
> > So if this is a no-no, I'm left with an additional argument to the
> > complete callback?
> 
> Hm, maybe using dmaengine_tx_status() and checking the residue field of the
> state struct. transferred is basically len - residue.

This might actually work. So this would reduce the patch to simply update the
kernel doc for residue in struct dma_tx_state that it might also be valid for
DMA_SUCCESS.

Sebastian
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