linux-kernel - Re: [PATCH v4] MTD: LPC32xx SLC NAND driver

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Message-ID: <20120603203749.GD23368@n2100.arm.linux.org.uk>
Date:	Sun, 3 Jun 2012 21:37:49 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Roland Stigge <stigge@...com.de>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	dwmw2@...radead.org, kevin.wells@....com, srinivas.bakki@....com,
	linux-arm-kernel@...ts.infradead.org, hechtb@...glemail.com,
	lars@...afoo.de, b32955@...escale.com, leiwen@...vell.com,
	dedekind1@...il.com
Subject: Re: [PATCH v4] MTD: LPC32xx SLC NAND driver

On Sun, Jun 03, 2012 at 09:49:40PM +0200, Roland Stigge wrote:
> Hi!
> 
> Thanks for the suggestions!
> 
> On 03/06/12 21:09, Russell King - ARM Linux wrote:
> >> +	dma_async_issue_pending(host->dma_chan);
> >> +
> >> +	wait_for_completion_timeout(&host->comp, msecs_to_jiffies(1000));
> > 
> > What about unmapping the buffer upon completion?
> 
> OK - by not specifying DMA_COMPL_SKIP_*_UNMAP in flags, I was thinking
> that this happens somehow magically. ;-) But maybe I was just confused.

Slave transfers should never be automatically unmapped by the DMA engine
driver.
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