linux-kernel - Re: dw_dmac driver questions

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Message-Id: <20090105.230230.132760259.anemo@mba.ocn.ne.jp>
Date:	Mon, 05 Jan 2009 23:02:30 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	haavard.skinnemoen@...el.com
Cc:	linux-kernel@...r.kernel.org, maciej.sosnowski@...el.com,
	dan.j.williams@...el.com
Subject: Re: dw_dmac driver questions

On Mon, 29 Dec 2008 23:39:32 +0900 (JST), Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:
> Hi.  I'm writing a new DMA driver, using dw_dmac driver in kernel
> 2.6.28 as a reference implementation.
> 
> I can see an outline of the dw_dmac driver and framework (well,
> hopefully), but have some questions in details.

One more.

4. This is a comment on head of dwc_handle_error().

	/*
	 * The descriptor currently at the head of the active list is
	 * borked. Since we don't have any way to report errors, we'll
	 * just have to scream loudly and try to carry on.
	 */

But, the bad descriptor can be at any place of the active list, no ?
For example, if the active list contained two descriptor and latter
was broken and tasklet was delayed by some reason, the head of the
list should be good.

---
Atsushi Nemoto
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