linux-kernel - Re: [PATCH v3.5] dw_dmac: return proper residue value

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Message-ID: <CAOh2x==-amzWv_8s736LQ4AXi35kQY3q3VFLmSaTFBG7A_d0BA@mail.gmail.com>
Date:	Fri, 25 Jan 2013 15:00:19 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH v3.5] dw_dmac: return proper residue value

On Fri, Jan 25, 2013 at 2:49 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Fri, Jan 25, 2013 at 11:07 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> Who is going to right on ctlhi/lo?

Ahh, my English :( (/s/right/write)

> dwc_do_single_block()
>
>> we write to ctlhi/lo only when we program new
>> transfer. and that is not going to happen while we are in middle of a transfer.
>
> We have got a tasklet running inside tx_status call. Isn't possible?
> tasklet runs scan_descriptors, that continues transfer in soft LLP mode.

But we have just executed scan_descriptor() before this function and it doesn't
look possible that transfer wasn't over then and inbetween these calls we got an
interrupt, scheduled an tasklet and called dwc_do_single_block() :)
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