Messages in this thread |  | | Date | Fri, 25 Jan 2013 11:19:40 +0200 | Subject | Re: [PATCH v3.5] dw_dmac: return proper residue value | From | Andy Shevchenko <> |
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On Fri, Jan 25, 2013 at 11:07 AM, Viresh Kumar <viresh.kumar@linaro.org> wrote: > On 25 January 2013 14:34, Andy Shevchenko <andy.shevchenko@gmail.com> wrote: >> Okay, we have to have a protection here because get_sent reads two >> registers consequentially. This means we could end up with scenario >> with threads 1 and 2 >> >> 1. read ctlhi >> 2. write ctlhi >> 2. write ctllo >> 1. read ctllo > > Who is going to right on ctlhi/lo?
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.
-- With Best Regards, Andy Shevchenko
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