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Date: Fri, 25 Jan 2013 14:37:10 +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 25 January 2013 14:34, Andy Shevchenko <andy.shevchenko@...il.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? 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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