linux-kernel - Re: [PATCH v3 4/4] dw_dmac: return proper residue value

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Date:	Thu, 24 Jan 2013 16:15:17 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH v3 4/4] dw_dmac: return proper residue value

I told you, we can get rid of that routine :)

On Thu, Jan 24, 2013 at 4:04 PM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:

I don't see residue - len from interrupt handler. It isn't required?

> @@ -1062,6 +1090,7 @@ dwc_tx_status(struct dma_chan *chan,
>               struct dma_tx_state *txstate)
>  {
>         struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
> +       unsigned long           flags;
>         enum dma_status         ret;
>
>         ret = dma_cookie_status(chan, cookie, txstate);
> @@ -1071,8 +1100,17 @@ dwc_tx_status(struct dma_chan *chan,
>                 ret = dma_cookie_status(chan, cookie, txstate);
>         }
>
> -       if (ret != DMA_SUCCESS)
> -               dma_set_residue(txstate, dwc_first_active(dwc)->len);
> +       spin_lock_irqsave(&dwc->lock, flags);
> +
> +       if (ret != DMA_SUCCESS) {
> +               u32 residue = dwc->residue;

If you agree with the explanation that i gave in last mail, you must drop lock
right here. and also take it in this if block.

> +               if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
> +                       residue -= dwc_get_sent(dwc);
> +               dma_set_residue(txstate, residue);
> +       }
> +
> +       spin_unlock_irqrestore(&dwc->lock, flags);

other than that:

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
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