On Tue, Mar 17, 2015 at 12:46:12AM -0500, Andy Gross wrote:
> +static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t
> cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct adm_chan *achan = to_adm_chan(chan);
> + struct virt_dma_desc *vd;
> + enum dma_status ret;
> + unsigned long flags;
> + size_t residue = 0;
> +
> + ret = dma_cookie_status(chan, cookie, txstate);
> + if (ret == DMA_COMPLETE || !txstate)
> + return ret;
> +
> + spin_lock_irqsave(&achan->vc.lock, flags);
> +
> + vd = vchan_find_desc(&achan->vc, cookie);
> + if (vd)
> + residue = container_of(vd, struct adm_async_desc, vd)->length;
> +
> + spin_unlock_irqrestore(&achan->vc.lock, flags);
> +
> + /*
> + * residue is either the full length if it is in the issued list, or 0
> + * if it is in progress. We have no reliable way of determining
> + * anything inbetween
> + */
> + dma_set_residue(txstate, residue);
> +
> + if (achan->error)
> + return DMA_ERROR;
but this may not be for the current descriptor right, which is queued?
--
~Vinod
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