Hi Dan,
I think you have a bug in this function, the list_splice_init adds the
new slots in the head of the chain_node, but you get the
old_chain_tail (latest descriptor) from the tail of the chain!!
> +static dma_cookie_t
> +iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
> +{
> +
> + old_chain_tail = list_entry(iop_chan->chain.prev,
> + struct iop_adma_desc_slot, chain_node);
> + list_splice_init(&sw_desc->group_list, &old_chain_tail->chain_node);
> +
> + /* fix up the hardware chain */
> + iop_desc_set_next_desc(old_chain_tail, grp_start->phys);
> +
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