AFAICS, all callers of dma_skb_copy_datagram_iovec()
are either
* recursive for fragments, pass pinned_list unchanged or
* called from tcp, with pinned_list coming from
tp->ucopy.pinned_list and only when tp->ucopy.dma_chan is non-NULL.
Now, all non-NULL assignments to ->dma_chan have the same form:
if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
tp->ucopy.dma_chan = get_softnet_dma();
IOW, if ->ucopy.pinned_list stays NULL, ->ucopy.dma_chan will do the same.
Moreover, any place that resets ->ucopy.pinned_list will also reset
->ucopy.dma_chan.
IOW, we can't ever get non-NULL tp->ucopy.dma_chan while tp->ucopy.pinned_list
is NULL. So how can we ever get to the dma_memcpy_to_kernel_iovec()?
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