Re: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)

[Alexey Dobriyan]

Hmmm, there was a wonderful oops on interface stop here when the other end
of atl1 cable was physically unplugged (but there was traffic before):

	atl1_down
	atl1_clean_rx_ring
	swiotlb_unmap_single
	swiotlb_unmap_single_attrs
	memcpy_c

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