On Tue, Dec 04, 2018 at 04:41:34PM +0000, Robin Murphy wrote:

I'd have been inclined to put the default check here, i.e.

-	return 0
+	return dma_addr == DMA_MAPPING_ERROR

such that the callback retains full precedence and we don't have to deal 
with the non-trivial removals immediately if it comes to it. Not that it 
makes a vast difference though, so either way,

Ok, I've switched it around.

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