From mboxrd@z Thu Jan  1 00:00:00 1970
From: hch@lst.de (Christoph Hellwig)
Date: Fri, 23 Nov 2018 07:55:11 +0100
Subject: remove the ->mapping_error method from dma_map_ops V2
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On Thu, Nov 22, 2018 at 09:55:25AM -0800, Linus Torvalds wrote:
> No, the big immediate benefit of allowing "return -EINVAL" etc is
> simply legibility and error avoidance.

Well, I can tweak the last patch to return -EINVAL from dma_mapping_error
instead of the old 1 is as bool true.  The callers should all be fine,
although I'd have to audit them.  Still wouldn't help with being able to
return different errors.