Subject: Re: [PATCH 4/4] dma-mapping: clear dev->dma_ops in arch_teardown_dma_ops

From: Christoph Hellwig <[email-masked]>
Date: Tue, 25 Sep 2018 22:16:19 +0200

Looking at the code I think this commit is simply broken for
architectures not using arch_setup_dma_ops, but instead setting up
the dma ops through arch specific magic.

I'll revert the patch.