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

On 25/09/18 21:16, Christoph Hellwig wrote:

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.

Ugh, sorry about missing that too. Ack to a revert - thinking about 
those PPC symptoms, it might actually be that other architectures could 
also get into the same pickle just by unbinding and rebinding a driver 
(e.g. switching to VFIO then back again).

Robin.