Re: [PATCH 12/16] staging/comedi: mark as broken

Christoph Hellwig
2019-06-14T14:49:31Z

On Fri, Jun 14, 2019 at 04:02:39PM +0200, Greg KH wrote:
> Perhaps a hint as to how we can fix this up? This is the first time
> I've heard of the comedi code not handling dma properly.

It can be fixed by:

a) never calling virt_to_page (or vmalloc_to_page for that matter)
on dma allocation
b) never remapping dma allocation with conflicting cache modes
(no remapping should be doable after a) anyway).