Re: [PATCH 12/16] staging/comedi: mark as broken
From: Christoph Hellwig <hch@lst.de>
Date: 2019-06-14 14:49:30
Also in:
dri-devel, intel-gfx, linux-arm-kernel, linux-iommu, linux-media, linux-mm, linux-rdma, linux-s390, linux-wireless, lkml
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).