Re: MT76x2U crashes XHCI driver on AMD Ryzen system

[Joerg Roedel]

On Tue, Feb 26, 2019 at 11:34:51AM +0100, Stanislaw Gruszka wrote:
> On Tue, Feb 26, 2019 at 11:05:36AM +0100, Joerg Roedel wrote:
> If sg->offset > PAGE_SIZE is fine then most likely we have problem with
> alignment.

The map_sg implementation in the AMD IOMMU driver uses sg_phys() which
handles the sg->page + sg->offset calculation fine.

> Note hat issue is with dma_map_sg(), switching to dma_map_single()
> by using urb->transfer_buffer instead of urb->sg make things work
> on AMD IOMMU.

On the other hand this points to a bug in the driver, I'll look further
if I can spot something there.

Regards,

	Joerg