at 08:23 on Sun 21-Aug-2022 Christoph Hellwig (hch@lst.de) wrote:
On Thu, Aug 18, 2022 at 04:47:14PM +0200, Greg Kroah-Hartman wrote:
What is the output of the lspci -v for the USB 3 controller?
Christoph, any ideas?
Well, with that commit it must be related to dma ops selection. As this appears to be an AMD system the options here are direct, amd_iommu and possibly amd_gart as the odd one in the mix.
Alan, can you send me your .config?
I hope that with the following information there is no need for me to do so.
It is indeed an old AMD CPU Model name: AMD FX(tm)-4300 Quad-Core Processor CPU family: 21 Model: 2
Comparing with another AMD system that doesn't show the problem, I see that CONFIG_GART_IOMMU is only set on the one with the problem.
The configs have just had "make oldconfig" run on them for years, I have no idea why one has it set.
Clearing it fixes the problem!
Thanks for the hint, although there is a still wider issue with this regression.
$ diff .config.old .config 353c353 < CONFIG_GART_IOMMU=y ---
# CONFIG_GART_IOMMU is not set
4683d4682 < CONFIG_IOMMU_HELPER=y 4987d4985 < # CONFIG_IOMMU_DEBUG is not set $