Comment # 39 on bug 1202492 from Takashi Iwai

Good to hear.

As far as I understand, this is a regression due to the IOMMU DMA ownership
support, as it seems (the upstream commit
512881eacfa72c2136b27b9934b7b27504a9efc2).
The PCI core receives -EBUSY from iommu_device_use_default_domain() at
pci_dma_configure() for HD-audio devices by some reason, resulting in the probe
error.

It seems that the problem happens only with AMD, so far, and not on every AMD
platform.

Joerg, could you take a look?