On Thu, 27 Dec 2012, Larry Finger wrote:
I could not do exactly the experiment that you wanted, as ehci-hcd was loaded
even though it was blacklisted. Rather than solve that problem, I generated a
kernel from just before commit adfa79d with ohci-hcd built in and ehci-hcd as a
module. This one generated the errors, but they stopped when ehci-hcd loaded. I
also tested a 3.8-rc1 kernel with ehci-hcd and ehcd-pci built in and ohci-hcd as
a module. No errors for that one. Your hypothesis looks correct.
I hope there is some way to force ehci-pci to load as soon as ehci-hcd is
loaded, and before ohci-hcd loads, but if there is not, I know how to prevent
the errors on my system even though this solution won't help the users of distro
kernels. At least this time the errors stop once all 3 modules are loaded, and
the number of error outputs is limited.
This is now a userspace issue. Perhaps a change to a udev rule will
prevent ohci-hcd from loading until ehci-pci is in place. Or a change
to a startup script in your initramfs. However the problem gets
solved, there doesn't seem to be much the kernel can do about it.