From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrey Borzenkov <arvidjaar@mail.ru>
Date: Mon, 22 Feb 2010 06:42:31 +0000
Subject: Warning! ehci_hcd should always be loaded before uhci_hcd and ohci_hcd
Message-Id: <201002220942.35158.arvidjaar@mail.ru>
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This is in 2.6.33-rc8 currently but has been true for a long time.

Ever since my distribution completely switched to (hot-/cold-)plugging=20
all needed modules I get this:

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
Warning! ehci_hcd should always be loaded before uhci_hcd and ohci_hcd,=20
not after

During cold plugging uhci comes before ehci simply by virtue of=20
directory traversal order:

00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI=20
Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI=20
Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI=20
Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI=20
Controller #1 (rev 02)


{pts/1}% ls -f1 /sys/devices/pci0000:00
[...]
0000:00:1d.0/
0000:00:1d.1/
0000:00:1d.2/
0000:00:1d.7/
[...]

So my question is - is the warning still true? How serious problems can=20
result if uhci is loaded before ehci?

Does it make sense to workaround it in udev or may be trivial

install uhci_hcd mdprobe ehci_hcd; modprobe --ignore-install uhci_hcd

would be enough?

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