Problems with USB devices connecting to UHCI instead of EHCI

[Kevin Oberman]

If I load umass after plugging in a disk or flash fob, it will be
connected as a UHCI device. If I load umass and then connect the device,
it is properly connected as EHCI. When connected as a UHCI device, it is
too slow to be useful.

Looks like a race condition as the EHCI is the last USB device probed. I
suspect that the disk is already connected to a UHCI device before an
EHCI device is found.

uhci0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> port 0x1800-0x181f irq 11 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-B> port 0x1820-0x183f irq 11 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-C> port 0x1840-0x185f irq 11 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
uhci3: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-D> port 0x1860-0x187f irq 11 at device 29.3 on pci0
uhci3: [GIANT-LOCKED]
uhci3: [ITHREAD]
usb3: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-D> on uhci3
usb3: USB revision 1.0
uhub3: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb3
uhub3: 2 ports with 2 removable, self powered
ehci0: <Intel 82801FB (ICH6) USB 2.0 controller> mem 0xb0000000-0xb00003ff irq 11 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb4: EHCI version 1.0
usb4: companion controllers, 2 ports each: usb0 usb1 usb2 usb3
usb4: <Intel 82801FB (ICH6) USB 2.0 controller> on ehci0
usb4: USB revision 2.0
uhub4: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb4
uhub4: 8 ports with 8 removable, self powered

Any idea if this is fixable? Not a huge problem, but an annoying
one. Will the new USB system (hopefully coming soon) deal with this?
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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