[Bug 215531] USB hub sometimes fails to attach

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215531

            Bug ID: 215531
           Summary: USB hub sometimes fails to attach
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

I have a 10 port USB 2.0 hub which is implemented internally as three four-port
hubs. Two ports come directly from the first hub, and the other 8 ports are
each behind two hubs.

When I plug it into my X220 laptop running -current at r309124 it sometimes
works:

Dec 24 02:47:38 volta kernel: ugen0.5: <vendor 0x214b USB2.0 HUB> at usbus0
Dec 24 02:47:38 volta kernel: uhub4 on uhub3
Dec 24 02:47:38 volta kernel: uhub4: <vendor 0x214b USB2.0 HUB, class 9/0, rev
2.00/1.00, addr 5> on usbus0
Dec 24 02:47:39 volta kernel: uhub4: 4 ports with 4 removable, self powered
Dec 24 02:47:40 volta kernel: ugen0.6: <vendor 0x214b USB2.0 HUB> at usbus0
Dec 24 02:47:40 volta kernel: uhub5 on uhub4
Dec 24 02:47:40 volta kernel: uhub5: <vendor 0x214b USB2.0 HUB, class 9/0, rev
2.00/1.00, addr 6> on usbus0
Dec 24 02:47:40 volta kernel: uhub5: 4 ports with 4 removable, self powered
Dec 24 02:47:41 volta kernel: ugen0.7: <vendor 0x214b USB2.0 HUB> at usbus0
Dec 24 02:47:41 volta kernel: uhub6 on uhub4
Dec 24 02:47:41 volta kernel: uhub6: <vendor 0x214b USB2.0 HUB, class 9/0, rev
2.00/1.00, addr 7> on usbus0
Dec 24 02:47:42 volta kernel: uhub6: 4 ports with 4 removable, self powered

and sometimes one of the hubs fails to attach:

Dec 24 02:47:47 volta kernel: ugen0.5: <vendor 0x214b USB2.0 HUB> at usbus0
Dec 24 02:47:47 volta kernel: uhub4 on uhub3
Dec 24 02:47:47 volta kernel: uhub4: <vendor 0x214b USB2.0 HUB, class 9/0, rev
2.00/1.00, addr 5> on usbus0
Dec 24 02:47:47 volta kernel: uhub4: 4 ports with 4 removable, self powered
Dec 24 02:47:48 volta kernel: ugen0.6: <vendor 0x214b USB2.0 HUB> at usbus0
Dec 24 02:47:48 volta kernel: uhub5 on uhub4
Dec 24 02:47:48 volta kernel: uhub5: <vendor 0x214b USB2.0 HUB, class 9/0, rev
2.00/1.00, addr 6> on usbus0
Dec 24 02:47:49 volta kernel: uhub5: 4 ports with 4 removable, self powered
Dec 24 02:47:50 volta kernel: usb_alloc_device: set address 7 failed
(USB_ERR_IOERROR, ignored)
Dec 24 02:47:52 volta kernel: usbd_setup_device_desc: getting device descriptor
at addr 7 failed, USB_ERR_IOERROR
Dec 24 02:47:52 volta kernel: usbd_req_re_enumerate: addr=7, set address
failed! (USB_ERR_IOERROR, ignored)
Dec 24 02:47:54 volta kernel: usbd_setup_device_desc: getting device descriptor
at addr 7 failed, USB_ERR_IOERROR
Dec 24 02:47:55 volta kernel: usbd_req_re_enumerate: addr=7, set address
failed! (USB_ERR_IOERROR, ignored)
Dec 24 02:47:57 volta kernel: usbd_setup_device_desc: getting device descriptor
at addr 7 failed, USB_ERR_IOERROR
Dec 24 02:47:57 volta kernel: usbd_req_re_enumerate: addr=7, set address
failed! (USB_ERR_IOERROR, ignored)
Dec 24 02:47:59 volta kernel: usbd_setup_device_desc: getting device descriptor
at addr 7 failed, USB_ERR_IOERROR
Dec 24 02:48:00 volta kernel: usbd_req_re_enumerate: addr=7, set address
failed! (USB_ERR_IOERROR, ignored)
Dec 24 02:48:01 volta kernel: usbd_setup_device_desc: getting device descriptor
at addr 7 failed, USB_ERR_IOERROR
Dec 24 02:48:01 volta kernel: ugen0.7: <Unknown > at usbus0 (disconnected)
Dec 24 02:48:01 volta kernel: uhub_reattach_port: could not allocate new device

USB controller is:

ehci0 at pci0:0:26:0:      class=0x0c0320 card=0x21da17aa chip=0x1c2d8086 rev=0x04
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '6 Series/C200 Series Chipset Family USB Enhanced Host
Controller'
    class      = serial bus
    subclass   = USB

by contrast it consistently attaches successfully on my stable/10 r306697
desktop, with:

ehci0 at pci0:0:26:0:      class=0x0c0320 card=0x50061458 chip=0x1e2d8086 rev=0x04
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C216 Chipset Family USB Enhanced Host Controller'
    class      = serial bus
    subclass   = USB

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