Regression: USB 3.0 stick only running at USB 2.0 speed

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[Originally reported at
https://bugzilla.kernel.org/show_bug.cgi?id=84611, gregkh told me to
report it here]

My brother's USB 3.0 stick is only recognized as USB 2.0.

I reproduced this bug in kernels 3.14.15, 3.16, and 3.16.2; as built by Debian.
It used to work correctly in 3.14-rc6. The data below is from 3.14.15.

Dmesg
======
[   17.490026] usb 1-2: new high-speed USB device number 2 using xhci_hcd
[   17.681501] usb 1-2: New USB device found, idVendor=8564, idProduct=1000
[   17.681508] usb 1-2: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[   17.681512] usb 1-2: Product: Mass Storage Device
[   17.681515] usb 1-2: Manufacturer: JetFlash
[   17.681517] usb 1-2: SerialNumber: ID8UQEDI

Controller
==========
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI])
    Subsystem: Lenovo Device 21fa
    Flags: bus master, medium devsel, latency 0, IRQ 40
    Memory at f2520000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: <access denied>
    Kernel driver in use: xhci_hcd

Device
======
Bus 001 Device 002: ID 8564:1000
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x8564
  idProduct          0x1000
  bcdDevice            1.00
  iManufacturer           1 JetFlash
  iProduct                2 Mass Storage Device
  iSerial                 3 ID8UQEDI
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)

-- 
Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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