USB Card reader constantly resets with xhci

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Hi,

I just recently moved an internal USB card reader from an ehci machine
to an xhci machine, and dmesg is filled with this message over and
over again:
[ 1596.047684] usb 1-8: reset high-speed USB device number 4 using xhci_hcd
[ 1596.090902] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b06d700
[ 1596.090904] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b06d740

This did not happen on the ehci machine. Oddly, the card reader still
works, but it just keeps printing that message in the log.

-Joe Yasi


dmesg:
[    2.121631] usb 1-8: new high-speed USB device number 4 using xhci_hcd
[    2.479333] Switched to clocksource tsc
[    2.719236] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[    3.034283] usb 1-8: New USB device found, idVendor=054c, idProduct=01bd
[    3.034305] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    3.034326] usb 1-8: Product: USB 2.0 MultiCard R/W
[    3.034341] usb 1-8: Manufacturer: Sony
[    3.034355] usb 1-8: SerialNumber: 2B1060000FAD
[    3.036450] usb-storage 1-8:1.0: USB Mass Storage device detected
[    3.036499] scsi8 : usb-storage 1-8:1.0
[    3.036548] usbcore: registered new interface driver usb-storage
-- snip --
[    9.022011] usb 1-8: reset high-speed USB device number 4 using xhci_hcd
[    9.065195] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e4480
[    9.065197] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e44c0
--
[   11.392706] usb 1-8: reset high-speed USB device number 4 using xhci_hcd
[   11.435895] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e4480
[   11.435899] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e44c0
--
[   16.250041] usb 1-8: reset high-speed USB device number 4 using xhci_hcd
[   16.293239] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e4480
[   16.293241] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
with disabled ep ffff88041b7e44c0
--

lsusb -vv -s 1:4
Bus 001 Device 004: ID 054c:01bd Sony Corp. MRW62E Multi-Card Reader/Writer
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x054c Sony Corp.
  idProduct          0x01bd MRW62E Multi-Card Reader/Writer
  bcdDevice           51.95
  iManufacturer           1 Sony
  iProduct                2 USB 2.0 MultiCard R/W
  iSerial                 3 2B1060000FAD
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4 CARD READER
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              5 Bulk-In, Bulk-Out, Interface
      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)
--
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