Bug#738113: linux-image-3.12-1-amd64: regression in xhci_hcd: USB3 doesn't work anymore

[Alberto Garcia <berto@igalia.com>]

I have a similar problem, but it also fails with Linux 3.13.5-1
here. I had to come back to 3.11.10-1 to make it work again (I only
tried the latest from the 3.12 series though).

sd 8:0:0:0: [sdb] Attached SCSI disk
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064d80
xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8802d1064dc0
sd 8:0:0:0: [sdb] Unhandled error code
sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
sd 8:0:0:0: [sdb] CDB:
Read(10): 28 00 00 00 00 3f 00 00 04 00
usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd

Berto