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[Rachel Greenham <1293361@xxxxxxxxxxxxxxxxxx>]

FYI this also seems to have fixed a problem I was having with a USB
DVB-S2 receiver, which apparently caused the drivers to hang on load
*only* on xHCI; on EHCI, same kernel, all was fine. So this may not have
been purely a mass storage device issue.

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https://bugs.launchpad.net/bugs/1293361

Title:
  xHCI regression(mass storage devices fail) in stable 3.13.5(14.04)

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Released

Bug description:
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.252465] usb 3-2: reset SuperSpeed USB device number 2 using xhci_hcd
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.268395] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880046f75980
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.268400] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880046f759c0
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.540388] usb 3-2: reset SuperSpeed USB device number 2 using xhci_hcd
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.556687] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880046f75980
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.556693] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880046f759c0
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557393] sd 3:0:0:0: [sdb] Unhandled error code
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557399] sd 3:0:0:0: [sdb]
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557401] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557403] sd 3:0:0:0: [sdb] CDB:
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557405] Read(10): 28 00 00 00 35 a1 00 00 66 00
  Mar 11 02:00:25 u-ThinkPad-X240s kernel: [ 299.557415] end_request: I/O error, dev sdb, sector 13729

  
  http://www.spinics.net/lists/linux-usb/msg103757.html

  should backport:
  e2ed511400d41e0d136089d5a55ceab57c6a2426
  469d417b68958a064c09e7875646c97c6e783dfc

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