commit a6809ffd upstream.

We want to give the command abortion an additional try to stop
the command ring before we completely hose xhci.
Tested-by: Vincent Pelletier <plr.vincent@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ luis: backported to 3.16:
  - xhci_handshake() has an extra 'xhci' parameter in 3.16 ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>