From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 21 May 2014 01:08:33 +0000 (-0700)
Subject: usb: assign usb3 external hub port peers
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~34^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b1ba80c59fb3e77f9e1761480617d5ea9ee159c;p=pandora-kernel.git

usb: assign usb3 external hub port peers

Given that root hub port peers are already established, external hub peer
ports can be determined by traversing the device topology:

1/ ascend to the parent hub and find the upstream port_dev

2/ walk ->peer to find the peer port

3/ descend to the peer hub via ->child

4/ find the port with the matching port id

Note that this assumes the port labeling scheme required by the
specification [1].

[1]: usb3 3.1 section 10.3.3

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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