From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Date: Tue, 23 Nov 2010 18:42:22 +0000 (-0800)
Subject: xhci: Limit roothub ports to 15 USB3 & 31 USB2 ports.
X-Git-Tag: v2.6.39-rc1~472^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d30b2a208108a0b0fdeae7006b8824d9be16ca96;p=pandora-kernel.git

xhci: Limit roothub ports to 15 USB3 & 31 USB2 ports.

The USB core allocates a USB 2.0 roothub descriptor that has room for 31
(USB_MAXCHILDREN) ports' worth of DeviceRemovable and PortPwrCtrlMask
fields.  Limit the number of USB 2.0 roothub ports accordingly.  I don't
expect to run into this limitation ever, but this prevents a buffer
overflow issue in the roothub descriptor filling code.

Similarly, a USB 3.0 hub can only have 15 downstream ports, so limit the
USB 3.0 roothub to 15 USB 3.0 ports.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
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