[RFC 02/13] USB: Make sure to fetch the BOS desc for roothubs.

[Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>]

The BOS descriptor is normally fetched and stored in the usb_device->bos
during enumeration.  USB 3.0 roothubs don't undergo enumeration, but we
need them to have a BOS descriptor, since each xHCI host has a different
U1 and U2 exit latency.  Make sure to fetch the BOS descriptor for USB
3.0 roothubs.  It will be freed when the roothub usb_device is released.

Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
---
 drivers/usb/core/hcd.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 0cd2daa..7910681 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -997,6 +997,15 @@ static int register_root_hub(struct usb_hcd *hcd)
 				dev_name(&usb_dev->dev), retval);
 		return (retval < 0) ? retval : -EMSGSIZE;
 	}
+	if (usb_dev->speed == USB_SPEED_SUPER) {
+		retval = usb_get_bos_descriptor(usb_dev);
+		if (retval > 0) {
+			mutex_unlock(&usb_bus_list_lock);
+			dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
+					dev_name(&usb_dev->dev), retval);
+			return retval;
+		}
+	}
 
 	retval = usb_new_device (usb_dev);
 	if (retval) {
-- 
1.7.9

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