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USB: Make sure to fetch the BOS desc for roothubs. 

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@linux.intel.com>
Cc: Andiry Xu <andiry.xu@amd.com>
This commit is contained in:
Sarah Sharp 2012-05-15 16:58:45 -07:00
parent 797b0ca5e6
commit 448b6eb1e0
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/core/hcd.c
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@ -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) {