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> Cc: Andiry Xu <andiry.xu@xxxxxxx> --- 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..190b1ec 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html