From 448b6eb1e04cddc418d4b780ae19ca8cdb42d110 Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Tue, 15 May 2012 16:58:45 -0700 Subject: [PATCH] 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 Cc: Andiry Xu --- drivers/usb/core/hcd.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 0cd2daacacbe..190b1ec7bdcb 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) { -- 2.20.1