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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