usb_disconnect() no longer acquires usb_bus_list_lock, so update its
comment to that effect.

Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
---
 drivers/usb/core/hub.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 558313d..087691b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2006,8 +2006,8 @@ static void hub_free_dev(struct usb_device *udev)
  * Something got disconnected. Get rid of it and all of its children.
  *
  * If *pdev is a normal device then the parent hub must already be locked.
- * If *pdev is a root hub then this routine will acquire the
- * usb_bus_list_lock on behalf of the caller.
+ * If *pdev is a root hub then the caller must hold the usb_bus_list_lock,
+ * which protects the set of root hubs as well as the list of buses.
  *
  * Only hub drivers (including virtual root hub drivers for host
  * controllers) should ever call this.

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