usbcore: store each usb_device's level in the tree
This patch (as778) adds a field to struct usb_device to store the
device's level in the USB tree. In itself this number isn't really
important. But the overhead is very low, and in a later patch it will
be used for preventing bogus warnings from the lockdep checker.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index f5adce0..78e910b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2414,6 +2414,7 @@
usb_set_device_state(udev, USB_STATE_POWERED);
udev->speed = USB_SPEED_UNKNOWN;
udev->bus_mA = hub->mA_per_port;
+ udev->level = hdev->level + 1;
/* set the address */
choose_address(udev);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index c663032..df5c93e 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -348,6 +348,7 @@
unsigned short bus_mA; /* Current available from the bus */
u8 portnum; /* Parent port number (origin 1) */
+ u8 level; /* Number of USB hub ancestors */
int have_langid; /* whether string_langid is valid */
int string_langid; /* language ID for strings */