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usbcore: store each usb_device's level in the tree

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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>
This commit is contained in:
Alan Stern 2006-08-30 15:46:48 -04:00 committed by Greg Kroah-Hartman
parent d1ad4ea331
commit b6956ffa59
2 changed files with 2 additions and 0 deletions
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1
drivers/usb/core/hub.c
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@ -2414,6 +2414,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
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);

1
include/linux/usb.h
View file

@ -348,6 +348,7 @@ struct usb_device {
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 */