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Commit b6956ffa authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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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: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d1ad4ea3

drivers/usb/core/hub.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/usb.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */