Commit 0d5ff306 authored Jul 10, 2012 by Richard Kennedy Committed by Greg Kroah-Hartman Jul 16, 2012

USB: remove 8 bytes of padding from usb_host_interface on 64 bit builds



Reorder elements in the usb_host_interface structure to remove 8 bytes
of padding on 64 bit builds , and so shrink it's size to 40 bytes.

usb_interface_descriptor is a odd size which leaves a gap that is not
big enough to hold a pointer, so moving extralen into that gap removes
the need for more padding.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 09110529

include/linux/usb.h

+3 −2

Original line number	Diff line number	Diff line
		@@ -77,14 +77,15 @@ struct usb_host_endpoint {
		struct usb_host_interface {
		struct usb_interface_descriptor desc;

		int extralen;
		unsigned char extra; / Extra descriptors */

		/* array of desc.bNumEndpoint endpoints associated with this
		* interface setting. these will be in no particular order.
		*/
		struct usb_host_endpoint *endpoint;

		char string; / iInterface string, if present */
		unsigned char extra; / Extra descriptors */
		int extralen;
		};

		enum usb_interface_condition {