PERFORCE change 132644 for review

[Hans Petter Selasky]

http://perforce.freebsd.org/chv.cgi?CH=132644

Change 132644 by hselasky at hselasky_laptop001 on 2008/01/06 22:02:58

	
	Improve alternate setting. Add some more debug prints.

Affected files ...

.. //depot/projects/usb/src/sys/dev/usb/usb_transfer.c#99 edit

Differences ...

==== //depot/projects/usb/src/sys/dev/usb/usb_transfer.c#99 (text+ko) ====

@@ -3368,20 +3368,22 @@
 			}
 			if (iface->alt_index == req.wValue[0]) {
 				/* no change - nothing to do */
+				PRINTFN(0, ("alt setting no change\n"));
 				break;
 			}
-			error = device_detach(iface->subdev);
-			if (error) {
-				goto tr_stalled;
-			}
+			usbd_detach_device(udev, req.wIndex[0], 1);
+
 			error = usbd_set_alt_interface_index(udev,
 			    req.wIndex[0], req.wValue[0]);
 			if (error) {
+				PRINTFN(0, ("alt setting failed %s\n",
+				    usbd_errstr(error)));
 				goto tr_stalled;
 			}
 			error = usbd_probe_and_attach(udev,
 			    req.wIndex[0]);
 			if (error) {
+				PRINTFN(0, ("alt setting probe failed\n"));
 				goto tr_stalled;
 			}
 			break;