PERFORCE change 150166 for review

[Hans Petter Selasky]

http://perforce.freebsd.org/chv.cgi?CH=150166

Change 150166 by hselasky at hselasky_laptop001 on 2008/09/20 12:58:11

	
	Fix incorrect locking. The code path where the incorrect 
	locking exists is currently not used.

Affected files ...

.. //depot/projects/usb/src/sys/dev/usb2/core/usb2_busdma.c#6 edit

Differences ...

==== //depot/projects/usb/src/sys/dev/usb2/core/usb2_busdma.c#6 (text+ko) ====

@@ -614,7 +614,6 @@
 			/*
 			 * Try to load memory into DMA.
 			 */
-			mtx_lock(uptag->mtx);
 			err = bus_dmamap_load(
 			    pc->tag, pc->map, pc->buffer, size,
 			    &usb2_pc_alloc_mem_cb, pc, BUS_DMA_WAITOK);
@@ -622,8 +621,6 @@
 				usb2_cv_wait(uptag->cv, uptag->mtx);
 				err = 0;
 			}
-			mtx_unlock(uptag->mtx);
-
 			if (err || uptag->dma_error) {
 				return (1);
 			}