Index: fwdev.c
===================================================================
RCS file: /cvsroot/src/sys/dev/ieee1394/fwdev.c,v
retrieving revision 1.23
diff -u -p -r1.23 fwdev.c
--- fwdev.c	16 Aug 2010 06:05:07 -0000	1.23
+++ fwdev.c	22 Aug 2010 21:56:50 -0000
@@ -803,12 +803,18 @@ fw_read_async(struct fw_drv1 *d, struct 
 	int err = 0;
 
 	mutex_enter(&d->fc->fc_mtx);
-	while ((xfer = STAILQ_FIRST(&d->rq)) == NULL && err == 0)
-		err = tsleep(&d->rq, FWPRI, "fwra", 0);
 
-	if (err != 0) {
-		mutex_exit(&d->fc->fc_mtx);
-		return err;
+	for (;;) {
+		xfer = STAILQ_FIRST(&d->rq);
+		if (xfer == NULL && err == 0) {
+			mutex_exit(&d->fc->fc_mtx);
+			err = tsleep(&d->rq, FWPRI, "fwra", 0);
+			if (err != 0)
+				return err;
+			mutex_enter(&d->fc->fc_mtx);
+			continue;
+		}
+		break;
 	}
 
 	STAILQ_REMOVE_HEAD(&d->rq, link);