--- src/sys/dev/disk/nata/ata-queue.c	2007/06/01 00:31:15	1.5
+++ src/sys/dev/disk/nata/ata-queue.c	2007/06/03 11:52:09	1.6
@@ -77,6 +77,8 @@ ata_queue_request(struct ata_request *re
 	    spin_unlock_wr(&ch->state_mtx);
 	    return;
 	}
+	/* interlock against interrupt */
+	request->flags |= ATA_R_HWCMDQUEUED;
 	spin_unlock_wr(&ch->state_mtx);
     }
     /* otherwise put request on the locked queue at the specified location */
@@ -218,6 +220,10 @@ ata_start(device_t dev)
 		    ata_finish(request);
 		    return;
 		}
+
+		/* interlock against interrupt */
+		request->flags |= ATA_R_HWCMDQUEUED;
+
 		if (dumping) {
 		    spin_unlock_wr(&ch->state_mtx);
 		    spin_unlock_wr(&ch->queue_mtx);