--- 275b21ecb1cd42ed597df98d17017f08392afac8/drivers/usb/class/cdc-acm.c  (mode:100644 sha1:6d1f9b6aecff7d68bb57b2a2b5a2274e4f3e624c)
+++ uncommitted/drivers/usb/class/cdc-acm.c  (mode:100644)
@@ -746,12 +746,12 @@
 
 	usb_fill_bulk_urb(acm->readurb, usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
 			  acm->read_buffer, readsize, acm_read_bulk, acm);
-	acm->readurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP;
+	acm->readurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 	acm->readurb->transfer_dma = acm->read_dma;
 
 	usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
 			  acm->write_buffer, acm->writesize, acm_write_bulk, acm);
-	acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP;
+	acm->writeurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 	acm->writeurb->transfer_dma = acm->write_dma;
 
 	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);