usb: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break/return/fallthrough
statements instead of letting the code fall through to the next
case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/a76da7ca5b4f41c13d27b298accb8222d0b04e61.1605896060.git.gustavoars@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/function/f_fs.c

@@ -678,6 +678,8 @@ static __poll_t ffs_ep0_poll(struct file *file, poll_table *wait)
 			mask |= (EPOLLIN | EPOLLOUT);
 			break;
 		}
+		break;
+
 	case FFS_CLOSING:
 		break;
 	case FFS_DEACTIVATED:

drivers/usb/gadget/function/f_loopback.c

@@ -274,7 +274,7 @@ static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
 	default:
 		ERROR(cdev, "%s loop complete --> %d, %d/%d\n", ep->name,
 				status, req->actual, req->length);
-		/* FALLTHROUGH */
+		fallthrough;
 
 	/* NOTE:  since this driver doesn't maintain an explicit record
 	 * of requests it submitted (just maintains qlen count), we

drivers/usb/gadget/function/f_sourcesink.c

@@ -559,6 +559,7 @@ static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
 #if 1
 		DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
 				status, req->actual, req->length);
+		break;
 #endif
 	case -EREMOTEIO:		/* short read */
 		break;

drivers/usb/gadget/udc/dummy_hcd.c

@@ -553,6 +553,7 @@ static int dummy_enable(struct usb_ep *_ep,
 				/* we'll fake any legal size */
 				break;
 			/* save a return statement */
+			fallthrough;
 		default:
 			goto done;
 		}
@@ -595,6 +596,7 @@ static int dummy_enable(struct usb_ep *_ep,
 			if (max <= 1023)
 				break;
 			/* save a return statement */
+			fallthrough;
 		default:
 			goto done;
 		}

drivers/usb/host/fotg210-hcd.c

@@ -5276,7 +5276,7 @@ static int fotg210_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 		 */
 		if (urb->transfer_buffer_length > (16 * 1024))
 			return -EMSGSIZE;
-		/* FALLTHROUGH */
+		fallthrough;
 	/* case PIPE_BULK: */
 	default:
 		if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))

drivers/usb/host/isp116x-hcd.c

@@ -1447,6 +1447,7 @@ static int isp116x_bus_resume(struct usb_hcd *hcd)
 		val &= ~HCCONTROL_HCFS;
 		val |= HCCONTROL_USB_RESUME;
 		isp116x_write_reg32(isp116x, HCCONTROL, val);
+		break;
 	case HCCONTROL_USB_RESUME:
 		break;
 	case HCCONTROL_USB_OPER:

drivers/usb/host/max3421-hcd.c

@@ -1537,6 +1537,7 @@ max3421_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
 				__func__, urb->interval);
 			return -EINVAL;
 		}
+		break;
 	default:
 		break;
 	}

drivers/usb/host/oxu210hp-hcd.c

@@ -1365,6 +1365,7 @@ __acquires(oxu->lock)
 	switch (urb->status) {
 	case -EINPROGRESS:		/* success */
 		urb->status = 0;
+		break;
 	default:			/* fault */
 		break;
 	case -EREMOTEIO:		/* fault or normal */

drivers/usb/misc/yurex.c

@@ -137,6 +137,7 @@ static void yurex_interrupt(struct urb *urb)
 		dev_err(&dev->interface->dev,
 			"%s - overflow with length %d, actual length is %d\n",
 			__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
+		return;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:

drivers/usb/musb/tusb6010.c

@@ -467,6 +467,7 @@ static void musb_do_idle(struct timer_list *t)
 		fallthrough;
 	case OTG_STATE_A_IDLE:
 		tusb_musb_set_vbus(musb, 0);
+		break;
 	default:
 		break;
 	}

drivers/usb/storage/ene_ub6250.c

@@ -861,6 +861,7 @@ static int ms_count_freeblock(struct us_data *us, u16 PhyBlock)
 		case MS_LB_NOT_USED:
 		case MS_LB_NOT_USED_ERASED:
 			Count++;
+			break;
 		default:
 			break;
 		}

drivers/usb/storage/uas.c

@@ -690,6 +690,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 		fallthrough;
 	case DMA_TO_DEVICE:
 		cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
+		break;
 	case DMA_NONE:
 		break;
 	}