linux-kernel - [PATCH] usb: fix a few cases of -Wfallthrough

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Date:   Tue, 10 Nov 2020 17:47:14 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH] usb: fix a few cases of -Wfallthrough

The "fallthrough" pseudo-keyword was added as a portable way to denote
intentional fallthrough. Clang will still warn on cases where there is a
fallthrough to an immediate break. Add explicit breaks for those cases.

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 drivers/usb/core/config.c    | 1 +
 drivers/usb/host/ehci-hcd.c  | 2 +-
 drivers/usb/host/ohci-hcd.c  | 2 +-
 drivers/usb/host/ohci-hub.c  | 1 +
 drivers/usb/host/xhci-ring.c | 2 ++
 5 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 562a730befda..b199eb65f378 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -1076,6 +1076,7 @@ int usb_get_bos_descriptor(struct usb_device *dev)
 		case USB_PTM_CAP_TYPE:
 			dev->bos->ptm_cap =
 				(struct usb_ptm_cap_descriptor *)buffer;
+			break;
 		default:
 			break;
 		}
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 3575b7201881..e358ae17d51e 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -867,7 +867,7 @@ static int ehci_urb_enqueue (
 		 */
 		if (urb->transfer_buffer_length > (16 * 1024))
 			return -EMSGSIZE;
-		/* FALLTHROUGH */
+		fallthrough;
 	/* case PIPE_BULK: */
 	default:
 		if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 73e13e7c2b46..1f5e69314a17 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -171,7 +171,7 @@ static int ohci_urb_enqueue (
 
 			/* 1 TD for setup, 1 for ACK, plus ... */
 			size = 2;
-			/* FALLTHROUGH */
+			fallthrough;
 		// case PIPE_INTERRUPT:
 		// case PIPE_BULK:
 		default:
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 44504c1751e0..f474f2f9c1e4 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -692,6 +692,7 @@ int ohci_hub_control(
 		case C_HUB_OVER_CURRENT:
 			ohci_writel (ohci, RH_HS_OCIC,
 					&ohci->regs->roothub.status);
+			break;
 		case C_HUB_LOCAL_POWER:
 			break;
 		default:
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 167dae117f73..eac43a7b7f23 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2418,6 +2418,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 			xhci_warn_ratelimited(xhci,
 					      "WARN Successful completion on short TX for slot %u ep %u: needs XHCI_TRUST_TX_LENGTH quirk?\n",
 					      slot_id, ep_index);
+		break;
 	case COMP_SHORT_PACKET:
 		break;
 	/* Completion codes for endpoint stopped state */
@@ -2962,6 +2963,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
 		return -EINVAL;
 	case EP_STATE_HALTED:
 		xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n");
+		break;
 	case EP_STATE_STOPPED:
 	case EP_STATE_RUNNING:
 		break;
-- 
2.29.2.222.g5d2a92d10f8-goog