linux-hardening - [PATCH 027/141] drbd: Fix fall-through warnings for Clang

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Date:   Fri, 20 Nov 2020 12:28:06 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH 027/141] drbd: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix a couple
of warnings by explicitly adding a break statement instead of just
letting the code fall through to the next, and by adding a fallthrough
pseudo-keyword in places whre the code is intended to fall through.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/block/drbd/drbd_receiver.c | 1 +
 drivers/block/drbd/drbd_req.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index dc333dbe5232..c19bb74ac935 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -5863,6 +5863,7 @@ static int got_NegRSDReply(struct drbd_connection *connection, struct packet_inf
 		switch (pi->cmd) {
 		case P_NEG_RS_DREPLY:
 			drbd_rs_failed_io(device, sector, size);
+			break;
 		case P_RS_CANCEL:
 			break;
 		default:
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 330f851cb8f0..9f212a923a3c 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -750,6 +750,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
 
 	case WRITE_ACKED_BY_PEER_AND_SIS:
 		req->rq_state |= RQ_NET_SIS;
+		fallthrough;
 	case WRITE_ACKED_BY_PEER:
 		/* Normal operation protocol C: successfully written on peer.
 		 * During resync, even in protocol != C,
-- 
2.27.0