linux-kernel - [PATCH] USB: serial: io_edgeport: mark expected switch fall-throughs

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Message-ID: <20171027203906.GA7054@embeddedor.com>
Date:   Fri, 27 Oct 2017 15:39:06 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] USB: serial: io_edgeport: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in this particular case I replaced "...drop on through"
comments with a proper "fall through" comment on its own line, which
is what GCC is expecting to find.

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/usb/serial/io_edgeport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index bdf8bd8..8d96e12 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1759,7 +1759,7 @@ static void process_rcvd_data(struct edgeport_serial *edge_serial,
 				edge_serial->rxState = EXPECT_HDR2;
 				break;
 			}
-			/* otherwise, drop on through */
+			/* fall through */
 		case EXPECT_HDR2:
 			edge_serial->rxHeader2 = *buffer;
 			++buffer;
@@ -1819,8 +1819,8 @@ static void process_rcvd_data(struct edgeport_serial *edge_serial,
 					edge_serial->rxState = EXPECT_DATA;
 					break;
 				}
-				/* Else, drop through */
 			}
+			/* fall through */
 		case EXPECT_DATA: /* Expect data */
 			if (bufferLength < edge_serial->rxBytesRemaining) {
 				rxLen = bufferLength;
-- 
2.7.4