linux-kernel - [PATCH 2/2] Fix implicit fallthrough warning

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Date:   Mon, 20 Feb 2017 22:51:24 +0200
From:   Jonathan Dieter <jdieter@...bg.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jonathan Dieter <jdieter@...bg.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Peter Senna Tschudin <peter.senna@...il.com>,
        linux-usb@...r.kernel.org (open list:USB OVER IP DRIVER)
Subject: [PATCH 2/2] Fix implicit fallthrough warning

GCC 7 now warns when switch statements fall through implicitly, and with
-Werror enabled in configure.ac, that makes these tools unbuildable.

We fix this by notifying the compiler that this particular case statement
is meant to fall through.

Reviewed-by: Peter Senna Tschudin <peter.senna@...il.com>
Signed-off-by: Jonathan Dieter <jdieter@...bg.com>
---
 tools/usb/usbip/src/usbip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/usb/usbip/src/usbip.c b/tools/usb/usbip/src/usbip.c
index d7599d9..73d8eee 100644
--- a/tools/usb/usbip/src/usbip.c
+++ b/tools/usb/usbip/src/usbip.c
@@ -176,6 +176,8 @@ int main(int argc, char *argv[])
 			break;
 		case '?':
 			printf("usbip: invalid option\n");
+			/* Terminate after printing error */
+			/* FALLTHRU */
 		default:
 			usbip_usage();
 			goto out;
-- 
2.9.3