linux-kernel - [PATCH] watchdog: sbc60xxwdt: Mark expected switch fall-through

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Message-ID: <20190226175835.GA12199@embeddedor>
Date:   Tue, 26 Feb 2019 11:58:35 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] watchdog: sbc60xxwdt: Mark expected switch fall-through

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

This patch fixes the following warning:

drivers/watchdog/sbc60xxwdt.c: In function ‘fop_ioctl’:
drivers/watchdog/sbc60xxwdt.c:272:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   wdt_keepalive();
   ^~~~~~~~~~~~~~~
drivers/watchdog/sbc60xxwdt.c:275:2: note: here
  case WDIOC_GETTIMEOUT:
  ^~~~

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/watchdog/sbc60xxwdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/sbc60xxwdt.c b/drivers/watchdog/sbc60xxwdt.c
index 87333a41f753..72d15fd1f183 100644
--- a/drivers/watchdog/sbc60xxwdt.c
+++ b/drivers/watchdog/sbc60xxwdt.c
@@ -270,8 +270,8 @@ static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		timeout = new_timeout;
 		wdt_keepalive();
-		/* Fall through */
 	}
+		/* Fall through */
 	case WDIOC_GETTIMEOUT:
 		return put_user(timeout, p);
 	default:
-- 
2.20.1