linux-kernel - [PATCH] net: spider_net: Mark expected switch fall-through

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Message-ID: <20190729003251.GA25556@embeddedor>
Date:   Sun, 28 Jul 2019 19:32:51 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] net: spider_net: Mark expected switch fall-through

Mark switch cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/net/ethernet/toshiba/spider_net.c: In function 'spider_net_release_tx_chain':
drivers/net/ethernet/toshiba/spider_net.c:783:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    if (!brutal) {
       ^
drivers/net/ethernet/toshiba/spider_net.c:792:3: note: here
   case SPIDER_NET_DESCR_RESPONSE_ERROR:
   ^~~~

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

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/net/ethernet/toshiba/spider_net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c
index 5b196ebfed49..0f346761a2b2 100644
--- a/drivers/net/ethernet/toshiba/spider_net.c
+++ b/drivers/net/ethernet/toshiba/spider_net.c
@@ -788,6 +788,7 @@ spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
 			/* fallthrough, if we release the descriptors
 			 * brutally (then we don't care about
 			 * SPIDER_NET_DESCR_CARDOWNED) */
+			/* Fall through */
 
 		case SPIDER_NET_DESCR_RESPONSE_ERROR:
 		case SPIDER_NET_DESCR_PROTECTION_ERROR:
-- 
2.22.0