linux-kernel - [PATCH] mtd: spi-nor: mark desirable switch case fall through

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Date:   Fri, 9 Nov 2018 17:40:21 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...tlin.com>, <marek.vasut@...il.com>,
        <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <richard@....at>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <cyrille.pitchen@...ev4u.fr>, <Tudor.Ambarus@...rochip.com>
Subject: [PATCH] mtd: spi-nor: mark desirable switch case fall through

gcc 7 with -Wimplicit-fallthrough raises:

drivers/mtd/spi-nor/spi-nor.c: In function ‘set_4byte’:
drivers/mtd/spi-nor/spi-nor.c:289:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
   need_wren = true;
   ~~~~~~~~~~^~~~~~
drivers/mtd/spi-nor/spi-nor.c:290:2: note: here
  case SNOR_MFR_MACRONIX:
  ^~~~

Quiet the warning by marking the expected switch fall through.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 9407ca5f9443..8065d5d76be5 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -287,6 +287,7 @@ static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 	case SNOR_MFR_MICRON:
 		/* Some Micron need WREN command; all will accept it */
 		need_wren = true;
+		/* fall through */
 	case SNOR_MFR_MACRONIX:
 	case SNOR_MFR_WINBOND:
 		if (need_wren)
-- 
2.9.4