Re: [PATCH] watchdog: smsc37b787_wdt: Mark expected switch fall-through

From: Guenter Roeck
Date: Mon Feb 18 2019 - 11:08:16 EST


On 2/14/19 12:16 PM, Gustavo A. R. Silva wrote:
In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/watchdog/smsc37b787_wdt.c: In function âwb_smsc_wdt_ioctlâ:
drivers/watchdog/smsc37b787_wdt.c:480:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
wb_smsc_wdt_set_timeout(timeout);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/watchdog/smsc37b787_wdt.c:482:2: note: here
case WDIOC_GETTIMEOUT:
^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

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@xxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

---
drivers/watchdog/smsc37b787_wdt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
index 445ea1ad1fa9..c768dcd53034 100644
--- a/drivers/watchdog/smsc37b787_wdt.c
+++ b/drivers/watchdog/smsc37b787_wdt.c
@@ -478,7 +478,7 @@ static long wb_smsc_wdt_ioctl(struct file *file,
return -EINVAL;
timeout = new_timeout;
wb_smsc_wdt_set_timeout(timeout);
- /* fall through and return the new timeout... */
+ /* fall through - and return the new timeout... */
case WDIOC_GETTIMEOUT:
new_timeout = timeout;
if (unit == UNIT_MINUTE)