linux-kernel - [PATCH 2/2] rtc: ds1374: wdt: Fix stop/start ioctl always returning -EINVAL

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Date:   Mon, 24 Apr 2017 15:05:12 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     moritz.fischer@...us.com, linux-watchdog@...r.kernel.org,
        linux@...ck-us.net, wim@...ana.be, a.zummo@...ertech.it,
        alexandre.belloni@...e-electrons.com, rtc-linux@...glegroups.com,
        alex.williams@...com, Moritz Fischer <mdf@...nel.org>
Subject: [PATCH 2/2] rtc: ds1374: wdt: Fix stop/start ioctl always returning -EINVAL

Fix commit 920f91e50c5b ("drivers/rtc/rtc-ds1374.c: add watchdog support")

The WDIOC_SETOPTIONS case in the watchdog ioctl would alwayss falls
through to the -EINVAL case. This is wrong since thew watchdog does
actually get stopped or started correctly.

Signed-off-by: Moritz Fischer <mdf@...nel.org>
---
 drivers/rtc/rtc-ds1374.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 2a8b5b3..38a2e9e 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -546,14 +546,15 @@ static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
 		if (options & WDIOS_DISABLECARD) {
 			pr_info("disable watchdog\n");
 			ds1374_wdt_disable();
+			return 0;
 		}
 
 		if (options & WDIOS_ENABLECARD) {
 			pr_info("enable watchdog\n");
 			ds1374_wdt_settimeout(wdt_margin);
 			ds1374_wdt_ping();
+			return 0;
 		}
-
 		return -EINVAL;
 	}
 	return -ENOTTY;
-- 
2.7.4