[PATCH 4.16 170/272] watchdog: sprd_wdt: Fix error handling in sprd_wdt_enable()

[Greg Kroah-Hartman]

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>

[ Upstream commit 3c578cd4bc52b6e65d65be1abad9a8aa489ec207 ]

If clk_prepare_enable(wdt->rtc_enable) fails,
wdt->enable clock is left enabled.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/watchdog/sprd_wdt.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/watchdog/sprd_wdt.c
+++ b/drivers/watchdog/sprd_wdt.c
@@ -154,8 +154,10 @@ static int sprd_wdt_enable(struct sprd_w
 	if (ret)
 		return ret;
 	ret = clk_prepare_enable(wdt->rtc_enable);
-	if (ret)
+	if (ret) {
+		clk_disable_unprepare(wdt->enable);
 		return ret;
+	}
 
 	sprd_wdt_unlock(wdt->base);
 	val = readl_relaxed(wdt->base + SPRD_WDT_CTRL);