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

Greg Kroah-Hartman
2018-05-28T11:11:50Z

From: Alexey Khoroshilov <khoroshilov@ispras.ru>

[ 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@ispras.ru>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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);