2018-03-08 21:23:23

by Alexey Khoroshilov

Subject: [PATCH] watchdog: sprd_wdt: Fix error handling in sprd_wdt_enable()

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 <[email protected]>
---
drivers/watchdog/sprd_wdt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/sprd_wdt.c b/drivers/watchdog/sprd_wdt.c
index a8b280ff33e0..b4d484a42b70 100644
--- a/drivers/watchdog/sprd_wdt.c
+++ b/drivers/watchdog/sprd_wdt.c
@@ -154,8 +154,10 @@ static int sprd_wdt_enable(struct sprd_wdt *wdt)
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);
--
2.7.4

2018-03-08 21:44:10

by Guenter Roeck

Subject: Re: [PATCH] watchdog: sprd_wdt: Fix error handling in sprd_wdt_enable()

On Fri, Mar 09, 2018 at 12:21:48AM +0300, Alexey Khoroshilov wrote:
> 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 <[email protected]>

Reviewed-by: Guenter Roeck <[email protected]>

> ---
> drivers/watchdog/sprd_wdt.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/sprd_wdt.c b/drivers/watchdog/sprd_wdt.c
> index a8b280ff33e0..b4d484a42b70 100644
> --- a/drivers/watchdog/sprd_wdt.c
> +++ b/drivers/watchdog/sprd_wdt.c
> @@ -154,8 +154,10 @@ static int sprd_wdt_enable(struct sprd_wdt *wdt)
> 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);
> --
> 2.7.4
>