linux-kernel - [PATCH] clocksource/drivers: fix uninitialized variable use in timer_of

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Date:   Wed, 21 Jun 2017 23:49:54 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] clocksource/drivers: fix uninitialized variable use in timer_of_init

If none of the flags are set, 'ret' is uninitialized as pointed out
by gcc:

drivers/clocksource/timer-of.c: In function 'timer_of_init':
drivers/clocksource/timer-of.c:160:9: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Since calling the function without any of the flags is an error,
set the return value to -EINVAL for that case.

Fixes: dc11bae78529 ("clocksource/drivers: Add timer-of common init routine")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/clocksource/timer-of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index be1dbee11c20..af75cbdcfc06 100644
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -130,7 +130,7 @@ static __init int timer_base_init(struct device_node *np,
 
 int __init timer_of_init(struct device_node *np, struct timer_of *to)
 {
-	int ret;
+	int ret = -EINVAL;
 	int flags = 0;
 
 	if (to->flags & TIMER_OF_BASE) {
-- 
2.9.0