linux-kernel - [PATCH 5/6] watchdog: atlas7_wdt: test clock rate to avoid division by 0

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Message-Id: <1456958018-7849-6-git-send-email-wsa@the-dreams.de>
Date:	Wed,  2 Mar 2016 23:33:36 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-renesas-soc@...r.kernel.org,
	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-watchdog@...r.kernel.org
Subject: [PATCH 5/6] watchdog: atlas7_wdt: test clock rate to avoid division by 0

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

The clk API may return 0 on clk_get_rate, so we should check the result before
using it as a divisor.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---

Should go individually via subsystem tree.

 drivers/watchdog/atlas7_wdt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
index df6d9242a31958..ed80734befae16 100644
--- a/drivers/watchdog/atlas7_wdt.c
+++ b/drivers/watchdog/atlas7_wdt.c
@@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
 	writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
 
 	wdt->tick_rate = clk_get_rate(clk);
+	if (!wdt->tick_rate) {
+		ret = -EINVAL;
+		goto err1;
+	}
+
 	wdt->clk = clk;
 	atlas7_wdd.min_timeout = 1;
 	atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
-- 
2.7.0