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

[Wolfram Sang]

From: Wolfram Sang <wsa+rene...@sang-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+rene...@sang-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