ide: palm_bk3710: test clock rate to avoid division by 0

Wolfram Sang · davem330 · commit 0d7ef45cdeeb · 2016-03-20T16:59:27.000-04:00
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 &lt;wsa+renesas@sang-engineering.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/ide/palm_bk3710.c b/drivers/ide/palm_bk3710.c
@@ -325,6 +325,8 @@ static int __init palm_bk3710_probe(struct platform_device *pdev)
 
 	clk_enable(clk);
 	rate = clk_get_rate(clk);
+	if (!rate)
+		return -EINVAL;
 
 	/* NOTE:  round *down* to meet minimum timings; we count in clocks */
 	ideclk_period = 1000000000UL / rate;
