From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Wed, 2 Mar 2016 22:33:32 +0000 (+0100)
Subject: ide: palm_bk3710: test clock rate to avoid division by 0
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0d7ef45cdeebcc95d581703f45f6de7b2ee89b8d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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

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@sang-engineering.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/ide/palm_bk3710.c b/drivers/ide/palm_bk3710.c
index 8012e43bf8f6..46427ea01753 100644
--- 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;