linux-kernel - [PATCH 1/6] ide: palm_bk3710: test clock rate to avoid division by 0

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Message-Id: <1456958018-7849-2-git-send-email-wsa@the-dreams.de>
Date:	Wed,  2 Mar 2016 23:33:32 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-renesas-soc@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, linux-ide@...r.kernel.org
Subject: [PATCH 1/6] ide: palm_bk3710: 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/ide/palm_bk3710.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ide/palm_bk3710.c b/drivers/ide/palm_bk3710.c
index 8012e43bf8f618..46427ea01753b4 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;
-- 
2.7.0