From: Wolfram Sang <wsa@the-dreams.de>
To: linux-kernel@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
netdev@vger.kernel.org
Subject: [PATCH 2/6] net: ethernet: renesas: ravb_main: test clock rate to avoid division by 0
Date: Wed, 2 Mar 2016 23:33:33 +0100 [thread overview]
Message-ID: <1456958018-7849-3-git-send-email-wsa@the-dreams.de> (raw)
In-Reply-To: <1456958018-7849-1-git-send-email-wsa@the-dreams.de>
From: Wolfram Sang <wsa+renesas@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+renesas@sang-engineering.com>
---
Should go individually via subsystem tree.
drivers/net/ethernet/renesas/ravb_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 88656ceb6e2946..ce1954a6a12726 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1691,6 +1691,9 @@ static int ravb_set_gti(struct net_device *ndev)
rate = clk_get_rate(clk);
clk_put(clk);
+ if (!rate)
+ return -EINVAL;
+
inc = 1000000000ULL << 20;
do_div(inc, rate);
--
2.7.0
next prev parent reply other threads:[~2016-03-02 22:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 22:33 [PATCH 0/6] treewide: test clock rate to avoid division by 0 Wolfram Sang
2016-03-02 22:33 ` Wolfram Sang [this message]
2016-03-03 11:14 ` [PATCH 2/6] net: ethernet: renesas: ravb_main: " Sergei Shtylyov
2016-04-03 21:36 ` Wolfram Sang
2016-04-03 22:28 ` Sergei Shtylyov
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