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net: ethernet: renesas: ravb_main: test clock rate to avoid division by 0

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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>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfram Sang 2016-04-08 13:28:42 +02:00 committed by David S. Miller
parent 60e19518d6
commit a6d37131c0
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/renesas/ravb_main.c
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@ -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);