linux-kernel - Re: [PATCH 2/6] net: ethernet: renesas: ravb_main: test clock rate to avoid division by 0

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Message-ID: <20160403213641.GA24129@katana>
Date:	Sun, 3 Apr 2016 23:36:41 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-renesas-soc@...r.kernel.org,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/6] net: ethernet: renesas: ravb_main: test clock rate
 to avoid division by 0

On Wed, Mar 02, 2016 at 11:33:33PM +0100, Wolfram Sang wrote:
> 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>

Ping.

> ---
> 
> 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
> 
> 

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