netdev - Re: [PATCH] net: net_secret should not depend on TCP

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Date:	Tue, 24 Sep 2013 17:13:33 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>, davem@...emloft.net,
	netdev@...r.kernel.org, jesse.brandeburg@...el.com
Subject: Re: [PATCH] net: net_secret should not depend on TCP

On Tue, Sep 24, 2013 at 06:19:57AM -0700, Eric Dumazet wrote:
> -void net_secret_init(void)
> +static u32 net_secret[NET_SECRET_SIZE] ____cacheline_aligned;
> +
> +static void net_secret_init(void)
>  {
> -	get_random_bytes(net_secret, sizeof(net_secret));
> +	u32 tmp;
> +	int i;
> +
> +	if (likely(net_secret[0]))
> +		return;
> +
> +	for (i = NET_SECRET_SIZE; i > 0;) {
> +		do {
> +			get_random_bytes(&tmp, sizeof(tmp));
> +		} while (!tmp);

I am afraid we can block here on embedded systems in an atomic section? Is
this actually an issue? It does get called in a spin_lock_h.

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