linux-kernel - Re: [PATCH 4/4] net/core/dev.c : Race condition in net_tx

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Date:	Wed, 25 Feb 2015 13:47:43 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ameenali023@...il.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] net/core/dev.c : Race condition in net_tx_action.

From: Ameen Ali <ameenali023@...il.com>
Date: Wed, 25 Feb 2015 19:50:59 +0200

> @@ -3413,7 +3413,7 @@ EXPORT_SYMBOL(netif_rx_ni);
>  
>  static void net_tx_action(struct softirq_action *h)
>  {
> -	struct softnet_data *sd = this_cpu_ptr(&softnet_data);
> +	volatile struct softnet_data *sd = &__get_cpu_var(softnet_data);

volatile is never an appropriate solution to a race condition
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