netdev - Re: [PATCH v2] drop_monitor: convert to modular building

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Date:	Thu, 17 May 2012 19:14:05 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v2] drop_monitor: convert to modular building

On Thu, 2012-05-17 at 13:49 -0400, Neil Horman wrote:
> When I first wrote drop monitor I wrote it to just build monolithically.  There
> is no reason it can't be built modularly as well, so lets give it that
> flexibiity.
> 
> I've tested this by building it as both a module and monolithically, and it
> seems to work quite well
> 
> Change notes:
> 
> v2)
> * fixed for_each_present_cpu loops to be more correct as per Eric D.
> * Converted exit path failures to BUG_ON as per Ben H.

Sorry I didn't pick up on this the first time:

[...]
> -late_initcall(init_net_drop_monitor);
> +static void exit_net_drop_monitor(void)
> +{
> +	struct per_cpu_dm_data *data;
> +	int cpu;
> +
> +	BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier));
> +
> +	/*
> +	 * Because of the module_get/put we do in the trace state change path
> +	 * we are guarnateed not to have any current users when we get here
> +	 * all we need to do is make sure that we don't have any running timers
> +	 * or pending schedule calls
> +	 */
> +
> +	for_each_possible_cpu(cpu) {
> +		data = &per_cpu(dm_cpu_data, cpu);
> +		del_timer(&data->send_timer);

Doesn't this need to be del_timer_sync()?

Ben.

> +		cancel_work_sync(&data->dm_alert_work);
> +		/*
> +		 * At this point, we should have exclusive access
> +		 * to this struct and can free the skb inside it
> +		 */
> +		kfree_skb(data->skb);
> +	}
> +
> +	BUG_ON(genl_unregister_family(&net_drop_monitor_family));
> +}
> +
> +module_init(init_net_drop_monitor);
> +module_exit(exit_net_drop_monitor);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Neil Horman <nhorman@...driver.com>");

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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