Netdev List

* Re: [PATCH 1/6] net: ethernet: ti: netcp: add support of cpts
From: Richard Cochran @ 2016-11-30  9:44 UTC (permalink / raw)
  To: Grygorii Strashko
  Cc: David S. Miller, netdev, Mugunthan V N, Sekhar Nori, linux-kernel,
	linux-omap, Rob Herring, devicetree, Murali Karicheri,
	Wingman Kwok
In-Reply-To: <20161128230428.6872-2-grygorii.strashko@ti.com>

On Mon, Nov 28, 2016 at 05:04:23PM -0600, Grygorii Strashko wrote:
> @@ -678,6 +744,9 @@ struct gbe_priv {
>  	int				num_et_stats;
>  	/*  Lock for updating the hwstats */
>  	spinlock_t			hw_stats_lock;
> +
> +	int                             cpts_registered;

The usage of this counter is racy.

> +	struct cpts                     *cpts;
>  };

This ++ and -- business ...

> +static void gbe_register_cpts(struct gbe_priv *gbe_dev)
> +{
> +	if (!gbe_dev->cpts)
> +		return;
> +
> +	if (gbe_dev->cpts_registered > 0)
> +		goto done;
> +
> +	if (cpts_register(gbe_dev->cpts)) {
> +		dev_err(gbe_dev->dev, "error registering cpts device\n");
> +		return;
> +	}
> +
> +done:
> +	++gbe_dev->cpts_registered;
> +}
> +
> +static void gbe_unregister_cpts(struct gbe_priv *gbe_dev)
> +{
> +	if (!gbe_dev->cpts || (gbe_dev->cpts_registered <= 0))
> +		return;
> +
> +	if (--gbe_dev->cpts_registered)
> +		return;
> +
> +	cpts_unregister(gbe_dev->cpts);
> +}

is invoked from your open() and close() methods, but those methods
are not serialized among multiple ports.

Thanks,
Richard

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