linux-kernel - Re: [PATCH V3 net-next 2/8] net: hns3: Add support of the HNAE3 framework

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Date:   Sat, 17 Jun 2017 21:45:38 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     davem@...emloft.net, yisen.zhuang@...wei.com,
        huangdaode@...ilicon.com, lipeng321@...wei.com,
        mehta.salil.lnk@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH V3 net-next 2/8] net: hns3: Add support of the HNAE3
 framework

> +static void hnae3_list_add(spinlock_t *lock, struct list_head *node,
> +			   struct list_head *head)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(lock, flags);
> +	list_add_tail(node, head);
> +	spin_unlock_irqrestore(lock, flags);
> +}
> +
> +static void hnae3_list_del(spinlock_t *lock, struct list_head *node)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(lock, flags);
> +	list_del(node);
> +	spin_unlock_irqrestore(lock, flags);
> +}
> +

> +int hnae3_register_client(struct hnae3_client *client)
> +{
> +	struct hnae3_client *client_tmp;
> +	struct hnae3_ae_dev *ae_dev;
> +	int ret;
> +
> +	/* One system should only have one client for every type */
> +	list_for_each_entry(client_tmp, &hnae3_client_list, node) {
> +		if (client_tmp->type == client->type)
> +			return 0;
> +	}
> +
> +	hnae3_list_add(&hnae3_list_client_lock, &client->node,
> +		       &hnae3_client_list);

Please could you explain your locking scheme. I don't get it.

       Thanks
	Andrew