netdev - Re: [net-next Patch v5 5/6] octeontx2-pf: Add support for HTB offload

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Date:   Tue, 28 Mar 2023 12:56:08 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Hariprasad Kelam <hkelam@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kuba@...nel.org, davem@...emloft.net,
        willemdebruijn.kernel@...il.com, andrew@...n.ch,
        sgoutham@...vell.com, lcherian@...vell.com, gakula@...vell.com,
        jerinj@...vell.com, sbhatta@...vell.com, naveenm@...vel.com,
        edumazet@...gle.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, maxtram95@...il.com
Subject: Re: [net-next Patch v5 5/6] octeontx2-pf: Add support for HTB
 offload

On Sun, 2023-03-26 at 23:42 +0530, Hariprasad Kelam wrote:
[...]
> +static int otx2_qos_root_add(struct otx2_nic *pfvf, u16 htb_maj_id, u16 htb_defcls,
> +			     struct netlink_ext_ack *extack)
> +{
> +	struct otx2_qos_cfg *new_cfg;
> +	struct otx2_qos_node *root;
> +	int err;
> +
> +	netdev_dbg(pfvf->netdev,
> +		   "TC_HTB_CREATE: handle=0x%x defcls=0x%x\n",
> +		   htb_maj_id, htb_defcls);
> +
> +	INIT_LIST_HEAD(&pfvf->qos.qos_tree);
> +	mutex_init(&pfvf->qos.qos_lock);

It's quite strange and error prone dynamically init this mutex and the
list here. Why don't you do such init ad device creation time?

> +
> +	root = otx2_qos_alloc_root(pfvf);
> +	if (IS_ERR(root)) {
> +		mutex_destroy(&pfvf->qos.qos_lock);
> +		err = PTR_ERR(root);
> +		return err;
> +	}
> +
> +	/* allocate txschq queue */
> +	new_cfg = kzalloc(sizeof(*new_cfg), GFP_KERNEL);
> +	if (!new_cfg) {
> +		NL_SET_ERR_MSG_MOD(extack, "Memory allocation error");

Here the root node is leaked.

> +		mutex_destroy(&pfvf->qos.qos_lock);
> +		return -ENOMEM;
> +	}


[...]

Cheers,

Paolo