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From: Kalle Valo <kvalo@kernel.org>
To: Kang Yang <quic_kangyang@quicinc.com>
Cc: <ath12k@lists.infradead.org>,  <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH v6 05/11] wifi: ath12k: implement handling of P2P NoA event
References: <20240130040303.370590-1-quic_kangyang@quicinc.com>
	<20240130040303.370590-6-quic_kangyang@quicinc.com>
Date: Tue, 06 Feb 2024 18:11:38 +0200
In-Reply-To: <20240130040303.370590-6-quic_kangyang@quicinc.com> (Kang Yang's
	message of "Tue, 30 Jan 2024 12:02:57 +0800")
Message-ID: <87plx9r2rp.fsf@kernel.org>
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Kang Yang <quic_kangyang@quicinc.com> writes:

> The NoA(Notice of Absence) attribute is used by the P2P Group Owner to
> signal its absence due to power save timing, concurrent operation, or
> off-channel scanning. It is also used in the P2P Presence Request-Response
> mechanism.
>
> The NoA attribute shall be present in the P2P IE in the beacon frames
> transmitted by a P2P Group Owner when a NoA schedule is being advertised,
> or when the CTWindow is non-zero.
>
> So add support to update P2P information after P2P GO is up through
> event WMI_P2P_NOA_EVENTID, and always put it in probe resp.
>
> Create p2p.c and p2p.h for P2P related functions and definitions.
>
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Kang Yang <quic_kangyang@quicinc.com>

[...]

> +static int ath12k_wmi_p2p_noa_event(struct ath12k_base *ab,
> +				    struct sk_buff *skb)
> +{
> +	const void **tb;
> +	const struct wmi_p2p_noa_event *ev;
> +	const struct ath12k_wmi_p2p_noa_info *noa;
> +	struct ath12k *ar;
> +	int ret, vdev_id;
> +
> +	tb = ath12k_wmi_tlv_parse_alloc(ab, skb, GFP_ATOMIC);
> +	if (IS_ERR(tb)) {
> +		ret = PTR_ERR(tb);
> +		ath12k_warn(ab, "failed to parse tlv: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ev = tb[WMI_TAG_P2P_NOA_EVENT];
> +	noa = tb[WMI_TAG_P2P_NOA_INFO];
> +
> +	if (!ev || !noa) {
> +		kfree(tb);
> +		return -EPROTO;
> +	}
> +
> +	vdev_id = __le32_to_cpu(ev->vdev_id);
> +
> +	ath12k_dbg(ab, ATH12K_DBG_WMI,
> +		   "wmi tlv p2p noa vdev_id %i descriptors %u\n",
> +		   vdev_id, le32_get_bits(noa->noa_attr, WMI_P2P_NOA_INFO_DESC_NUM));
> +	ar = ath12k_mac_get_ar_by_vdev_id(ab, vdev_id);
> +	if (!ar) {
> +		ath12k_warn(ab, "invalid vdev id %d in P2P NoA event\n",
> +			    vdev_id);
> +		return -EINVAL;
> +	}

Aren't we leaking tb here? In this function I revamped the error
handling to use the out label to make sure we are freeing tb in every
error. Please review:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=12e182b47078a48169e873c51d438d7417e7e0c8

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