Re: [PATCH v6 05/11] wifi: ath12k: implement handling of P2P NoA event

[Kalle Valo <kvalo@kernel.org>]

Kalle Valo <kvalo@kernel.org> writes:

> 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

I realised that ret was uninitialised when no error, new version:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=43f3069f6580b8a67969a6f32377d35aa7dd8d9a

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