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Subject: Re: [RESEND net-next 1/2] net: hns3: add support for PTP
To:     Richard Cochran <richardcochran@gmail.com>
CC:     <davem@davemloft.net>, <kuba@kernel.org>, <netdev@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <salil.mehta@huawei.com>,
        <lipeng321@huawei.com>, <tanhuazhong@huawei.com>
References: <1622602664-20274-1-git-send-email-huangguangbin2@huawei.com>
 <1622602664-20274-2-git-send-email-huangguangbin2@huawei.com>
 <20210603131846.GB6216@hoboy.vegasvil.org>
From:   "huangguangbin (A)" <huangguangbin2@huawei.com>
Message-ID: <9dd4b064-216d-7bef-2399-aa2b2b0d170f@huawei.com>
Date:   Sat, 5 Jun 2021 17:57:02 +0800
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On 2021/6/3 21:18, Richard Cochran wrote:
> On Wed, Jun 02, 2021 at 10:57:43AM +0800, Guangbin Huang wrote:
> 
>> +static int hclge_ptp_create_clock(struct hclge_dev *hdev)
>> +{
>> +#define HCLGE_PTP_NAME_LEN	32
>> +
>> +	struct hclge_ptp *ptp;
>> +
>> +	ptp = devm_kzalloc(&hdev->pdev->dev, sizeof(*ptp), GFP_KERNEL);
>> +	if (!ptp)
>> +		return -ENOMEM;
>> +
>> +	ptp->hdev = hdev;
>> +	snprintf(ptp->info.name, HCLGE_PTP_NAME_LEN, "%s",
>> +		 HCLGE_DRIVER_NAME);
>> +	ptp->info.owner = THIS_MODULE;
>> +	ptp->info.max_adj = HCLGE_PTP_CYCLE_ADJ_MAX;
>> +	ptp->info.n_ext_ts = 0;
>> +	ptp->info.pps = 0;
>> +	ptp->info.adjfreq = hclge_ptp_adjfreq;
>> +	ptp->info.adjtime = hclge_ptp_adjtime;
>> +	ptp->info.gettimex64 = hclge_ptp_gettimex;
>> +	ptp->info.settime64 = hclge_ptp_settime;
>> +
>> +	ptp->info.n_alarm = 0;
>> +	ptp->clock = ptp_clock_register(&ptp->info, &hdev->pdev->dev);
>> +	if (IS_ERR(ptp->clock)) {
>> +		dev_err(&hdev->pdev->dev, "%d failed to register ptp clock, ret = %ld\n",
>> +			ptp->info.n_alarm, PTR_ERR(ptp->clock));
>> +		return PTR_ERR(ptp->clock);
>> +	}
> 
> You must handle the case where NULL is returned.
> 
>   * ptp_clock_register() - register a PTP hardware clock driver
>   *
>   * @info:   Structure describing the new clock.
>   * @parent: Pointer to the parent device of the new clock.
>   *
>   * Returns a valid pointer on success or PTR_ERR on failure.  If PHC
>   * support is missing at the configuration level, this function
>   * returns NULL, and drivers are expected to gracefully handle that
>   * case separately.
> 
Ok, thank you.


>> +
>> +	ptp->io_base = hdev->hw.io_base + HCLGE_PTP_REG_OFFSET;
>> +	ptp->ts_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
>> +	ptp->ts_cfg.tx_type = HWTSTAMP_TX_OFF;
>> +	hdev->ptp = ptp;
>> +
>> +	return 0;
>> +}
> 
> Thanks,
> Richard
> .
>