Re: [RESEND net-next 1/2] net: hns3: add support for PTP

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.

+
+	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