linux-kernel - Re: [PATCH net-next v7 2/5] net: phy: microchip_rds_ptp : Add rds ptp library for Microchip phys

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Message-ID: <20241217192246.47868890@kernel.org>
Date: Tue, 17 Dec 2024 19:22:46 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Divya Koppera <divya.koppera@...rochip.com>
Cc: <andrew@...n.ch>, <arun.ramadoss@...rochip.com>,
 <UNGLinuxDriver@...rochip.com>, <hkallweit1@...il.com>,
 <linux@...linux.org.uk>, <davem@...emloft.net>, <edumazet@...gle.com>,
 <pabeni@...hat.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <richardcochran@...il.com>,
 <vadim.fedorenko@...ux.dev>
Subject: Re: [PATCH net-next v7 2/5] net: phy: microchip_rds_ptp : Add rds
 ptp library for Microchip phys

On Fri, 13 Dec 2024 17:44:00 +0530 Divya Koppera wrote:
> +
> +static int mchp_rds_ptp_ts_info(struct mii_timestamper *mii_ts,
> +				struct kernel_ethtool_ts_info *info)
> +{
> +	struct mchp_rds_ptp_clock *clock = container_of(mii_ts,
> +						      struct mchp_rds_ptp_clock,
> +						      mii_ts);
> +
> +	info->phc_index =
> +		clock->ptp_clock ? ptp_clock_index(clock->ptp_clock) : -1;

under what condition can the clock be NULL?

> +	if (info->phc_index == -1)
> +		return 0;