linux-kernel - Re: [PATCH net] net: phy: nxp-c45-tja11xx: add remove callback

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Message-ID: <cf1dd1a9-2e2d-473e-89f0-8e2c51226dfe@lunn.ch>
Date:   Fri, 7 Apr 2023 16:20:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Radu Pirea (OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH net] net: phy: nxp-c45-tja11xx: add remove callback

On Thu, Apr 06, 2023 at 12:59:04PM +0300, Radu Pirea (OSS) wrote:
> Unregister PTP clock when the driver is removed.
> Purge the RX and TX skb queues.
> 
> Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support")
> CC: stable@...r.kernel.org # 5.15+
> Signed-off-by: Radu Pirea (OSS) <radu-nicolae.pirea@....nxp.com>
> ---
>  drivers/net/phy/nxp-c45-tja11xx.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c
> index 5813b07242ce..27738d1ae9ea 100644
> --- a/drivers/net/phy/nxp-c45-tja11xx.c
> +++ b/drivers/net/phy/nxp-c45-tja11xx.c
> @@ -1337,6 +1337,17 @@ static int nxp_c45_probe(struct phy_device *phydev)
>  	return ret;
>  }
>  
> +static void nxp_c45_remove(struct phy_device *phydev)
> +{
> +	struct nxp_c45_phy *priv = phydev->priv;
> +
> +	if (priv->ptp_clock)
> +		ptp_clock_unregister(priv->ptp_clock);
> +
> +	skb_queue_purge(&priv->tx_queue);
> +	skb_queue_purge(&priv->rx_queue);

Do you need to disable interrupts? I suppose the real question is, is
it guaranteed phy_disconnect() is called before the driver is removed?

   Andrew