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

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Message-ID: <104c1190-cd18-d7c9-7b27-af367ac539bb@oss.nxp.com>
Date:   Fri, 7 Apr 2023 20:42:12 +0300
From:   "Radu Pirea (OSS)" <radu-nicolae.pirea@....nxp.com>
To:     Andrew Lunn <andrew@...n.ch>
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 07.04.2023 17:20, Andrew Lunn wrote:
> 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?
The MAC driver should call phy_disconnect() when it is removed. Also, 
the user should not be able to remove the PHY driver if is in uses.

Radu P.
> 
>     Andrew