netdev - Re: [PATCH v1 1/9] can: af_can: export can_sock

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Date:   Tue, 12 Nov 2019 12:39:27 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     dev.kurt@...dijck-laurijssen.be, wg@...ndegger.com,
        netdev@...r.kernel.org, kernel@...gutronix.de,
        linux-can@...r.kernel.org
Subject: Re: [PATCH v1 1/9] can: af_can: export can_sock_destruct()

On 11/12/19 12:37 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Nov 12, 2019 at 12:15:52PM +0100, Oleksij Rempel wrote:
>> In j1939 we need our own struct sock::sk_destruct callback. Export the
>> generic af_can can_sock_destruct() that allows us to chain-call it.
>>
>> Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
>> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
>> ---
>>  include/linux/can/core.h | 1 +
>>  net/can/af_can.c         | 3 ++-
>>  2 files changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/can/core.h b/include/linux/can/core.h
>> index 8339071ab08b..e20a0cd09ba5 100644
>> --- a/include/linux/can/core.h
>> +++ b/include/linux/can/core.h
>> @@ -65,5 +65,6 @@ extern void can_rx_unregister(struct net *net, struct net_device *dev,
>>  			      void *data);
>>  
>>  extern int can_send(struct sk_buff *skb, int loop);
>> +void can_sock_destruct(struct sock *sk);
>>  
>>  #endif /* !_CAN_CORE_H */
>> diff --git a/net/can/af_can.c b/net/can/af_can.c
>> index 5518a7d9eed9..128d37a4c2e0 100644
>> --- a/net/can/af_can.c
>> +++ b/net/can/af_can.c
>> @@ -86,11 +86,12 @@ static atomic_t skbcounter = ATOMIC_INIT(0);
>>  
>>  /* af_can socket functions */
>>  
>> -static void can_sock_destruct(struct sock *sk)
>> +void can_sock_destruct(struct sock *sk)
>>  {
>>  	skb_queue_purge(&sk->sk_receive_queue);
>>  	skb_queue_purge(&sk->sk_error_queue);
>>  }
>> +EXPORT_SYMBOL(can_sock_destruct);
> 
> If the users are only expected to be another can module, it might make
> sense to use a namespace here?!

How?

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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