netdev - Re: [PATCH net-next 1/3] mctp: serial: cancel tx work on ldisc close

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Date:   Wed, 24 Nov 2021 07:35:59 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Jeremy Kerr <jk@...econstruct.com.au>, netdev@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Johnston <matt@...econstruct.com.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 1/3] mctp: serial: cancel tx work on ldisc close

On 24. 11. 21, 6:36, Jiri Slaby wrote:
> On 23. 11. 21, 13:50, Jeremy Kerr wrote:
>> We want to ensure that the tx work has finished before returning from
>> the ldisc close op, so do a synchronous cancel.
>>
>> Reported-by: Jiri Slaby <jirislaby@...nel.org>
>> Signed-off-by: Jeremy Kerr <jk@...econstruct.com.au>
>> ---
>>   drivers/net/mctp/mctp-serial.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/mctp/mctp-serial.c 
>> b/drivers/net/mctp/mctp-serial.c
>> index 9ac0e187f36e..c958d773a82a 100644
>> --- a/drivers/net/mctp/mctp-serial.c
>> +++ b/drivers/net/mctp/mctp-serial.c
>> @@ -478,6 +478,7 @@ static void mctp_serial_close(struct tty_struct *tty)
>>       struct mctp_serial *dev = tty->disc_data;
>>       int idx = dev->idx;
>> +    cancel_work_sync(&dev->tx_work);
> 
> But the work still can be queued after the cancel (and before the 
> unregister), right?

Maybe do it in ->ndo_uninit()?

>>       unregister_netdev(dev->netdev);
>>       ida_free(&mctp_serial_ida, idx);
>>   }
>>
> 
> thanks,


-- 
js
suse labs