netdev - Re: [PATCH v2 net-next 1/5] l2tp: fix switch default error handling in l2tp_nl_cmd_session

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Message-ID: <CAJ0CqmVmSVSH54cOtpfbNBtPwLfs9z5ab_Pguq7mxSqraK5Yfg@mail.gmail.com>
Date:   Mon, 15 Jan 2018 22:18:53 +0100
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Guillaume Nault <g.nault@...halink.fr>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        James Chapman <jchapman@...alix.com>
Subject: Re: [PATCH v2 net-next 1/5] l2tp: fix switch default error handling
 in l2tp_nl_cmd_session_create()

> On Sun, Jan 14, 2018 at 03:50:54PM +0100, Lorenzo Bianconi wrote:
>> Although this issue is harmless since that code path is protected by the
>> check on l2tp_nl_cmd_ops[]/l2tp_nl_cmd_ops[]->session_create(), fix error
>> handling for L2TP_PWTYPE_IP/default case in l2tp_nl_cmd_session_create()
>>
>> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
>> ---
>>  net/l2tp/l2tp_netlink.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
>> index e1ca29f79821..48b5bf30ec50 100644
>> --- a/net/l2tp/l2tp_netlink.c
>> +++ b/net/l2tp/l2tp_netlink.c
>> @@ -635,7 +635,7 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
>>       case L2TP_PWTYPE_IP:
>>       default:
>>               ret = -EPROTONOSUPPORT;
>> -             break;
>> +             goto out_tunnel;
>>       }
>>
> Not sure if this change is really worthwhile. As you noted, this is
> unreachable code. And this switch should better be removed entirely:
> it doesn't do anything for supported pseudo-wires.
>
> And if PWTYPE_ETH_VLAN were to be implemented, it should perform its
> configuration consistency checking in its own PW specific code, not in
> the genl handler.
>

Personally I would prefer to not remove some code that could be useful
for a future implementation, but just fix it if it presents issues to
address.
Anyway we can simply drop this patch from the series and I can send a
new one to remove the switch entirely.

@James what do you think?

Regards,
Lorenzo

> Anyway, removing this switch isn't the purpose of this series, so I
> think you can drop this patch.