linux-kernel - Re: drivers/net/ethernet/chelsio/cxgb4/sge.c:2571 cxgb4_ethofld_send

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Message-ID: <CACT4ouf-v+G7oCAFRqZWYQUqs8o1GdSKRbqJwjjP_cNuPFKvgA@mail.gmail.com>
Date:   Wed, 7 Jul 2021 10:33:22 +0200
From:   Íñigo Huguet <ihuguet@...hat.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>, rajur@...lsio.com
Cc:     kbuild@...ts.01.org, lkp@...el.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: drivers/net/ethernet/chelsio/cxgb4/sge.c:2571 cxgb4_ethofld_send_flowc()
 warn: missing error code 'ret'

On Wed, Jul 7, 2021 at 9:37 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2564     if (tc != FW_SCHED_CLS_NONE) {
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2565             if (eosw_txq->state != CXGB4_EO_STATE_CLOSED)
> 52bfcdd87e83d9 Íñigo Huguet        2021-05-05  2566                     goto out_free_skb;
>                                                                         ^^^^^^^^^^^^^^^^^
>
> Are these error paths?
>
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2567
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2568             next_state = CXGB4_EO_STATE_FLOWC_OPEN_SEND;
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2569     } else {
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2570             if (eosw_txq->state != CXGB4_EO_STATE_ACTIVE)
> 52bfcdd87e83d9 Íñigo Huguet        2021-05-05 @2571                     goto out_free_skb;
>
> Here too
>
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2572
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2573             next_state = CXGB4_EO_STATE_FLOWC_CLOSE_SEND;
> 0e395b3cb1fb82 Rahul Lakkireddy    2019-11-07  2574     }

I'm not really sure, I just added the skb release in the exit path to
fix a memory leak.

I think it might not be an error path in this case, maybe just no
actions must be done in this specific cases. CCing Raju Rangoju from
Chelsio to see if he can confirm.

-- 
Íñigo Huguet