netdev - Re: [PATCH net] fjes: Fix an error handling path in fjes

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Date:   Wed, 21 Dec 2022 10:59:57 +0100
From:   Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Taku Izumi <izumi.taku@...fujitsu.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] fjes: Fix an error handling path in fjes_probe()

On Tue, Dec 20, 2022 at 09:57:06PM +0100, Christophe JAILLET wrote:
> A netif_napi_add() call is hidden in fjes_sw_init(). It should be undone
> by a corresponding netif_napi_del() call in the error handling path of the
> probe, as already done inthe remove function.
> 
> Fixes: 265859309a76 ("fjes: NAPI polling function")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/net/fjes/fjes_main.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
> index 2513be6d4e11..01b4c9c6adbd 100644
> --- a/drivers/net/fjes/fjes_main.c
> +++ b/drivers/net/fjes/fjes_main.c
> @@ -1370,7 +1370,7 @@ static int fjes_probe(struct platform_device *plat_dev)
>  	adapter->txrx_wq = alloc_workqueue(DRV_NAME "/txrx", WQ_MEM_RECLAIM, 0);
>  	if (unlikely(!adapter->txrx_wq)) {
>  		err = -ENOMEM;
> -		goto err_free_netdev;
> +		goto err_del_napi;
>  	}
>  
>  	adapter->control_wq = alloc_workqueue(DRV_NAME "/control",
> @@ -1431,6 +1431,8 @@ static int fjes_probe(struct platform_device *plat_dev)
>  	destroy_workqueue(adapter->control_wq);
>  err_free_txrx_wq:
>  	destroy_workqueue(adapter->txrx_wq);
> +err_del_napi:
> +	netif_napi_del(&adapter->napi);
>  err_free_netdev:
>  	free_netdev(netdev);
>  err_out:

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

I wonder if it won't be better to have fjes_sw_deinit() instead or
change fjes_sw_init to only netif_napi_add(). You know, to avoid another
bug here when someone add sth to the fjes_sw_deinit(). This is only
suggestion, patch looks fine.

> -- 
> 2.34.1
>