netdev - Re: [PATCH net-next 06/10] net: iosm: drop custom netdev(s) removing

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Date:   Sun, 20 Jun 2021 18:20:20 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     M Chetan Kumar <m.chetan.kumar@...el.com>
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Johannes Berg <johannes@...solutions.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Intel Corporation <linuxwwan@...el.com>
Subject: Re: [PATCH net-next 06/10] net: iosm: drop custom netdev(s) removing

Hello Chetan,

On Tue, Jun 15, 2021 at 3:30 AM Sergey Ryazanov <ryazanov.s.a@...il.com> wrote:
> Since the last commit, the WWAN core will remove all our network
> interfaces for us at the time of the WWAN netdev ops unregistering.
> Therefore, we can safely drop the custom code that cleaning the list of
> created netdevs. Anyway it no longer removes any netdev, since all
> netdevs were removed earlier in the wwan_unregister_ops() call.

Are you Ok with this change? I plan to submit a next version of the
series. If you have any objections, I can address them in V2.

BTW, if IOSM modems have a default data channel, I can add a separate
patch to the series to create a default network interface for IOSM if
you tell me which link id is used for the default data channel.

> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
> CC: M Chetan Kumar <m.chetan.kumar@...el.com>
> CC: Intel Corporation <linuxwwan@...el.com>
> ---
>  drivers/net/wwan/iosm/iosm_ipc_wwan.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
>
> diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.c b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
> index 1711b79fc616..bee9b278223d 100644
> --- a/drivers/net/wwan/iosm/iosm_ipc_wwan.c
> +++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
> @@ -329,22 +329,9 @@ struct iosm_wwan *ipc_wwan_init(struct iosm_imem *ipc_imem, struct device *dev)
>
>  void ipc_wwan_deinit(struct iosm_wwan *ipc_wwan)
>  {
> -       int if_id;
> -
> +       /* This call will remove all child netdev(s) */
>         wwan_unregister_ops(ipc_wwan->dev);
>
> -       for (if_id = 0; if_id < ARRAY_SIZE(ipc_wwan->sub_netlist); if_id++) {
> -               struct iosm_netdev_priv *priv;
> -
> -               priv = rcu_access_pointer(ipc_wwan->sub_netlist[if_id]);
> -               if (!priv)
> -                       continue;
> -
> -               rtnl_lock();
> -               ipc_wwan_dellink(ipc_wwan, priv->netdev, NULL);
> -               rtnl_unlock();
> -       }
> -
>         mutex_destroy(&ipc_wwan->if_mutex);
>
>         kfree(ipc_wwan);

-- 
Sergey