netdev - Re: Re: [RFC PATCH v2 0/6] net: wwan: add NMEA port type support

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Message-ID: <CAFEp6-18FHj1Spw-=2j_cccmLTKHDS3uHR4ONw8geiTyWrxN2Q@mail.gmail.com>
Date: Thu, 2 Oct 2025 17:44:18 +0200
From: Loic Poulain <loic.poulain@....qualcomm.com>
To: Daniele Palmas <dnlplm@...il.com>
Cc: Slark Xiao <slark_xiao@....com>, Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Muhammad Nuzaihan <zaihan@...ealasia.net>,
        Johannes Berg <johannes@...solutions.net>,
        Andrew Lunn <andrew+netdev@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        netdev@...r.kernel.org, Qiang Yu <quic_qianyu@...cinc.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Johan Hovold <johan@...nel.org>
Subject: Re: Re: [RFC PATCH v2 0/6] net: wwan: add NMEA port type support

On Tue, Sep 30, 2025 at 9:22 AM Daniele Palmas <dnlplm@...il.com> wrote:
[...]
> diff --git a/drivers/net/wwan/wwan_hwsim.c b/drivers/net/wwan/wwan_hwsim.c
> index a748b3ea1602..e4b1bbff9af2 100644
> --- a/drivers/net/wwan/wwan_hwsim.c
> +++ b/drivers/net/wwan/wwan_hwsim.c
> @@ -236,7 +236,7 @@ static void wwan_hwsim_nmea_emul_timer(struct timer_list *t)
>         /* 43.74754722298909 N 11.25759835922875 E in DMM format */
>         static const unsigned int coord[4 * 2] = { 43, 44, 8528, 0,
>                                                    11, 15, 4559, 0 };
> -       struct wwan_hwsim_port *port = from_timer(port, t, nmea_emul.timer);
> +       struct wwan_hwsim_port *port = timer_container_of(port, t,
> nmea_emul.timer);
>
> it's basically working fine in operative mode though there's an issue
> at the host shutdown, not able to properly terminate.
>
> Unfortunately I was not able to gather useful text logs besides the picture at
>
> https://drive.google.com/file/d/13ObWikuiMMUENl2aZerzxFBg57OB1KNj/view?usp=sharing
>
> showing an oops with the following call stack:
>
> __simple_recursive_removal
> preempt_count_add
> __pfx_remove_one
> wwan_remove_port
> mhi_wwan_ctrl_remove
> mhi_driver_remove
> device_remove
> device_del
>
> but the issue is systematic. Any idea?
>
> At the moment I don't have the time to debug this deeper, I don't even
> exclude the chance that it could be somehow related to the modem. I
> would like to further look at this, but I'm not sure exactly when I
> can....

Thanks a lot for testing, Sergey, do you know what is wrong with port removal?

Cheers,
Loic