linux-kernel - Re:Re: [PATCH net] wwan: core: add print for wwan port attach/disconnect

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Date:   Thu, 13 Apr 2023 15:25:35 +0800 (CST)
From:   "Slark Xiao" <slark_xiao@....com>
To:     "Loic Poulain" <loic.poulain@...aro.org>
Cc:     ryazanov.s.a@...il.com, johannes@...solutions.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH net] wwan: core: add print for wwan port
 attach/disconnect

At 2023-04-13 15:07:21, "Loic Poulain" <loic.poulain@...aro.org> wrote:
>On Wed, 12 Apr 2023 at 13:45, Slark Xiao <slark_xiao@....com> wrote:
>>
>> Refer to USB serial device or net device, there is notice to
>> let end user know the status of device, like attached or
>> disconnected. Add attach/disconnect print for wwan device as
>> well. This change works for MHI device and USB device.
>
>This change works for wwan port devices, whatever the bus is.
>
Sure. Since wwan support USB device as well after integrating
WWAN framework into cdc-wdm.
>>
>> Signed-off-by: Slark Xiao <slark_xiao@....com>
>> ---
>>  drivers/net/wwan/wwan_core.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
>> index 2e1c01cf00a9..d3ac6c5b0b26 100644
>> --- a/drivers/net/wwan/wwan_core.c
>> +++ b/drivers/net/wwan/wwan_core.c
>> @@ -492,6 +492,8 @@ struct wwan_port *wwan_create_port(struct device *parent,
>>         if (err)
>>                 goto error_put_device;
>>
>> +       dev_info(&wwandev->dev, "%s converter now attached to %s\n",
>> +                wwan_port_dev_type.name, port->dev.kobj.name);
>
>You should use `dev_name()` instead of direct reference to kobj.
>
Will update this in v2.
>Why 'converter' ? If you really want to print, it should be something like:
>wwan0: wwan0at1 port attached
This refer to USB device attached info:
  696.444511] usb 2-3: GSM modem (1-port) converter now attached to ttyUSB0
[  696.444877] usb 2-3: GSM modem (1-port) converter now attached to ttyUSB1
[  696.445065] usb 2-3: GSM modem (1-port) converter now attached to ttyUSB2
currently, we will print it as below with above patch:
[  233.192123] wwan wwan0: wwan_port converter now attached to wwan0mbim0
[  694.530781] wwan wwan0: wwan_port converter now disconnected from wwan0mbim0
>
>>         return port;
>>
>>  error_put_device:
>> @@ -517,6 +519,9 @@ void wwan_remove_port(struct wwan_port *port)
>>
>>         skb_queue_purge(&port->rxq);
>>         dev_set_drvdata(&port->dev, NULL);
>> +
>> +       dev_info(&wwandev->dev, "%s converter now disconnected from %s\n",
>> +                wwan_port_dev_type.name, port->dev.kobj.name);
>>         device_unregister(&port->dev);
>>
>>         /* Release related wwan device */
>> --
>> 2.34.1
>>
>
>Regards,
>Loic