QMI fails to release client

[Sai Chaitanya]

Hi again,

The issue seems to have been resolved by including this in open flags:
QMI_DEVICE_OPEN_FLAGS_SYNC.

So, even though the client release hasn't been smooth, a fresh start seems
to work normal.
I am not sure if there are any other downsides of this, but this works for
now.

Thanks and regards,
Sai.

On Thu, Apr 8, 2021 at 2:41 PM Sai Chaitanya <msaichaitanya at gmail.com>
wrote:

> Hej, sorry for the delayed reply. I am using libqmi 1.26. Here are some
> more details about the client allocation issue.
>
> Setup: A usb-modem is plugged in and a data connection is started with
> qmi_client_wds_start_network(). It succeeds and can ping. Now, if the
> module is suddenly pulled out, the application
> calls qmi_device_release_client() and qmi_client_wds_stop_network() as a
> part of exit process and ends up here:
>
> error: couldn't release client: Cannot write message: Error writing to
> file descriptor: No such device
>
> error: operation failed: Cannot write message: Error writing to file
> descriptor: No such device
>
>
> And when we try to fresh start the data connection after plugging the
> module back again with qmi_client_wds_start_network()
>
>
> error: couldn't create client for the  the 'WDS' service: CID allocation
> failed in the CTL client: Transaction timed out
>
> So, it looks like some context is not cleaned up smoothly on the modem in
> this sudden power off situation? Or is there any other exit APIs required
> to be called in such situations?
>
> Regards,
> Sai.
>
> On Mon, Mar 29, 2021 at 3:32 PM Aleksander Morgado <
> aleksander at aleksander.es> wrote:
>
>> Hey,
>>
>> >
>> > Yes it happened after qmi_client_wds_stop_network().
>> > If I try to use QMI_DEVICE_OPEN_FLAGS_PROXY, it crashes. So I removed
>> it for now. I may be missing some pre-condition when using this flag.
>> >
>> > Setup is Linux based, cdc-wdm+qmi_wwan.
>> >
>>
>> Can you debug that crash?, e.g building with debug symbols and running
>> under gdb
>>
>> Also, what libqmi version are you using?
>>
>> --
>> Aleksander
>> https://aleksander.es
>>
>
>
> --
>
>


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