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* regression: Bluetooth interface broken on systems with Mediatek CPU
@ 2021-08-06 22:21 Guenter Roeck
  2021-08-09  2:35 ` Kai-Heng Feng
  2021-08-09 13:26 ` Marcel Holtmann
  0 siblings, 2 replies; 6+ messages in thread
From: Guenter Roeck @ 2021-08-06 22:21 UTC (permalink / raw)
  To: regressions; +Cc: stable, Greg Kroah-Hartman, Kai-Heng Feng, Marcel Holtmann

[ Greg asked me to submit a report to regressions@, so here it is. ]

The following error was observed on Chromebooks with MT8183 CPU
(ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):

[  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
[  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
[  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
[  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
[  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
[  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
[  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
[  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
...
[  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
[  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
(repeated several times)
...

The Bluetooth interface on those Chromebooks can not be enabled.

Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
controller after workqueues are flushed or cancelled") introduced the problem.
Reverting it fixes the problem.

The problem was also reported at [1] on a Mediatek Pumpkin board.

As of this writing, the problem is still present in the upstream kernel
as well as in all stable releases which include commit 0ea9fd001a14.

Thanks,
Guenter

---
[1] https://lkml.org/lkml/2021/7/28/569

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: regression: Bluetooth interface broken on systems with Mediatek CPU
  2021-08-06 22:21 regression: Bluetooth interface broken on systems with Mediatek CPU Guenter Roeck
@ 2021-08-09  2:35 ` Kai-Heng Feng
  2021-08-09  4:10   ` Guenter Roeck
  2021-08-09 13:26 ` Marcel Holtmann
  1 sibling, 1 reply; 6+ messages in thread
From: Kai-Heng Feng @ 2021-08-09  2:35 UTC (permalink / raw)
  To: Guenter Roeck; +Cc: regressions, stable, Greg Kroah-Hartman, Marcel Holtmann

On Sat, Aug 7, 2021 at 6:22 AM Guenter Roeck <linux@roeck-us.net> wrote:
>
> [ Greg asked me to submit a report to regressions@, so here it is. ]
>
> The following error was observed on Chromebooks with MT8183 CPU
> (ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
>
> [  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
> [  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
> [  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
> [  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
> [  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
> [  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
> [  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
> [  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
> ...
> [  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> [  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> (repeated several times)
> ...
>
> The Bluetooth interface on those Chromebooks can not be enabled.
>
> Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
> controller after workqueues are flushed or cancelled") introduced the problem.
> Reverting it fixes the problem.
>
> The problem was also reported at [1] on a Mediatek Pumpkin board.
>
> As of this writing, the problem is still present in the upstream kernel
> as well as in all stable releases which include commit 0ea9fd001a14.

Thanks. Can you please test the following patch:

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2560ed2f144d4..131e69a9a66a0 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1757,6 +1757,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
                        cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
        }

+       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
+           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
+           test_bit(HCI_UP, &hdev->flags)) {
+               /* Execute vendor specific shutdown routine */
+               if (hdev->shutdown)
+                       hdev->shutdown(hdev);
+       }
+
        /* Avoid potential lockdep warnings from the *_flush() calls by
         * ensuring the workqueue is empty up front.
         */
@@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
                clear_bit(HCI_INIT, &hdev->flags);
        }

-       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
-           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
-           test_bit(HCI_UP, &hdev->flags)) {
-               /* Execute vendor specific shutdown routine */
-               if (hdev->shutdown)
-                       hdev->shutdown(hdev);
-       }
-
        /* flush cmd  work */
        flush_work(&hdev->cmd_work);


>
> Thanks,
> Guenter
>
> ---
> [1] https://lkml.org/lkml/2021/7/28/569

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: regression: Bluetooth interface broken on systems with Mediatek CPU
  2021-08-09  2:35 ` Kai-Heng Feng
@ 2021-08-09  4:10   ` Guenter Roeck
  2021-08-09  4:48     ` Kai-Heng Feng
  0 siblings, 1 reply; 6+ messages in thread
From: Guenter Roeck @ 2021-08-09  4:10 UTC (permalink / raw)
  To: Kai-Heng Feng; +Cc: regressions, stable, Greg Kroah-Hartman, Marcel Holtmann

On Mon, Aug 09, 2021 at 10:35:34AM +0800, Kai-Heng Feng wrote:
> On Sat, Aug 7, 2021 at 6:22 AM Guenter Roeck <linux@roeck-us.net> wrote:
> >
> > [ Greg asked me to submit a report to regressions@, so here it is. ]
> >
> > The following error was observed on Chromebooks with MT8183 CPU
> > (ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
> >
> > [  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
> > [  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
> > [  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
> > [  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
> > [  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
> > [  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
> > [  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
> > [  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
> > ...
> > [  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > [  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > (repeated several times)
> > ...
> >
> > The Bluetooth interface on those Chromebooks can not be enabled.
> >
> > Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
> > controller after workqueues are flushed or cancelled") introduced the problem.
> > Reverting it fixes the problem.
> >
> > The problem was also reported at [1] on a Mediatek Pumpkin board.
> >
> > As of this writing, the problem is still present in the upstream kernel
> > as well as in all stable releases which include commit 0ea9fd001a14.
> 
> Thanks. Can you please test the following patch:
> 
I would love to, but I am unable to apply the patch. It failed to apply
to mainline, to linux-next, and to all stable releases I tried.

Guenter

> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index 2560ed2f144d4..131e69a9a66a0 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -1757,6 +1757,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
>                         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
>         }
> 
> +       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> +           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> +           test_bit(HCI_UP, &hdev->flags)) {
> +               /* Execute vendor specific shutdown routine */
> +               if (hdev->shutdown)
> +                       hdev->shutdown(hdev);
> +       }
> +
>         /* Avoid potential lockdep warnings from the *_flush() calls by
>          * ensuring the workqueue is empty up front.
>          */
> @@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
>                 clear_bit(HCI_INIT, &hdev->flags);
>         }
> 
> -       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> -           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> -           test_bit(HCI_UP, &hdev->flags)) {
> -               /* Execute vendor specific shutdown routine */
> -               if (hdev->shutdown)
> -                       hdev->shutdown(hdev);
> -       }
> -
>         /* flush cmd  work */
>         flush_work(&hdev->cmd_work);
> 
> 
> >
> > Thanks,
> > Guenter
> >
> > ---
> > [1] https://lkml.org/lkml/2021/7/28/569

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: regression: Bluetooth interface broken on systems with Mediatek CPU
  2021-08-09  4:10   ` Guenter Roeck
@ 2021-08-09  4:48     ` Kai-Heng Feng
  2021-08-09 19:18       ` Guenter Roeck
  0 siblings, 1 reply; 6+ messages in thread
From: Kai-Heng Feng @ 2021-08-09  4:48 UTC (permalink / raw)
  To: Guenter Roeck; +Cc: regressions, stable, Greg Kroah-Hartman, Marcel Holtmann

Hi Guenter,

On Mon, Aug 9, 2021 at 12:10 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Mon, Aug 09, 2021 at 10:35:34AM +0800, Kai-Heng Feng wrote:
> > On Sat, Aug 7, 2021 at 6:22 AM Guenter Roeck <linux@roeck-us.net> wrote:
> > >
> > > [ Greg asked me to submit a report to regressions@, so here it is. ]
> > >
> > > The following error was observed on Chromebooks with MT8183 CPU
> > > (ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
> > >
> > > [  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
> > > [  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
> > > [  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
> > > [  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
> > > [  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
> > > [  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
> > > [  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
> > > [  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
> > > ...
> > > [  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > > [  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > > (repeated several times)
> > > ...
> > >
> > > The Bluetooth interface on those Chromebooks can not be enabled.
> > >
> > > Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
> > > controller after workqueues are flushed or cancelled") introduced the problem.
> > > Reverting it fixes the problem.
> > >
> > > The problem was also reported at [1] on a Mediatek Pumpkin board.
> > >
> > > As of this writing, the problem is still present in the upstream kernel
> > > as well as in all stable releases which include commit 0ea9fd001a14.
> >
> > Thanks. Can you please test the following patch:
> >
> I would love to, but I am unable to apply the patch. It failed to apply
> to mainline, to linux-next, and to all stable releases I tried.

I think it has something to do with how the code gets pasted to the mail client.
So can you please give this a try:
https://paste.ubuntu.com/p/CsRrQWNYKr/

Kai-Heng

>
> Guenter
>
> > diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> > index 2560ed2f144d4..131e69a9a66a0 100644
> > --- a/net/bluetooth/hci_core.c
> > +++ b/net/bluetooth/hci_core.c
> > @@ -1757,6 +1757,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
> >                         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
> >         }
> >
> > +       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> > +           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> > +           test_bit(HCI_UP, &hdev->flags)) {
> > +               /* Execute vendor specific shutdown routine */
> > +               if (hdev->shutdown)
> > +                       hdev->shutdown(hdev);
> > +       }
> > +
> >         /* Avoid potential lockdep warnings from the *_flush() calls by
> >          * ensuring the workqueue is empty up front.
> >          */
> > @@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
> >                 clear_bit(HCI_INIT, &hdev->flags);
> >         }
> >
> > -       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> > -           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> > -           test_bit(HCI_UP, &hdev->flags)) {
> > -               /* Execute vendor specific shutdown routine */
> > -               if (hdev->shutdown)
> > -                       hdev->shutdown(hdev);
> > -       }
> > -
> >         /* flush cmd  work */
> >         flush_work(&hdev->cmd_work);
> >
> >
> > >
> > > Thanks,
> > > Guenter
> > >
> > > ---
> > > [1] https://lkml.org/lkml/2021/7/28/569

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: regression: Bluetooth interface broken on systems with Mediatek CPU
  2021-08-06 22:21 regression: Bluetooth interface broken on systems with Mediatek CPU Guenter Roeck
  2021-08-09  2:35 ` Kai-Heng Feng
@ 2021-08-09 13:26 ` Marcel Holtmann
  1 sibling, 0 replies; 6+ messages in thread
From: Marcel Holtmann @ 2021-08-09 13:26 UTC (permalink / raw)
  To: Guenter Roeck; +Cc: regressions, stable, Greg Kroah-Hartman, Kai-Heng Feng

Hi Guenter,

> [ Greg asked me to submit a report to regressions@, so here it is. ]
> 
> The following error was observed on Chromebooks with MT8183 CPU
> (ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
> 
> [  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
> [  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
> [  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
> [  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
> [  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
> [  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
> [  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
> [  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
> ...
> [  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> [  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> (repeated several times)
> ...
> 
> The Bluetooth interface on those Chromebooks can not be enabled.
> 
> Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
> controller after workqueues are flushed or cancelled") introduced the problem.
> Reverting it fixes the problem.
> 
> The problem was also reported at [1] on a Mediatek Pumpkin board.
> 
> As of this writing, the problem is still present in the upstream kernel
> as well as in all stable releases which include commit 0ea9fd001a14.

post it to the linux-bluetooth@vger mailing list. This is Qualcomm driver
specific and maybe they broke something. However there is an ongoing
discussion about your bi-sected commit regarding Mediatek Bluetooth device
where this seems to also have caused a problem.

Regards

Marcel


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: regression: Bluetooth interface broken on systems with Mediatek CPU
  2021-08-09  4:48     ` Kai-Heng Feng
@ 2021-08-09 19:18       ` Guenter Roeck
  0 siblings, 0 replies; 6+ messages in thread
From: Guenter Roeck @ 2021-08-09 19:18 UTC (permalink / raw)
  To: Kai-Heng Feng; +Cc: regressions, stable, Greg Kroah-Hartman, Marcel Holtmann

On Mon, Aug 09, 2021 at 12:48:16PM +0800, Kai-Heng Feng wrote:
> Hi Guenter,
> 
> On Mon, Aug 9, 2021 at 12:10 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >
> > On Mon, Aug 09, 2021 at 10:35:34AM +0800, Kai-Heng Feng wrote:
> > > On Sat, Aug 7, 2021 at 6:22 AM Guenter Roeck <linux@roeck-us.net> wrote:
> > > >
> > > > [ Greg asked me to submit a report to regressions@, so here it is. ]
> > > >
> > > > The following error was observed on Chromebooks with MT8183 CPU
> > > > (ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
> > > >
> > > > [  224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
> > > > [  225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID   :0x00000008
> > > > [  225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version  :0x00000044
> > > > [  225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version  :0x00000302
> > > > [  225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
> > > > [  225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
> > > > [  225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
> > > > [  227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
> > > > ...
> > > > [  223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > > > [  223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
> > > > (repeated several times)
> > > > ...
> > > >
> > > > The Bluetooth interface on those Chromebooks can not be enabled.
> > > >
> > > > Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
> > > > controller after workqueues are flushed or cancelled") introduced the problem.
> > > > Reverting it fixes the problem.
> > > >
> > > > The problem was also reported at [1] on a Mediatek Pumpkin board.
> > > >
> > > > As of this writing, the problem is still present in the upstream kernel
> > > > as well as in all stable releases which include commit 0ea9fd001a14.
> > >
> > > Thanks. Can you please test the following patch:
> > >
> > I would love to, but I am unable to apply the patch. It failed to apply
> > to mainline, to linux-next, and to all stable releases I tried.
> 
> I think it has something to do with how the code gets pasted to the mail client.
> So can you please give this a try:
> https://paste.ubuntu.com/p/CsRrQWNYKr/
> 
That is different to the patch you just submitted. I assume that patch is
the final version. I assume that is the final version. Since it was already
tested, I'll stop testing this one.

Guenter

> Kai-Heng
> 
> >
> > Guenter
> >
> > > diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> > > index 2560ed2f144d4..131e69a9a66a0 100644
> > > --- a/net/bluetooth/hci_core.c
> > > +++ b/net/bluetooth/hci_core.c
> > > @@ -1757,6 +1757,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
> > >                         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
> > >         }
> > >
> > > +       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> > > +           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> > > +           test_bit(HCI_UP, &hdev->flags)) {
> > > +               /* Execute vendor specific shutdown routine */
> > > +               if (hdev->shutdown)
> > > +                       hdev->shutdown(hdev);
> > > +       }
> > > +
> > >         /* Avoid potential lockdep warnings from the *_flush() calls by
> > >          * ensuring the workqueue is empty up front.
> > >          */
> > > @@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
> > >                 clear_bit(HCI_INIT, &hdev->flags);
> > >         }
> > >
> > > -       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> > > -           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> > > -           test_bit(HCI_UP, &hdev->flags)) {
> > > -               /* Execute vendor specific shutdown routine */
> > > -               if (hdev->shutdown)
> > > -                       hdev->shutdown(hdev);
> > > -       }
> > > -
> > >         /* flush cmd  work */
> > >         flush_work(&hdev->cmd_work);
> > >
> > >
> > > >
> > > > Thanks,
> > > > Guenter
> > > >
> > > > ---
> > > > [1] https://lkml.org/lkml/2021/7/28/569

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-08-09 19:18 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-06 22:21 regression: Bluetooth interface broken on systems with Mediatek CPU Guenter Roeck
2021-08-09  2:35 ` Kai-Heng Feng
2021-08-09  4:10   ` Guenter Roeck
2021-08-09  4:48     ` Kai-Heng Feng
2021-08-09 19:18       ` Guenter Roeck
2021-08-09 13:26 ` Marcel Holtmann

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