linux-kernel - Flood of logitech-hidpp-device messages in v6.7

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Date: Tue, 09 Jan 2024 12:45:37 +0100
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: linux-kernel@...r.kernel.org
Cc: linux-input@...r.kernel.org,
 Filipe Laíns <lains@...eup.net>,
 Bastien Nocera <hadess@...ess.net>, Jiri Kosina <jikos@...nel.org>,
 Benjamin Tissoires <benjamin.tissoires@...hat.com>,
 Hans de Goede <hdegoede@...hat.com>
Subject: Flood of logitech-hidpp-device messages in v6.7

Hello Hans et al.

Starting from v6.7 release I get the following messages repeating in `dmesg` regularly:

```
Jan 09 10:05:06 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
Jan 09 10:07:15 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
Jan 09 10:16:51 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
Jan 09 10:16:55 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 10:16:55 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 10:36:31 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
Jan 09 10:37:07 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
Jan 09 10:46:21 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
Jan 09 10:48:23 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
Jan 09 11:12:27 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
Jan 09 11:12:47 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 11:12:47 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 11:38:32 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
Jan 09 11:43:32 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
Jan 09 11:45:10 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
Jan 09 11:45:11 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 11:45:11 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
Jan 09 12:31:48 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
Jan 09 12:33:21 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
```

I've got the following hardware:

* Bus 006 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
* Logitech MX Keys
* Logitech M510v2

With v6.6 I do not get those messages.

I think this is related to 680ee411a98e ("HID: logitech-hidpp: Fix connect event race").

My speculation is that some of the devices enter powersaving state after being idle for some time (5 mins?), and then wake up and reconnect once I touch either keyboard or mouse. I should highlight that everything works just fine, it is the flood of messages that worries me.

Is it expected?

Thank you.

-- 
Oleksandr Natalenko (post-factum)
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