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

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Message-ID: <12371430.O9o76ZdvQC@natalenko.name>
Date: Mon, 29 Jan 2024 16:58:12 +0100
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>
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>
Subject: Re: Flood of logitech-hidpp-device messages in v6.7

Hello.

On úterý 9. ledna 2024 12:58:10 CET Hans de Goede wrote:
> Hi Oleksandr,
> 
> On 1/9/24 12:45, Oleksandr Natalenko wrote:
> > 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?
> 
> Yes this is expected, looking at your logs I see about 10 messages per
> hour which IMHO is not that bad.
> 
> I guess we could change things to track we have logged the connect
> message once and if yes then log future connect messages (and all
> disconnect messages) at debug level.

How granular such a tracking should be? Per-`struct hidpp_device`?

Should there be something like `hid_info_once_then_dbg()` macro, or open-code it in each place instead?

Thanks.

> Jiri, Benjamin, do you have any opinion on this ?
> 
> Regards,
> 
> Hans
> 
> 
> 
> 


-- 
Oleksandr Natalenko (post-factum)
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