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Date:   Tue, 6 Jun 2023 20:18:27 +0200
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Subject: Re: [PATCH] HID: logitech-hidpp: Handle timeout differently from busy
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To:     Jiri Kosina <jikos@kernel.org>,
        Linux regressions mailing list <regressions@lists.linux.dev>
Cc:     Bastien Nocera <hadess@hadess.net>, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        "Peter F . Patel-Schneider" <pfpschneider@gmail.com>,
        =?UTF-8?Q?Filipe_La=c3=adns?= <lains@riseup.net>,
        Nestor Lopez Casado <nlopezcasad@logitech.com>,
        Mark Lord <mlord@pobox.com>
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From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>
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On 06.06.23 15:27, Jiri Kosina wrote:
> On Mon, 5 Jun 2023, Linux regression tracking (Thorsten Leemhuis) wrote:
> 
>>>>> If an attempt at contacting a receiver or a device fails because the
>>>>> receiver or device never responds, don't restart the communication, only
>>>>> restart it if the receiver or device answers that it's busy, as originally
>>>>> intended.
>>>>>
>>>>> This was the behaviour on communication timeout before commit 586e8fede795
>>>>> ("HID: logitech-hidpp: Retry commands when device is busy").
>>>>>
>>>>> This fixes some overly long waits in a critical path on boot, when
>>>>> checking whether the device is connected by getting its HID++ version.
>>>>>
>>>>> Signed-off-by: Bastien Nocera <hadess@hadess.net>
>>>>> Suggested-by: Mark Lord <mlord@pobox.com>
>>>>> Fixes: 586e8fede795 ("HID: logitech-hidpp: Retry commands when device is busy")
>>>>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217412
>>> [...]  
>>>>
>>>> I have applied this even before getting confirmation from the reporters in 
>>>> bugzilla, as it's the right thing to do anyway.
>>>
>>> Unfortunately it doesn't seem to cure the reported issue (while reverting 
>>> 586e8fede79 does):
>>
>> BTW, remind me again: was fixing this by reverting 586e8fede79 for now a
>> option? I guess it's not, but if I'm wrong I wonder if that might at
>> this point be the best way forward.
> 
> This should now all be fixed by
> 
>     https://git.kernel.org/linus/7c28afd5512e371773dbb2bf95a31ed5625651d9

Jiri, Benjamin, many many thx for working on this.

Hmmm. No CC: <stable... tag.

Should we ask Greg to pick this up for 6.3 now, or better wait a few
days? He currently already has 6199d23c91ce ("HID: logitech-hidpp:
Handle timeout differently from busy") in his queue for the next 6.3.y
release.

Ciao, Thorsten

P.S.: If the answer is along the lines of "let's backport this quickly",
please consider directly CCing Greg.