linux-kernel - Re: [PATCH] Input: elantech - fix fast

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Date:   Wed, 4 Oct 2023 08:34:58 +0200
From:   Thorsten Leemhuis <linux@...mhuis.info>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeffery Miller <jefferymiller@...gle.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        regressions@...ts.linux.dev, benjamin.tissoires@...hat.com,
        Andrew Duggan <aduggan@...aptics.com>,
        Andrew Duggan <andrew@...gan.us>, loic.poulain@...aro.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: elantech - fix fast_reconnect callback in ps2 mode

On 04.10.23 08:19, Greg Kroah-Hartman wrote:
> On Tue, Oct 03, 2023 at 07:57:24PM -0500, Jeffery Miller wrote:
>> Make `elantech_setup_ps2` set a compatible fast_reconnect pointer
>> when its ps2 mode is used.
>>
>> When an SMBus connection is attempted and fails `psmouse_smbus_init`
>> sets fast_reconnect to `psmouse_smbus_reconnect`.
>> `psmouse_smbus_reconnect` expects `psmouse->private` to be
>> `struct psmouse_smbus_dev` but `elantech_setup_ps2` replaces
>> it with its private data. This was causing an issue on resume
>> since psmouse_smbus_reconnect was being called while in ps2, not SMBus
>> mode.
>>
>> This was uncovered by commit 92e24e0e57f7 ("Input: psmouse - add delay when
>> deactivating for SMBus mode")
>>
>> Closes:
>> Link:https://lore.kernel.org/all/ca0109fa-c64b-43c1-a651-75b294d750a1@leemhuis.info/
>> Reported-by: Thorsten Leemhuis <linux@...mhuis.info>
>>
>> Signed-off-by: Jeffery Miller <jefferymiller@...gle.com>
>> ---
>>
>> The other callbacks set in psmouse_smbus_init are already replaced.
>> Should fast_reconnect be set to `elantech_reconnect` instead?
> 
> What commit id does this fix? 

Good point, yes, it also needs this:

Fixes: 92e24e0e57f72e ("Input: psmouse - add delay when deactivating for
SMBus mode")

> Should it also have a cc: stable tag?

Not that I can see, as that commit was merged for 6.6 and not backported
(no idea why Jeffery CCed the stable list, maybe I'm missing something)

Ciao, Thorsten