Re: [PATCH] Input: elantech - fix fast_reconnect callback in ps2 mode

[Greg Kroah-Hartman]

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@xxxxxxxxxxxxx/
> Reported-by: Thorsten Leemhuis <linux@xxxxxxxxxxxxx>
> 
> Signed-off-by: Jeffery Miller <jefferymiller@xxxxxxxxxx>
> ---
> 
> 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?  Should it also have a cc: stable tag?

thanks,

greg k-h