4.10 regression: d79e141c1c6ea7cb70c169971d522b88c8d5b419 breaks PS/2 barcode readers

Hi,

after switching to 4.14 from 4.4 we noticed LS2208 PS/2 barcode stopped
working for us (on Lenovo desktops equipped with USB keyboards). If I plug
PS/2 keyboard, reader works.. (it's cable works as PS/2 splitter).

Digging deeper into this, I noticed kernel stopped probing PS/2 ports directly,
which seems to be caused by d79e141c1c6ea7cb70c169971d522b88c8d5b419,
reverting 

+               if (x86_platform.legacy.i8042 !=
+                               X86_LEGACY_I8042_EXPECTED_PRESENT)
+                       return -ENODEV;

part makes reader working again (without PS/2 keyboard plugged), as well
as using i8042.nopnp.

My question is, what might best solution for that be? Could this be
solved by some quirk? I haven't found any similar to get some idea..

If I could provide some more details, please let me know..

BR

nik

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Ing. Nikola CIPRICH
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