ACPI / bus: Do not traverse through non-existed device table

Quoted 17 lines · Andy Shevchenko

Quoted 16 lines · Andy Shevchenko

Quoted 6 lines · Sinan Kaya

Quoted 3 lines · Andy Shevchenko

When __acpi_match_device() is called it would be possible to have
ACPI ID table a MULL pointer. To avoid potential dereference,

NULL

Thanks, will fix later.

Quoted 1 line

Why not bail out here immediately if ids is null?

Because of the code which wasn't in context of this patch.

See also patch 1 in the series.

Quoted 5 lines

Quoted 1 line

It's about how acpi_driver_match_device() uses it.

Btw, it makes device_get_match_data() to work properly on PRP0001 kind
of devices.

Maybe combine this one with the [1/6] then, it would make it somewhat easier to follow what's going on.