Messages in this thread | | | From | "Rafael J. Wysocki" <> | Date | Wed, 27 Oct 2021 19:23:43 +0200 | Subject | Re: [PATCH] ACPI: glue: Use acpi_device_adr() in acpi_find_child_device() |
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On Wed, Oct 27, 2021 at 7:17 PM Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote: > > On Wed, Oct 27, 2021 at 06:59:06PM +0200, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > Instead of evaluating _ADR in acpi_find_child_device(), use the > > observation that it has already been evaluated and the value returned > > by it has been stored in the pnp.type.bus_address field of the ACPI > > device object at hand. > > ... > > > + acpi_bus_address addr = acpi_device_adr(adev); > > int score; > > > > - status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR, > > - NULL, &addr); > > - if (ACPI_FAILURE(status) || addr != address) > > + if (!adev->pnp.type.bus_address || addr != address) > > continue; > > I'm not sure I understand the new check, i.e. !adev->pnp.type.bus_address.
See acpi_set_pnp_ids().
adev->pnp.bus_addres is the address value and adev->pnp.type.bus_address is a flag that is set to 1 when _ADR is valid.
> IIUC _ADR == 0 is a valid value and children may have it like this.
That's true.
> I believe this change will break the working things (first comes to my mind > is drivers/mfd/intel_quark_i2c_gpio.c).
I don't think so.
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