Re: [PATCH v5 1/4] ACPI / scan: Initialize status to ACPI_STA_DEFAULT

From: Rafael J. Wysocki
Date: Thu Aug 09 2018 - 05:35:12 EST

On Thu, Aug 9, 2018 at 11:15 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
> Since commit 63347db0affa ("ACPI / scan: Use acpi_bus_get_status() to
> initialize ACPI_TYPE_DEVICE devs") the status field of normal acpi_devices
> gets set to 0 by acpi_bus_type_and_status() and filled with its actual
> value later when acpi_add_single_object() calls acpi_bus_get_status().
> This means that any acpi_match_device_ids() calls in between will always
> fail with -ENOENT.
> We already have a workaround for this, which temporary forces status to
> ACPI_STA_DEFAULT in drivers/acpi/x86/utils.c: acpi_device_always_present()
> and the next commit in this series adds another acpi_match_device_ids()
> call between status being initialized as 0 and the acpi_bus_get_status()
> call.
> Rather then adding another workaround, this commit makes
> acpi_bus_type_and_status() initialize status to ACPI_STA_DEFAULT, this is
> safe to do as the only code looking at status between the initialization
> and the acpi_bus_get_status() call is those acpi_match_device_ids() calls.
> Note this does mean that we need to (re)set status to 0 in case the
> acpi_bus_get_status() call fails.
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v3:
> -New patch in v3 of this patch-set
> Changes in v4:
> -This is not a fix for acpi_is_indirect_io_slave() as I thought at first,
> acpi_is_indirect_io_slave() calls acpi_match_device_ids() on its parent
> device, where status is already set properly. Rewrite the commit message
> accordingly.

I've applied the v4 of this patch and I don't think there are any
changes from it here.

As for the rest of the series I'll wait from comments from Wolfram and
the other reviewers.