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ACPI: scan: Simplify initialization of power and sleep buttons

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It should be perfectly fine to use ACPI if the "fixed" power or sleep
buttons cannot be initialized.  Moreover, running acpi_bus_scan()
successfully on ACPI_ROOT_OBJECT generally causes many devices to
be enumerated and probed, possibly including the entire PCI bus, so
unregistering acpi_root if the registration of the "fixed" buttons
fails is rather unhelpful.

For this reason, do not fail acpi_scan_init() when
acpi_bus_scan_fixed() fails and turn the latter into a void function.

While at it, drop the outdated and misleading comment from
acpi_bus_scan_fixed().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Rafael J. Wysocki 2022-01-11 17:52:00 +01:00
parent b6c55b162b
commit 681e7187ae
1 changed files with 21 additions and 37 deletions
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58
drivers/acpi/scan.c
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@ -2486,42 +2486,33 @@ int acpi_bus_register_early_device(int type)
}
EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
static int acpi_bus_scan_fixed(void)
static void acpi_bus_scan_fixed(void)
{
int result = 0;
/*
* Enumerate all fixed-feature devices.
*/
if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
struct acpi_device *device = NULL;
struct acpi_device *adev = NULL;
result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_POWER_BUTTON, false);
if (result)
return result;
device->flags.match_driver = true;
result = device_attach(&device->dev);
if (result < 0)
return result;
device_init_wakeup(&device->dev, true);
acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
false);
if (adev) {
adev->flags.match_driver = true;
if (device_attach(&adev->dev) >= 0)
device_init_wakeup(&adev->dev, true);
else
dev_dbg(&adev->dev, "No driver\n");
}
}
if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
struct acpi_device *device = NULL;
struct acpi_device *adev = NULL;
result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_SLEEP_BUTTON, false);
if (result)
return result;
device->flags.match_driver = true;
result = device_attach(&device->dev);
acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
false);
if (adev) {
adev->flags.match_driver = true;
if (device_attach(&adev->dev) < 0)
dev_dbg(&adev->dev, "No driver\n");
}
}
return result < 0 ? result : 0;
}
static void __init acpi_get_spcr_uart_addr(void)
@ -2601,15 +2592,8 @@ void __init acpi_scan_init(void)
goto out;
/* Fixed feature devices do not exist on HW-reduced platform */
if (!acpi_gbl_reduced_hardware) {
if (acpi_bus_scan_fixed()) {
acpi_detach_data(acpi_root->handle,
acpi_scan_drop_device);
acpi_device_del(acpi_root);
acpi_bus_put_acpi_device(acpi_root);
goto out;
}
}
if (!acpi_gbl_reduced_hardware)
acpi_bus_scan_fixed();
acpi_turn_off_unused_power_resources();