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Subject[PATCH 4.18 105/197] ACPI / scan: Initialize status to ACPI_STA_DEFAULT
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 5971b0c1594d6c34e257101ed5fdffec65205c50 ]

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@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/acpi/scan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1612,7 +1612,8 @@ static int acpi_add_single_object(struct
* Note this must be done before the get power-/wakeup_dev-flags calls.
*/
if (type == ACPI_BUS_TYPE_DEVICE)
- acpi_bus_get_status(device);
+ if (acpi_bus_get_status(device) < 0)
+ acpi_set_device_status(device, 0);

acpi_bus_get_power_flags(device);
acpi_bus_get_wakeup_device_flags(device);
@@ -1690,7 +1691,7 @@ static int acpi_bus_type_and_status(acpi
* acpi_add_single_object updates this once we've an acpi_device
* so that acpi_bus_get_status' quirk handling can be used.
*/
- *sta = 0;
+ *sta = ACPI_STA_DEFAULT;
break;
case ACPI_TYPE_PROCESSOR:
*type = ACPI_BUS_TYPE_PROCESSOR;

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