linux-kernel - [PATCH 5.14 15/15] Revert "ACPI: scan: Release PM resources blocked by unused objects"

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Date:   Fri, 19 Nov 2021 18:38:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Kyle D. Pelton" <kyle.d.pelton@...el.com>,
        Saranya Gopal <saranya.gopal@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.14 15/15] Revert "ACPI: scan: Release PM resources blocked by unused objects"

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

commit 3b2b49e6dfdcf423506a771bf44cee842596351a upstream.

Revert commit c10383e8ddf4 ("ACPI: scan: Release PM resources blocked
by unused objects"), because it causes boot issues to appear on some
platforms.

Reported-by: Kyle D. Pelton <kyle.d.pelton@...el.com>
Reported-by: Saranya Gopal <saranya.gopal@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/acpi/glue.c     |   25 -------------------------
 drivers/acpi/internal.h |    1 -
 drivers/acpi/scan.c     |    6 ------
 3 files changed, 32 deletions(-)

--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -363,28 +363,3 @@ int acpi_platform_notify(struct device *
 	}
 	return 0;
 }
-
-int acpi_dev_turn_off_if_unused(struct device *dev, void *not_used)
-{
-	struct acpi_device *adev = to_acpi_device(dev);
-
-	/*
-	 * Skip device objects with device IDs, because they may be in use even
-	 * if they are not companions of any physical device objects.
-	 */
-	if (adev->pnp.type.hardware_id)
-		return 0;
-
-	mutex_lock(&adev->physical_node_lock);
-
-	/*
-	 * Device objects without device IDs are not in use if they have no
-	 * corresponding physical device objects.
-	 */
-	if (list_empty(&adev->physical_node_list))
-		acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
-
-	mutex_unlock(&adev->physical_node_lock);
-
-	return 0;
-}
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -117,7 +117,6 @@ bool acpi_device_is_battery(struct acpi_
 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 					const struct device *dev);
 int acpi_bus_register_early_device(int type);
-int acpi_dev_turn_off_if_unused(struct device *dev, void *not_used);
 
 /* --------------------------------------------------------------------------
                      Device Matching and Notification
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2560,12 +2560,6 @@ int __init acpi_scan_init(void)
 		}
 	}
 
-	/*
-	 * Make sure that power management resources are not blocked by ACPI
-	 * device objects with no users.
-	 */
-	bus_for_each_dev(&acpi_bus_type, NULL, NULL, acpi_dev_turn_off_if_unused);
-
 	acpi_turn_off_unused_power_resources();
 
 	acpi_scan_initialized = true;