Merge tag 'acpi-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These rework the handling of ACPI device objects to use the driver
  core facilities for managing child ones instead of some questionable
  home-grown ways without the requisite locking and reference counting,
  clean up the EC driver, improve suspend-to-idle handling on x86, add
  some systems to the ACPI backlight quirk list, fix some assorted
  issues, clean up code and improve documentation.

  Specifics:

   - Use facilities provided by the driver core and some additional
     helpers to handle the children of a given ACPI device object in
     multiple places instead of using the children and node list heads
     in struct acpi_device which is error prone (Rafael Wysocki).

   - Fix ACPI-related device reference counting issue in the hisi_lpc
     bus driver (Yang Yingliang).

   - Drop the children and node list heads that are not needed any more
     from struct acpi_device (Rafael Wysocki).

   - Drop driver member from struct acpi_device (Uwe Kleine-König).

   - Drop redundant check from acpi_device_remove() (Uwe Kleine-König).

   - Prepare the CPPC library for handling backwards-compatible future
     _CPC return package formats gracefully (Rafael Wysocki).

   - Clean up the ACPI EC driver after previous changes in it (Hans de
     Goede).

   - Drop leftover acpi_processor_get_limit_info() declaration (Riwen
     Lu).

   - Split out thermal initialization from ACPI PSS (Riwen Lu).

   - Annotate more functions in the ACPI CPU idle driver to live in the
     cpuidle section (Guilherme G. Piccoli).

   - Fix _EINJ vs "special purpose" EFI memory regions (Dan Williams).

   - Implement a better fix to avoid spamming the console with old error
     logs (Tony Luck).

   - Fix typo in a comment in the APEI code (Xiang wangx).

   - Save NVS memory during transitions into S3 on Lenovo G40-45 (Manyi
     Li).

   - Add support for upcoming AMD uPEP device ID AMDI008 to the ACPI
     suspend-to-idle driver for x86 platforms (Shyam Sundar S K).

   - Clean up checks related to the ACPI_FADT_LOW_POWER_S0 platform flag
     in the LPIT table driver and the suspend-to-idle driver for x86
     platforms (Rafael Wysocki).

   - Print information messages regarding declared LPS0 idle support in
     the platform firmware (Rafael Wysocki).

   - Fix missing check in register_device_clock() in the ACPI driver for
     Intel SoCs (huhai).

   - Fix ACS setup in the VIOT table parser (Eric Auger).

   - Skip IRQ override on AMD Zen platforms where it's harmful
     (Chuanhong Guo).

   - Use native backlight on Dell Inspiron N4010 (Hans de Goede).

   - Use native backlight on some TongFang devices (Werner Sembach).

   - Drop X86 dependency from the ACPI backlight driver Kconfig (Riwen
     Lu).

   - Shorten the quirk list in the ACPI backlight driver by identifying
     Clevo by board_name only (Werner Sembach).

   - Remove useless NULL pointer checks from 2 ACPI PCI link management
     functions (Andrey Strachuk).

   - Fix obsolete example in the ACPI EINJ documentation (Qifu Zhang).

   - Update links and references to _DSD-related documents (Sudeep
     Holla)"

* tag 'acpi-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (46 commits)
  ACPI/PCI: Remove useless NULL pointer checks
  ACPI: CPPC: Do not prevent CPPC from working in the future
  ACPI: PM: x86: Print messages regarding LPS0 idle support
  ACPI: resource: skip IRQ override on AMD Zen platforms
  Documentation: ACPI: EINJ: Fix obsolete example
  ACPI: video: Use native backlight on Dell Inspiron N4010
  ACPI: PM: s2idle: Use LPS0 idle if ACPI_FADT_LOW_POWER_S0 is unset
  Revert "ACPI / PM: LPIT: Register sysfs attributes based on FADT"
  ACPI: video: Shortening quirk list by identifying Clevo by board_name only
  ACPI: video: Force backlight native for some TongFang devices
  ACPI: PM: s2idle: Add support for upcoming AMD uPEP HID AMDI008
  ACPI: VIOT: Fix ACS setup
  ACPI: bus: Drop unused list heads from struct acpi_device
  hisi_lpc: Use acpi_dev_for_each_child()
  bus: hisi_lpc: fix missing platform_device_put() in hisi_lpc_acpi_probe()
  ACPI: bus: Drop driver member of struct acpi_device
  ACPI: bus: Drop redundant check in acpi_device_remove()
  ACPI: APEI: Fix _EINJ vs EFI_MEMORY_SP
  ACPI: LPSS: Fix missing check in register_device_clock()
  ACPI: APEI: Better fix to avoid spamming the console with old error logs
  ...

1 files changed, 30 insertions, 17 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 0dbb39ef4179..c0d20d997891 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -464,7 +464,6 @@ out_free:
 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 {
 	struct acpi_device *adev;
-	struct acpi_driver *driver;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 	bool hotplug_event = false;
 
@@ -516,10 +515,13 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 	if (!adev)
 		goto err;
 
-	driver = adev->driver;
-	if (driver && driver->ops.notify &&
-	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
-		driver->ops.notify(adev, type);
+	if (adev->dev.driver) {
+		struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
+
+		if (driver && driver->ops.notify &&
+		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
+			driver->ops.notify(adev, type);
+	}
 
 	if (!hotplug_event) {
 		acpi_bus_put_acpi_device(adev);
@@ -538,8 +540,9 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 {
 	struct acpi_device *device = data;
+	struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
 
-	device->driver->ops.notify(device, event);
+	acpi_drv->ops.notify(device, event);
 }
 
 static void acpi_notify_device_fixed(void *data)
@@ -1032,8 +1035,6 @@ static int acpi_device_probe(struct device *dev)
 	if (ret)
 		return ret;
 
-	acpi_dev->driver = acpi_drv;
-
 	pr_debug("Driver [%s] successfully bound to device [%s]\n",
 		 acpi_drv->name, acpi_dev->pnp.bus_id);
 
@@ -1043,7 +1044,6 @@ static int acpi_device_probe(struct device *dev)
 			if (acpi_drv->ops.remove)
 				acpi_drv->ops.remove(acpi_dev);
 
-			acpi_dev->driver = NULL;
 			acpi_dev->driver_data = NULL;
 			return ret;
 		}
@@ -1059,15 +1059,14 @@ static int acpi_device_probe(struct device *dev)
 static void acpi_device_remove(struct device *dev)
 {
 	struct acpi_device *acpi_dev = to_acpi_device(dev);
-	struct acpi_driver *acpi_drv = acpi_dev->driver;
+	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
+
+	if (acpi_drv->ops.notify)
+		acpi_device_remove_notify_handler(acpi_dev);
+
+	if (acpi_drv->ops.remove)
+		acpi_drv->ops.remove(acpi_dev);
 
-	if (acpi_drv) {
-		if (acpi_drv->ops.notify)
-			acpi_device_remove_notify_handler(acpi_dev);
-		if (acpi_drv->ops.remove)
-			acpi_drv->ops.remove(acpi_dev);
-	}
-	acpi_dev->driver = NULL;
 	acpi_dev->driver_data = NULL;
 
 	put_device(dev);
@@ -1101,6 +1100,7 @@ static int acpi_dev_for_one_check(struct device *dev, void *context)
 
 	return adwc->fn(to_acpi_device(dev), adwc->data);
 }
+EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
 
 int acpi_dev_for_each_child(struct acpi_device *adev,
 			    int (*fn)(struct acpi_device *, void *), void *data)
@@ -1113,6 +1113,18 @@ int acpi_dev_for_each_child(struct acpi_device *adev,
 	return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
 }
 
+int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
+				    int (*fn)(struct acpi_device *, void *),
+				    void *data)
+{
+	struct acpi_dev_walk_context adwc = {
+		.fn = fn,
+		.data = data,
+	};
+
+	return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
+}
+
 /* --------------------------------------------------------------------------
                              Initialization/Cleanup
    -------------------------------------------------------------------------- */
@@ -1402,6 +1414,7 @@ static int __init acpi_init(void)
 
 	pci_mmcfg_late_init();
 	acpi_iort_init();
+	acpi_viot_early_init();
 	acpi_hest_init();
 	acpi_ghes_init();
 	acpi_scan_init();