Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 534 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/evhandler.c b/drivers/acpi/acpica/evhandler.c
new file mode 100644
index 000000000..be9a05498
--- /dev/null
+++ b/drivers/acpi/acpica/evhandler.c
@@ -0,0 +1,534 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: evhandler - Support for Address Space handlers
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acevents.h"
+#include "acnamesp.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_EVENTS
+ACPI_MODULE_NAME("evhandler")
+
+/* Local prototypes */
+static acpi_status
+acpi_ev_install_handler(acpi_handle obj_handle,
+			u32 level, void *context, void **return_value);
+
+/* These are the address spaces that will get default handlers */
+
+u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
+	ACPI_ADR_SPACE_SYSTEM_MEMORY,
+	ACPI_ADR_SPACE_SYSTEM_IO,
+	ACPI_ADR_SPACE_PCI_CONFIG,
+	ACPI_ADR_SPACE_DATA_TABLE
+};
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_region_handlers
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Installs the core subsystem default address space handlers.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_install_region_handlers(void)
+{
+	acpi_status status;
+	u32 i;
+
+	ACPI_FUNCTION_TRACE(ev_install_region_handlers);
+
+	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/*
+	 * All address spaces (PCI Config, EC, SMBus) are scope dependent and
+	 * registration must occur for a specific device.
+	 *
+	 * In the case of the system memory and IO address spaces there is
+	 * currently no device associated with the address space. For these we
+	 * use the root.
+	 *
+	 * We install the default PCI config space handler at the root so that
+	 * this space is immediately available even though the we have not
+	 * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
+	 * specification which states that the PCI config space must be always
+	 * available -- even though we are nowhere near ready to find the PCI root
+	 * buses at this point.
+	 *
+	 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
+	 * has already been installed (via acpi_install_address_space_handler).
+	 * Similar for AE_SAME_HANDLER.
+	 */
+	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
+		status = acpi_ev_install_space_handler(acpi_gbl_root_node,
+						       acpi_gbl_default_address_spaces
+						       [i],
+						       ACPI_DEFAULT_HANDLER,
+						       NULL, NULL);
+		switch (status) {
+		case AE_OK:
+		case AE_SAME_HANDLER:
+		case AE_ALREADY_EXISTS:
+
+			/* These exceptions are all OK */
+
+			status = AE_OK;
+			break;
+
+		default:
+
+			goto unlock_and_exit;
+		}
+	}
+
+unlock_and_exit:
+	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_has_default_handler
+ *
+ * PARAMETERS:  node                - Namespace node for the device
+ *              space_id            - The address space ID
+ *
+ * RETURN:      TRUE if default handler is installed, FALSE otherwise
+ *
+ * DESCRIPTION: Check if the default handler is installed for the requested
+ *              space ID.
+ *
+ ******************************************************************************/
+
+u8
+acpi_ev_has_default_handler(struct acpi_namespace_node *node,
+			    acpi_adr_space_type space_id)
+{
+	union acpi_operand_object *obj_desc;
+	union acpi_operand_object *handler_obj;
+
+	/* Must have an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object(node);
+	if (obj_desc) {
+		handler_obj = obj_desc->common_notify.handler;
+
+		/* Walk the linked list of handlers for this object */
+
+		while (handler_obj) {
+			if (handler_obj->address_space.space_id == space_id) {
+				if (handler_obj->address_space.handler_flags &
+				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
+					return (TRUE);
+				}
+			}
+
+			handler_obj = handler_obj->address_space.next;
+		}
+	}
+
+	return (FALSE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_handler
+ *
+ * PARAMETERS:  walk_namespace callback
+ *
+ * DESCRIPTION: This routine installs an address handler into objects that are
+ *              of type Region or Device.
+ *
+ *              If the Object is a Device, and the device has a handler of
+ *              the same type then the search is terminated in that branch.
+ *
+ *              This is because the existing handler is closer in proximity
+ *              to any more regions than the one we are trying to install.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ev_install_handler(acpi_handle obj_handle,
+			u32 level, void *context, void **return_value)
+{
+	union acpi_operand_object *handler_obj;
+	union acpi_operand_object *next_handler_obj;
+	union acpi_operand_object *obj_desc;
+	struct acpi_namespace_node *node;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(ev_install_handler);
+
+	handler_obj = (union acpi_operand_object *)context;
+
+	/* Parameter validation */
+
+	if (!handler_obj) {
+		return (AE_OK);
+	}
+
+	/* Convert and validate the device handle */
+
+	node = acpi_ns_validate_handle(obj_handle);
+	if (!node) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * We only care about regions and objects that are allowed to have
+	 * address space handlers
+	 */
+	if ((node->type != ACPI_TYPE_DEVICE) &&
+	    (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
+		return (AE_OK);
+	}
+
+	/* Check for an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object(node);
+	if (!obj_desc) {
+
+		/* No object, just exit */
+
+		return (AE_OK);
+	}
+
+	/* Devices are handled different than regions */
+
+	if (obj_desc->common.type == ACPI_TYPE_DEVICE) {
+
+		/* Check if this Device already has a handler for this address space */
+
+		next_handler_obj =
+		    acpi_ev_find_region_handler(handler_obj->address_space.
+						space_id,
+						obj_desc->common_notify.
+						handler);
+		if (next_handler_obj) {
+
+			/* Found a handler, is it for the same address space? */
+
+			ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
+					  "Found handler for region [%s] in device %p(%p) handler %p\n",
+					  acpi_ut_get_region_name(handler_obj->
+								  address_space.
+								  space_id),
+					  obj_desc, next_handler_obj,
+					  handler_obj));
+
+			/*
+			 * Since the object we found it on was a device, then it means
+			 * that someone has already installed a handler for the branch
+			 * of the namespace from this device on. Just bail out telling
+			 * the walk routine to not traverse this branch. This preserves
+			 * the scoping rule for handlers.
+			 */
+			return (AE_CTRL_DEPTH);
+		}
+
+		/*
+		 * As long as the device didn't have a handler for this space we
+		 * don't care about it. We just ignore it and proceed.
+		 */
+		return (AE_OK);
+	}
+
+	/* Object is a Region */
+
+	if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
+
+		/* This region is for a different address space, just ignore it */
+
+		return (AE_OK);
+	}
+
+	/*
+	 * Now we have a region and it is for the handler's address space type.
+	 *
+	 * First disconnect region for any previous handler (if any)
+	 */
+	acpi_ev_detach_region(obj_desc, FALSE);
+
+	/* Connect the region to the new handler */
+
+	status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_find_region_handler
+ *
+ * PARAMETERS:  space_id        - The address space ID
+ *              handler_obj     - Head of the handler object list
+ *
+ * RETURN:      Matching handler object. NULL if space ID not matched
+ *
+ * DESCRIPTION: Search a handler object list for a match on the address
+ *              space ID.
+ *
+ ******************************************************************************/
+
+union acpi_operand_object *acpi_ev_find_region_handler(acpi_adr_space_type
+						       space_id,
+						       union acpi_operand_object
+						       *handler_obj)
+{
+
+	/* Walk the handler list for this device */
+
+	while (handler_obj) {
+
+		/* Same space_id indicates a handler is installed */
+
+		if (handler_obj->address_space.space_id == space_id) {
+			return (handler_obj);
+		}
+
+		/* Next handler object */
+
+		handler_obj = handler_obj->address_space.next;
+	}
+
+	return (NULL);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_space_handler
+ *
+ * PARAMETERS:  node            - Namespace node for the device
+ *              space_id        - The address space ID
+ *              handler         - Address of the handler
+ *              setup           - Address of the setup function
+ *              context         - Value passed to the handler on each access
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for all op_regions of a given space_id.
+ *              Assumes namespace is locked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_install_space_handler(struct acpi_namespace_node *node,
+			      acpi_adr_space_type space_id,
+			      acpi_adr_space_handler handler,
+			      acpi_adr_space_setup setup, void *context)
+{
+	union acpi_operand_object *obj_desc;
+	union acpi_operand_object *handler_obj;
+	acpi_status status = AE_OK;
+	acpi_object_type type;
+	u8 flags = 0;
+
+	ACPI_FUNCTION_TRACE(ev_install_space_handler);
+
+	/*
+	 * This registration is valid for only the types below and the root.
+	 * The root node is where the default handlers get installed.
+	 */
+	if ((node->type != ACPI_TYPE_DEVICE) &&
+	    (node->type != ACPI_TYPE_PROCESSOR) &&
+	    (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (handler == ACPI_DEFAULT_HANDLER) {
+		flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
+
+		switch (space_id) {
+		case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+
+			handler = acpi_ex_system_memory_space_handler;
+			setup = acpi_ev_system_memory_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_SYSTEM_IO:
+
+			handler = acpi_ex_system_io_space_handler;
+			setup = acpi_ev_io_space_region_setup;
+			break;
+#ifdef ACPI_PCI_CONFIGURED
+		case ACPI_ADR_SPACE_PCI_CONFIG:
+
+			handler = acpi_ex_pci_config_space_handler;
+			setup = acpi_ev_pci_config_region_setup;
+			break;
+#endif
+		case ACPI_ADR_SPACE_CMOS:
+
+			handler = acpi_ex_cmos_space_handler;
+			setup = acpi_ev_cmos_region_setup;
+			break;
+#ifdef ACPI_PCI_CONFIGURED
+		case ACPI_ADR_SPACE_PCI_BAR_TARGET:
+
+			handler = acpi_ex_pci_bar_space_handler;
+			setup = acpi_ev_pci_bar_region_setup;
+			break;
+#endif
+		case ACPI_ADR_SPACE_DATA_TABLE:
+
+			handler = acpi_ex_data_table_space_handler;
+			setup = acpi_ev_data_table_region_setup;
+			break;
+
+		default:
+
+			status = AE_BAD_PARAMETER;
+			goto unlock_and_exit;
+		}
+	}
+
+	/* If the caller hasn't specified a setup routine, use the default */
+
+	if (!setup) {
+		setup = acpi_ev_default_region_setup;
+	}
+
+	/* Check for an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object(node);
+	if (obj_desc) {
+		/*
+		 * The attached device object already exists. Now make sure
+		 * the handler is not already installed.
+		 */
+		handler_obj = acpi_ev_find_region_handler(space_id,
+							  obj_desc->
+							  common_notify.
+							  handler);
+
+		if (handler_obj) {
+			if (handler_obj->address_space.handler == handler) {
+				/*
+				 * It is (relatively) OK to attempt to install the SAME
+				 * handler twice. This can easily happen with the
+				 * PCI_Config space.
+				 */
+				status = AE_SAME_HANDLER;
+				goto unlock_and_exit;
+			} else {
+				/* A handler is already installed */
+
+				status = AE_ALREADY_EXISTS;
+			}
+
+			goto unlock_and_exit;
+		}
+	} else {
+		ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
+				  "Creating object on Device %p while installing handler\n",
+				  node));
+
+		/* obj_desc does not exist, create one */
+
+		if (node->type == ACPI_TYPE_ANY) {
+			type = ACPI_TYPE_DEVICE;
+		} else {
+			type = node->type;
+		}
+
+		obj_desc = acpi_ut_create_internal_object(type);
+		if (!obj_desc) {
+			status = AE_NO_MEMORY;
+			goto unlock_and_exit;
+		}
+
+		/* Init new descriptor */
+
+		obj_desc->common.type = (u8)type;
+
+		/* Attach the new object to the Node */
+
+		status = acpi_ns_attach_object(node, obj_desc, type);
+
+		/* Remove local reference to the object */
+
+		acpi_ut_remove_reference(obj_desc);
+
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
+			  "Installing address handler for region %s(%X) "
+			  "on Device %4.4s %p(%p)\n",
+			  acpi_ut_get_region_name(space_id), space_id,
+			  acpi_ut_get_node_name(node), node, obj_desc));
+
+	/*
+	 * Install the handler
+	 *
+	 * At this point there is no existing handler. Just allocate the object
+	 * for the handler and link it into the list.
+	 */
+	handler_obj =
+	    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
+	if (!handler_obj) {
+		status = AE_NO_MEMORY;
+		goto unlock_and_exit;
+	}
+
+	/* Init handler obj */
+
+	status =
+	    acpi_os_create_mutex(&handler_obj->address_space.context_mutex);
+	if (ACPI_FAILURE(status)) {
+		acpi_ut_remove_reference(handler_obj);
+		goto unlock_and_exit;
+	}
+
+	handler_obj->address_space.space_id = (u8)space_id;
+	handler_obj->address_space.handler_flags = flags;
+	handler_obj->address_space.region_list = NULL;
+	handler_obj->address_space.node = node;
+	handler_obj->address_space.handler = handler;
+	handler_obj->address_space.context = context;
+	handler_obj->address_space.setup = setup;
+
+	/* Install at head of Device.address_space list */
+
+	handler_obj->address_space.next = obj_desc->common_notify.handler;
+
+	/*
+	 * The Device object is the first reference on the handler_obj.
+	 * Each region that uses the handler adds a reference.
+	 */
+	obj_desc->common_notify.handler = handler_obj;
+
+	/*
+	 * Walk the namespace finding all of the regions this handler will
+	 * manage.
+	 *
+	 * Start at the device and search the branch toward the leaf nodes
+	 * until either the leaf is encountered or a device is detected that
+	 * has an address handler of the same type.
+	 *
+	 * In either case, back up and search down the remainder of the branch
+	 */
+	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node,
+					ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
+					acpi_ev_install_handler, NULL,
+					handler_obj, NULL);
+
+unlock_and_exit:
+	return_ACPI_STATUS(status);
+}