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, 446 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
new file mode 100644
index 000000000..17ad9c227
--- /dev/null
+++ b/drivers/acpi/acpica/tbutils.c
@@ -0,0 +1,446 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: tbutils - ACPI Table utilities
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbutils")
+
+/* Local prototypes */
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
+
+#if (!ACPI_REDUCED_HARDWARE)
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_initialize_facs
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
+ *              for accessing the Global Lock and Firmware Waking Vector
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_initialize_facs(void)
+{
+	struct acpi_table_facs *facs;
+
+	/* If Hardware Reduced flag is set, there is no FACS */
+
+	if (acpi_gbl_reduced_hardware) {
+		acpi_gbl_FACS = NULL;
+		return (AE_OK);
+	} else if (acpi_gbl_FADT.Xfacs &&
+		   (!acpi_gbl_FADT.facs
+		    || !acpi_gbl_use32_bit_facs_addresses)) {
+		(void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
+					      ACPI_CAST_INDIRECT_PTR(struct
+								     acpi_table_header,
+								     &facs));
+		acpi_gbl_FACS = facs;
+	} else if (acpi_gbl_FADT.facs) {
+		(void)acpi_get_table_by_index(acpi_gbl_facs_index,
+					      ACPI_CAST_INDIRECT_PTR(struct
+								     acpi_table_header,
+								     &facs));
+		acpi_gbl_FACS = facs;
+	}
+
+	/* If there is no FACS, just continue. There was already an error msg */
+
+	return (AE_OK);
+}
+#endif				/* !ACPI_REDUCED_HARDWARE */
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_check_dsdt_header
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
+ *              if the DSDT has been replaced from outside the OS and/or if
+ *              the DSDT header has been corrupted.
+ *
+ ******************************************************************************/
+
+void acpi_tb_check_dsdt_header(void)
+{
+
+	/* Compare original length and checksum to current values */
+
+	if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
+	    acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
+		ACPI_BIOS_ERROR((AE_INFO,
+				 "The DSDT has been corrupted or replaced - "
+				 "old, new headers below"));
+
+		acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
+		acpi_tb_print_table_header(0, acpi_gbl_DSDT);
+
+		ACPI_ERROR((AE_INFO,
+			    "Please send DMI info to linux-acpi@vger.kernel.org\n"
+			    "If system does not work as expected, please boot with acpi=copy_dsdt"));
+
+		/* Disable further error messages */
+
+		acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
+		acpi_gbl_original_dsdt_header.checksum =
+		    acpi_gbl_DSDT->checksum;
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_copy_dsdt
+ *
+ * PARAMETERS:  table_index         - Index of installed table to copy
+ *
+ * RETURN:      The copied DSDT
+ *
+ * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
+ *              Some very bad BIOSs are known to either corrupt the DSDT or
+ *              install a new, bad DSDT. This copy works around the problem.
+ *
+ ******************************************************************************/
+
+struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
+{
+	struct acpi_table_header *new_table;
+	struct acpi_table_desc *table_desc;
+
+	table_desc = &acpi_gbl_root_table_list.tables[table_index];
+
+	new_table = ACPI_ALLOCATE(table_desc->length);
+	if (!new_table) {
+		ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
+			    table_desc->length));
+		return (NULL);
+	}
+
+	memcpy(new_table, table_desc->pointer, table_desc->length);
+	acpi_tb_uninstall_table(table_desc);
+
+	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
+				      tables[acpi_gbl_dsdt_index],
+				      ACPI_PTR_TO_PHYSADDR(new_table),
+				      ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
+				      new_table);
+
+	ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", new_table->length));
+
+	return (new_table);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_root_table_entry
+ *
+ * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
+ *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
+ *
+ * RETURN:      Physical address extracted from the root table
+ *
+ * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
+ *              both 32-bit and 64-bit platforms
+ *
+ * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
+ *              64-bit platforms.
+ *
+ ******************************************************************************/
+
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
+{
+	u64 address64;
+
+	/*
+	 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
+	 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
+	 */
+	if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
+		/*
+		 * 32-bit platform, RSDT: Return 32-bit table entry
+		 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
+		 */
+		return ((acpi_physical_address)
+			(*ACPI_CAST_PTR(u32, table_entry)));
+	} else {
+		/*
+		 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
+		 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
+		 *  return 64-bit
+		 */
+		ACPI_MOVE_64_TO_64(&address64, table_entry);
+
+#if ACPI_MACHINE_WIDTH == 32
+		if (address64 > ACPI_UINT32_MAX) {
+
+			/* Will truncate 64-bit address to 32 bits, issue warning */
+
+			ACPI_BIOS_WARNING((AE_INFO,
+					   "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
+					   " truncating",
+					   ACPI_FORMAT_UINT64(address64)));
+		}
+#endif
+		return ((acpi_physical_address)(address64));
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_parse_root_table
+ *
+ * PARAMETERS:  rsdp_address        - Pointer to the RSDP
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to parse the Root System Description
+ *              Table (RSDT or XSDT)
+ *
+ * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
+ *              be mapped and cannot be copied because it contains the actual
+ *              memory location of the ACPI Global Lock.
+ *
+ ******************************************************************************/
+
+acpi_status ACPI_INIT_FUNCTION
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
+{
+	struct acpi_table_rsdp *rsdp;
+	u32 table_entry_size;
+	u32 i;
+	u32 table_count;
+	struct acpi_table_header *table;
+	acpi_physical_address address;
+	u32 length;
+	u8 *table_entry;
+	acpi_status status;
+	u32 table_index;
+
+	ACPI_FUNCTION_TRACE(tb_parse_root_table);
+
+	/* Map the entire RSDP and extract the address of the RSDT or XSDT */
+
+	rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
+	if (!rsdp) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	acpi_tb_print_table_header(rsdp_address,
+				   ACPI_CAST_PTR(struct acpi_table_header,
+						 rsdp));
+
+	/* Use XSDT if present and not overridden. Otherwise, use RSDT */
+
+	if ((rsdp->revision > 1) &&
+	    rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
+		/*
+		 * RSDP contains an XSDT (64-bit physical addresses). We must use
+		 * the XSDT if the revision is > 1 and the XSDT pointer is present,
+		 * as per the ACPI specification.
+		 */
+		address = (acpi_physical_address)rsdp->xsdt_physical_address;
+		table_entry_size = ACPI_XSDT_ENTRY_SIZE;
+	} else {
+		/* Root table is an RSDT (32-bit physical addresses) */
+
+		address = (acpi_physical_address)rsdp->rsdt_physical_address;
+		table_entry_size = ACPI_RSDT_ENTRY_SIZE;
+	}
+
+	/*
+	 * It is not possible to map more than one entry in some environments,
+	 * so unmap the RSDP here before mapping other tables
+	 */
+	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
+
+	/* Map the RSDT/XSDT table header to get the full table length */
+
+	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+	if (!table) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	acpi_tb_print_table_header(address, table);
+
+	/*
+	 * Validate length of the table, and map entire table.
+	 * Minimum length table must contain at least one entry.
+	 */
+	length = table->length;
+	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+
+	if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
+		ACPI_BIOS_ERROR((AE_INFO,
+				 "Invalid table length 0x%X in RSDT/XSDT",
+				 length));
+		return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+	}
+
+	table = acpi_os_map_memory(address, length);
+	if (!table) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	/* Validate the root table checksum */
+
+	status = acpi_ut_verify_checksum(table, length);
+	if (ACPI_FAILURE(status)) {
+		acpi_os_unmap_memory(table, length);
+		return_ACPI_STATUS(status);
+	}
+
+	/* Get the number of entries and pointer to first entry */
+
+	table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
+			    table_entry_size);
+	table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
+
+	/* Initialize the root table array from the RSDT/XSDT */
+
+	for (i = 0; i < table_count; i++) {
+
+		/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
+
+		address =
+		    acpi_tb_get_root_table_entry(table_entry, table_entry_size);
+
+		/* Skip NULL entries in RSDT/XSDT */
+
+		if (!address) {
+			goto next_table;
+		}
+
+		status = acpi_tb_install_standard_table(address,
+							ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
+							NULL, FALSE, TRUE,
+							&table_index);
+
+		if (ACPI_SUCCESS(status) &&
+		    ACPI_COMPARE_NAMESEG(&acpi_gbl_root_table_list.
+					 tables[table_index].signature,
+					 ACPI_SIG_FADT)) {
+			acpi_gbl_fadt_index = table_index;
+			acpi_tb_parse_fadt();
+		}
+
+next_table:
+
+		table_entry += table_entry_size;
+	}
+
+	acpi_os_unmap_memory(table, length);
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table
+ *
+ * PARAMETERS:  table_desc          - Table descriptor
+ *              out_table           - Where the pointer to the table is returned
+ *
+ * RETURN:      Status and pointer to the requested table
+ *
+ * DESCRIPTION: Increase a reference to a table descriptor and return the
+ *              validated table pointer.
+ *              If the table descriptor is an entry of the root table list,
+ *              this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table(struct acpi_table_desc *table_desc,
+		  struct acpi_table_header **out_table)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_tb_get_table);
+
+	if (table_desc->validation_count == 0) {
+
+		/* Table need to be "VALIDATED" */
+
+		status = acpi_tb_validate_table(table_desc);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+		table_desc->validation_count++;
+
+		/*
+		 * Detect validation_count overflows to ensure that the warning
+		 * message will only be printed once.
+		 */
+		if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+			ACPI_WARNING((AE_INFO,
+				      "Table %p, Validation count overflows\n",
+				      table_desc));
+		}
+	}
+
+	*out_table = table_desc->pointer;
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_put_table
+ *
+ * PARAMETERS:  table_desc          - Table descriptor
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Decrease a reference to a table descriptor and release the
+ *              validated table pointer if no references.
+ *              If the table descriptor is an entry of the root table list,
+ *              this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+void acpi_tb_put_table(struct acpi_table_desc *table_desc)
+{
+
+	ACPI_FUNCTION_TRACE(acpi_tb_put_table);
+
+	if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+		table_desc->validation_count--;
+
+		/*
+		 * Detect validation_count underflows to ensure that the warning
+		 * message will only be printed once.
+		 */
+		if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+			ACPI_WARNING((AE_INFO,
+				      "Table %p, Validation count underflows\n",
+				      table_desc));
+			return_VOID;
+		}
+	}
+
+	if (table_desc->validation_count == 0) {
+
+		/* Table need to be "INVALIDATED" */
+
+		acpi_tb_invalidate_table(table_desc);
+	}
+
+	return_VOID;
+}