cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/utdelete.c

/*******************************************************************************
 *
 * Module Name: utdelete - object deletion and reference count utilities
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"


#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utdelete")

/* Local prototypes */
static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);

static void
acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_internal_obj
 *
 * PARAMETERS:  object         - Object to be deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: Low level object deletion, after reference counts have been
 *              updated (All reference counts, including sub-objects!)
 *
 ******************************************************************************/


static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) { void *obj_pointer = NULL; union acpi_operand_object *handler_desc; union acpi_operand_object *second_desc; union acpi_operand_object *next_desc; union acpi_operand_object *start_desc; union acpi_operand_object **last_obj_ptr; ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object); if (!object) { return_VOID; } /* * Must delete or free any pointers within the object that are not * actual ACPI objects (for example, a raw buffer pointer). */ switch (object->common.type) { case ACPI_TYPE_STRING: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n", object, object->string.pointer)); /* Free the actual string buffer */ if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { /* But only if it is NOT a pointer into an ACPI table */ obj_pointer = object->string.pointer; } break; case ACPI_TYPE_BUFFER: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n", object, object->buffer.pointer)); /* Free the actual buffer */ if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { /* But only if it is NOT a pointer into an ACPI table */ obj_pointer = object->buffer.pointer; } break; case ACPI_TYPE_PACKAGE: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n", object->package.count)); /* * Elements of the package are not handled here, they are deleted * separately */ /* Free the (variable length) element pointer array */ obj_pointer = object->package.elements; break; /* * These objects have a possible list of notify handlers. * Device object also may have a GPE block. */ case ACPI_TYPE_DEVICE: if (object->device.gpe_block) { (void)acpi_ev_delete_gpe_block(object->device. gpe_block); } /*lint -fallthrough */ case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_THERMAL: /* Walk the address handler list for this object */ handler_desc = object->common_notify.handler; while (handler_desc) { next_desc = handler_desc->address_space.next; acpi_ut_remove_reference(handler_desc); handler_desc = next_desc; } break; case ACPI_TYPE_MUTEX: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Mutex %p, OS Mutex %p\n", object, object->mutex.os_mutex)); if (object == acpi_gbl_global_lock_mutex) { /* Global Lock has extra semaphore */ (void) acpi_os_delete_semaphore (acpi_gbl_global_lock_semaphore); acpi_gbl_global_lock_semaphore = NULL; acpi_os_delete_mutex(object->mutex.os_mutex); acpi_gbl_global_lock_mutex = NULL; } else { acpi_ex_unlink_mutex(object); acpi_os_delete_mutex(object->mutex.os_mutex); } break; case ACPI_TYPE_EVENT: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Event %p, OS Semaphore %p\n", object, object->event.os_semaphore)); (void)acpi_os_delete_semaphore(object->event.os_semaphore); object->event.os_semaphore = NULL; break; case ACPI_TYPE_METHOD: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Method %p\n", object)); /* Delete the method mutex if it exists */ if (object->method.mutex) { acpi_os_delete_mutex(object->method.mutex->mutex. os_mutex); acpi_ut_delete_object_desc(object->method.mutex); object->method.mutex = NULL; } if (object->method.node) { object->method.node = NULL; } break; case ACPI_TYPE_REGION: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Region %p\n", object)); /* * Update address_range list. However, only permanent regions * are installed in this list. (Not created within a method) */ if (!(object->region.node->flags & ANOBJ_TEMPORARY)) { acpi_ut_remove_address_range(object->region.space_id, object->region.node); } second_desc = acpi_ns_get_secondary_object(object); if (second_desc) { /* * Free the region_context if and only if the handler is one of the * default handlers -- and therefore, we created the context object * locally, it was not created by an external caller. */ handler_desc = object->region.handler; if (handler_desc) { next_desc = handler_desc->address_space.region_list; start_desc = next_desc; last_obj_ptr = &handler_desc->address_space.region_list; /* Remove the region object from the handler list */ while (next_desc) { if (next_desc == object) { *last_obj_ptr = next_desc->region.next; break; } /* Walk the linked list of handlers */ last_obj_ptr = &next_desc->region.next; next_desc = next_desc->region.next; /* Prevent infinite loop if list is corrupted */ if (next_desc == start_desc) { ACPI_ERROR((AE_INFO, "Circular region list in address handler object %p", handler_desc)); return_VOID; } } if (handler_desc->address_space.handler_flags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { /* Deactivate region and free region context */ if (handler_desc->address_space.setup) { (void)handler_desc-> address_space.setup(object, ACPI_REGION_DEACTIVATE, handler_desc-> address_space. context, &second_desc-> extra. region_context); } } acpi_ut_remove_reference(handler_desc); } /* Now we can free the Extra object */ acpi_ut_delete_object_desc(second_desc); } break; case ACPI_TYPE_BUFFER_FIELD: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Buffer Field %p\n", object)); second_desc = acpi_ns_get_secondary_object(object); if (second_desc) { acpi_ut_delete_object_desc(second_desc); } break; case ACPI_TYPE_LOCAL_BANK_FIELD: ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "***** Bank Field %p\n", object)); second_desc = acpi_ns_get_secondary_object(object); if (second_desc) { acpi_ut_delete_object_desc(second_desc); } break; default: break; } /* Free any allocated memory (pointer within the object) found above */ if (obj_pointer) { ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n", obj_pointer)); ACPI_FREE(obj_pointer); } /* Now the object can be safely deleted */ ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n", object, acpi_ut_get_object_type_name(object))); acpi_ut_delete_object_desc(object); return_VOID; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)18824.04%26.45%
Linus Torvalds16020.46%26.45%
Robert Moore14318.29%1135.48%
Andy Grover13617.39%929.03%
Lin Ming13016.62%412.90%
Lv Zheng182.30%13.23%
Len Brown70.90%26.45%
Total782100.00%31100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_delete_internal_object_list * * PARAMETERS: obj_list - Pointer to the list to be deleted * * RETURN: None * * DESCRIPTION: This function deletes an internal object list, including both * simple objects and package objects * ******************************************************************************/
void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list) { union acpi_operand_object **internal_obj; ACPI_FUNCTION_ENTRY(); /* Walk the null-terminated internal list */ for (internal_obj = obj_list; *internal_obj; internal_obj++) { acpi_ut_remove_reference(*internal_obj); } /* Free the combined parameter pointer list and object array */ ACPI_FREE(obj_list); return; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3675.00%112.50%
Linus Torvalds510.42%225.00%
Robert Moore48.33%337.50%
Andy Grover24.17%112.50%
Len Brown12.08%112.50%
Total48100.00%8100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_update_ref_count * * PARAMETERS: object - Object whose ref count is to be updated * action - What to do (REF_INCREMENT or REF_DECREMENT) * * RETURN: None. Sets new reference count within the object * * DESCRIPTION: Modify the reference count for an internal acpi object * ******************************************************************************/
static void acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action) { u16 original_count; u16 new_count = 0; acpi_cpu_flags lock_flags; ACPI_FUNCTION_NAME(ut_update_ref_count); if (!object) { return; } /* * Always get the reference count lock. Note: Interpreter and/or * Namespace is not always locked when this function is called. */ lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock); original_count = object->common.reference_count; /* Perform the reference count action (increment, decrement) */ switch (action) { case REF_INCREMENT: new_count = original_count + 1; object->common.reference_count = new_count; acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); /* The current reference count should never be zero here */ if (!original_count) { ACPI_WARNING((AE_INFO, "Obj %p, Reference Count was zero before increment\n", object)); } ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Obj %p Type %.2X [%s] Refs %.2X [Incremented]\n", object, object->common.type, acpi_ut_get_object_type_name(object), new_count)); break; case REF_DECREMENT: /* The current reference count must be non-zero */ if (original_count) { new_count = original_count - 1; object->common.reference_count = new_count; } acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); if (!original_count) { ACPI_WARNING((AE_INFO, "Obj %p, Reference Count is already zero, cannot decrement\n", object)); } ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Obj %p Type %.2X Refs %.2X [Decremented]\n", object, object->common.type, new_count)); /* Actually delete the object on a reference count of zero */ if (new_count == 0) { acpi_ut_delete_internal_obj(object); } break; default: acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)", action)); return; } /* * Sanity check the reference count, for debug purposes only. * (A deleted object will have a huge reference count) */ if (new_count > ACPI_MAX_REFERENCE_COUNT) { ACPI_WARNING((AE_INFO, "Large Reference Count (0x%X) in object %p, Type=0x%.2X", new_count, object, object->common.type)); } }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore11745.00%535.71%
Linus Torvalds (pre-git)7729.62%321.43%
Linus Torvalds6223.85%214.29%
Andy Grover41.54%428.57%
Total260100.00%14100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_update_object_reference * * PARAMETERS: object - Increment ref count for this object * and all sub-objects * action - Either REF_INCREMENT or REF_DECREMENT * * RETURN: Status * * DESCRIPTION: Increment the object reference count * * Object references are incremented when: * 1) An object is attached to a Node (namespace object) * 2) An object is copied (all subobjects must be incremented) * * Object references are decremented when: * 1) An object is detached from an Node * ******************************************************************************/
acpi_status acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action) { acpi_status status = AE_OK; union acpi_generic_state *state_list = NULL; union acpi_operand_object *next_object = NULL; union acpi_operand_object *prev_object; union acpi_generic_state *state; u32 i; ACPI_FUNCTION_NAME(ut_update_object_reference); while (object) { /* Make sure that this isn't a namespace handle */ if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) { ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Object %p is NS handle\n", object)); return (AE_OK); } /* * All sub-objects must have their reference count incremented * also. Different object types have different subobjects. */ switch (object->common.type) { case ACPI_TYPE_DEVICE: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_POWER: case ACPI_TYPE_THERMAL: /* * Update the notify objects for these types (if present) * Two lists, system and device notify handlers. */ for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { prev_object = object->common_notify.notify_list[i]; while (prev_object) { next_object = prev_object->notify.next[i]; acpi_ut_update_ref_count(prev_object, action); prev_object = next_object; } } break; case ACPI_TYPE_PACKAGE: /* * We must update all the sub-objects of the package, * each of whom may have their own sub-objects. */ for (i = 0; i < object->package.count; i++) { /* * Null package elements are legal and can be simply * ignored. */ next_object = object->package.elements[i]; if (!next_object) { continue; } switch (next_object->common.type) { case ACPI_TYPE_INTEGER: case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: /* * For these very simple sub-objects, we can just * update the reference count here and continue. * Greatly increases performance of this operation. */ acpi_ut_update_ref_count(next_object, action); break; default: /* * For complex sub-objects, push them onto the stack * for later processing (this eliminates recursion.) */ status = acpi_ut_create_update_state_and_push (next_object, action, &state_list); if (ACPI_FAILURE(status)) { goto error_exit; } break; } } next_object = NULL; break; case ACPI_TYPE_BUFFER_FIELD: next_object = object->buffer_field.buffer_obj; break; case ACPI_TYPE_LOCAL_REGION_FIELD: next_object = object->field.region_obj; break; case ACPI_TYPE_LOCAL_BANK_FIELD: next_object = object->bank_field.bank_obj; status = acpi_ut_create_update_state_and_push(object-> bank_field. region_obj, action, &state_list); if (ACPI_FAILURE(status)) { goto error_exit; } break; case ACPI_TYPE_LOCAL_INDEX_FIELD: next_object = object->index_field.index_obj; status = acpi_ut_create_update_state_and_push(object-> index_field. data_obj, action, &state_list); if (ACPI_FAILURE(status)) { goto error_exit; } break; case ACPI_TYPE_LOCAL_REFERENCE: /* * The target of an Index (a package, string, or buffer) or a named * reference must track changes to the ref count of the index or * target object. */ if ((object->reference.class == ACPI_REFCLASS_INDEX) || (object->reference.class == ACPI_REFCLASS_NAME)) { next_object = object->reference.object; } break; case ACPI_TYPE_REGION: default: break; /* No subobjects for all other types */ } /* * Now we can update the count in the main object. This can only * happen after we update the sub-objects in case this causes the * main object to be deleted. */ acpi_ut_update_ref_count(object, action); object = NULL; /* Move on to the next object to be updated */ if (next_object) { object = next_object; next_object = NULL; } else if (state_list) { state = acpi_ut_pop_generic_state(&state_list); object = state->update.object; acpi_ut_delete_generic_state(state); } } return (AE_OK); error_exit: ACPI_EXCEPTION((AE_INFO, status, "Could not update object reference count")); /* Free any stacked Update State objects */ while (state_list) { state = acpi_ut_pop_generic_state(&state_list); acpi_ut_delete_generic_state(state); } return (status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16732.68%14.00%
Robert Moore15630.53%1248.00%
Linus Torvalds6111.94%28.00%
Chao Guan519.98%14.00%
Andy Grover326.26%624.00%
Len Brown244.70%28.00%
Lin Ming203.91%14.00%
Total511100.00%25100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_add_reference * * PARAMETERS: object - Object whose reference count is to be * incremented * * RETURN: None * * DESCRIPTION: Add one reference to an ACPI object * ******************************************************************************/
void acpi_ut_add_reference(union acpi_operand_object *object) { ACPI_FUNCTION_NAME(ut_add_reference); /* Ensure that we have a valid object */ if (!acpi_ut_valid_internal_object(object)) { return; } ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Obj %p Current Refs=%X [To Be Incremented]\n", object, object->common.reference_count)); /* Increment the reference count */ (void)acpi_ut_update_object_reference(object, REF_INCREMENT); return; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2137.50%110.00%
Len Brown1832.14%220.00%
Linus Torvalds712.50%220.00%
Andy Grover610.71%330.00%
Robert Moore47.14%220.00%
Total56100.00%10100.00%

/******************************************************************************* * * FUNCTION: acpi_ut_remove_reference * * PARAMETERS: object - Object whose ref count will be decremented * * RETURN: None * * DESCRIPTION: Decrement the reference count of an ACPI internal object * ******************************************************************************/
void acpi_ut_remove_reference(union acpi_operand_object *object) { ACPI_FUNCTION_NAME(ut_remove_reference); /* * Allow a NULL pointer to be passed in, just ignore it. This saves * each caller from having to check. Also, ignore NS nodes. */ if (!object || (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) { return; } /* Ensure that we have a valid object */ if (!acpi_ut_valid_internal_object(object)) { return; } ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Obj %p Current Refs=%X [To Be Decremented]\n", object, object->common.reference_count)); /* * Decrement the reference count, and only actually delete the object * if the reference count becomes 0. (Must also decrement the ref count * of all subobjects!) */ (void)acpi_ut_update_object_reference(object, REF_DECREMENT); return; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3547.30%320.00%
Linus Torvalds (pre-git)2128.38%16.67%
Andy Grover912.16%533.33%
Robert Moore79.46%426.67%
Len Brown22.70%213.33%
Total74100.00%15100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)52129.17%35.00%
Robert Moore46425.98%2745.00%
Linus Torvalds33218.59%35.00%
Andy Grover19310.81%1220.00%
Lin Ming1508.40%58.33%
Len Brown563.14%711.67%
Chao Guan512.86%11.67%
Lv Zheng181.01%11.67%
Patrick Mochel10.06%11.67%
Total1786100.00%60100.00%
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