cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/nswalk.c

/******************************************************************************
 *
 * Module Name: nswalk - Functions for walking the ACPI namespace
 *
 *****************************************************************************/

/*
 * 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 "acnamesp.h"


#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nswalk")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_next_node
 *
 * PARAMETERS:  parent_node         - Parent node whose children we are
 *                                    getting
 *              child_node          - Previous child that was found.
 *                                    The NEXT child will be returned
 *
 * RETURN:      struct acpi_namespace_node - Pointer to the NEXT child or NULL if
 *                                    none is found.
 *
 * DESCRIPTION: Return the next peer node within the namespace. If Handle
 *              is valid, Scope is ignored. Otherwise, the first node
 *              within Scope is returned.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_next_node(struct acpi_namespace_node *parent_node, struct acpi_namespace_node *child_node) { ACPI_FUNCTION_ENTRY(); if (!child_node) { /* It's really the parent's _scope_ that we want */ return (parent_node->child); } /* Otherwise just return the next peer */ return (child_node->peer); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2046.51%225.00%
Robert Moore920.93%112.50%
Linus Torvalds613.95%225.00%
Andy Grover49.30%225.00%
Lv Zheng49.30%112.50%
Total43100.00%8100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_get_next_node_typed * * PARAMETERS: type - Type of node to be searched for * parent_node - Parent node whose children we are * getting * child_node - Previous child that was found. * The NEXT child will be returned * * RETURN: struct acpi_namespace_node - Pointer to the NEXT child or NULL if * none is found. * * DESCRIPTION: Return the next peer node within the namespace. If Handle * is valid, Scope is ignored. Otherwise, the first node * within Scope is returned. * ******************************************************************************/
struct acpi_namespace_node *acpi_ns_get_next_node_typed(acpi_object_type type, struct acpi_namespace_node *parent_node, struct acpi_namespace_node *child_node) { struct acpi_namespace_node *next_node = NULL; ACPI_FUNCTION_ENTRY(); next_node = acpi_ns_get_next_node(parent_node, child_node); /* If any type is OK, we are done */ if (type == ACPI_TYPE_ANY) { /* next_node is NULL if we are at the end-of-list */ return (next_node); } /* Must search for the node -- but within this scope only */ while (next_node) { /* If type matches, we are done */ if (next_node->type == type) { return (next_node); } /* Otherwise, move on to the next peer node */ next_node = next_node->peer; } /* Not found */ return (NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5460.00%233.33%
Robert Moore3134.44%116.67%
Alexey Y. Starikovskiy33.33%116.67%
Andy Grover11.11%116.67%
Linus Torvalds11.11%116.67%
Total90100.00%6100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_walk_namespace * * PARAMETERS: type - acpi_object_type to search for * start_node - Handle in namespace where search begins * max_depth - Depth to which search is to reach * flags - Whether to unlock the NS before invoking * the callback routine * descending_callback - Called during tree descent * when an object of "Type" is found * ascending_callback - Called during tree ascent * when an object of "Type" is found * context - Passed to user function(s) above * return_value - from the user_function if terminated * early. Otherwise, returns NULL. * RETURNS: Status * * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, * starting (and ending) at the node specified by start_handle. * The callback function is called whenever a node that matches * the type parameter is found. If the callback function returns * a non-zero value, the search is terminated immediately and * this value is returned to the caller. * * The point of this procedure is to provide a generic namespace * walk routine that can be called from multiple places to * provide multiple services; the callback function(s) can be * tailored to each task, whether it is a print function, * a compare function, etc. * ******************************************************************************/
acpi_status acpi_ns_walk_namespace(acpi_object_type type, acpi_handle start_node, u32 max_depth, u32 flags, acpi_walk_callback descending_callback, acpi_walk_callback ascending_callback, void *context, void **return_value) { acpi_status status; acpi_status mutex_status; struct acpi_namespace_node *child_node; struct acpi_namespace_node *parent_node; acpi_object_type child_type; u32 level; u8 node_previously_visited = FALSE; ACPI_FUNCTION_TRACE(ns_walk_namespace); /* Special case for the namespace Root Node */ if (start_node == ACPI_ROOT_OBJECT) { start_node = acpi_gbl_root_node; } /* Null child means "get first node" */ parent_node = start_node; child_node = acpi_ns_get_next_node(parent_node, NULL); child_type = ACPI_TYPE_ANY; level = 1; /* * Traverse the tree of nodes until we bubble back up to where we * started. When Level is zero, the loop is done because we have * bubbled up to (and passed) the original parent handle (start_entry) */ while (level > 0 && child_node) { status = AE_OK; /* Found next child, get the type if we are not searching for ANY */ if (type != ACPI_TYPE_ANY) { child_type = child_node->type; } /* * Ignore all temporary namespace nodes (created during control * method execution) unless told otherwise. These temporary nodes * can cause a race condition because they can be deleted during * the execution of the user function (if the namespace is * unlocked before invocation of the user function.) Only the * debugger namespace dump will examine the temporary nodes. */ if ((child_node->flags & ANOBJ_TEMPORARY) && !(flags & ACPI_NS_WALK_TEMP_NODES)) { status = AE_CTRL_DEPTH; } /* Type must match requested type */ else if (child_type == type) { /* * Found a matching node, invoke the user callback function. * Unlock the namespace if flag is set. */ if (flags & ACPI_NS_WALK_UNLOCK) { mutex_status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(mutex_status)) { return_ACPI_STATUS(mutex_status); } } /* * Invoke the user function, either descending, ascending, * or both. */ if (!node_previously_visited) { if (descending_callback) { status = descending_callback(child_node, level, context, return_value); } } else { if (ascending_callback) { status = ascending_callback(child_node, level, context, return_value); } } if (flags & ACPI_NS_WALK_UNLOCK) { mutex_status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(mutex_status)) { return_ACPI_STATUS(mutex_status); } } switch (status) { case AE_OK: case AE_CTRL_DEPTH: /* Just keep going */ break; case AE_CTRL_TERMINATE: /* Exit now, with OK status */ return_ACPI_STATUS(AE_OK); default: /* All others are valid exceptions */ return_ACPI_STATUS(status); } } /* * Depth first search: Attempt to go down another level in the * namespace if we are allowed to. Don't go any further if we have * reached the caller specified maximum depth or if the user * function has specified that the maximum depth has been reached. */ if (!node_previously_visited && (level < max_depth) && (status != AE_CTRL_DEPTH)) { if (child_node->child) { /* There is at least one child of this node, visit it */ level++; parent_node = child_node; child_node = acpi_ns_get_next_node(parent_node, NULL); continue; } } /* No more children, re-visit this node */ if (!node_previously_visited) { node_previously_visited = TRUE; continue; } /* No more children, visit peers */ child_node = acpi_ns_get_next_node(parent_node, child_node); if (child_node) { node_previously_visited = FALSE; } /* No peers, re-visit parent */ else { /* * No more children of this node (acpi_ns_get_next_node failed), go * back upwards in the namespace tree to the node's parent. */ level--; child_node = parent_node; parent_node = parent_node->parent; node_previously_visited = TRUE; } } /* Complete walk, not terminated by user function */ return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)19547.79%210.53%
Lin Ming9423.04%15.26%
Robert Moore5012.25%736.84%
Andy Grover4110.05%421.05%
Linus Torvalds245.88%315.79%
Mika Kukkonen20.49%15.26%
Alexey Y. Starikovskiy20.49%15.26%
Total408100.00%19100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)27949.56%28.00%
Robert Moore9617.05%936.00%
Lin Ming9416.70%14.00%
Andy Grover488.53%520.00%
Linus Torvalds325.68%312.00%
Alexey Y. Starikovskiy50.89%14.00%
Lv Zheng40.71%14.00%
Mika Kukkonen20.36%14.00%
Len Brown20.36%14.00%
Patrick Mochel10.18%14.00%
Total563100.00%25100.00%
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