cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/exstorob.c

/******************************************************************************
 *
 * Module Name: exstorob - AML object store support, store to object
 *
 *****************************************************************************/

/*
 * 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"


#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exstorob")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_buffer_to_buffer
 *
 * PARAMETERS:  source_desc         - Source object to copy
 *              target_desc         - Destination object of the copy
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy a buffer object to another buffer object.
 *
 ******************************************************************************/

acpi_status acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, union acpi_operand_object *target_desc) { u32 length; u8 *buffer; ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc); /* If Source and Target are the same, just return */ if (source_desc == target_desc) { return_ACPI_STATUS(AE_OK); } /* We know that source_desc is a buffer by now */ buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); length = source_desc->buffer.length; /* * If target is a buffer of length zero or is a static buffer, * allocate a new buffer of the proper length */ if ((target_desc->buffer.length == 0) || (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { target_desc->buffer.pointer = ACPI_ALLOCATE(length); if (!target_desc->buffer.pointer) { return_ACPI_STATUS(AE_NO_MEMORY); } target_desc->buffer.length = length; } /* Copy source buffer to target buffer */ if (length <= target_desc->buffer.length) { /* Clear existing buffer and copy in the new one */ memset(target_desc->buffer.pointer, 0, target_desc->buffer.length); memcpy(target_desc->buffer.pointer, buffer, length); #ifdef ACPI_OBSOLETE_BEHAVIOR /* * NOTE: ACPI versions up to 3.0 specified that the buffer must be * truncated if the string is smaller than the buffer. However, "other" * implementations of ACPI never did this and thus became the defacto * standard. ACPI 3.0A changes this behavior such that the buffer * is no longer truncated. */ /* * OBSOLETE BEHAVIOR: * If the original source was a string, we must truncate the buffer, * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer * copy must not truncate the original buffer. */ if (original_src_type == ACPI_TYPE_STRING) { /* Set the new length of the target */ target_desc->buffer.length = length; } #endif } else { /* Truncate the source, copy only what will fit */ memcpy(target_desc->buffer.pointer, buffer, target_desc->buffer.length); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Truncating source buffer from %X to %X\n", length, target_desc->buffer.length)); } /* Copy flags */ target_desc->buffer.flags = source_desc->buffer.flags; target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds15861.24%211.76%
Andy Grover4015.50%529.41%
Len Brown3513.57%423.53%
Lin Ming145.43%15.88%
Robert Moore114.26%529.41%
Total258100.00%17100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_store_string_to_string * * PARAMETERS: source_desc - Source object to copy * target_desc - Destination object of the copy * * RETURN: Status * * DESCRIPTION: Copy a String object to another String object * ******************************************************************************/
acpi_status acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, union acpi_operand_object *target_desc) { u32 length; u8 *buffer; ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); /* If Source and Target are the same, just return */ if (source_desc == target_desc) { return_ACPI_STATUS(AE_OK); } /* We know that source_desc is a string by now */ buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); length = source_desc->string.length; /* * Replace existing string value if it will fit and the string * pointer is not a static pointer (part of an ACPI table) */ if ((length < target_desc->string.length) && (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { /* * String will fit in existing non-static buffer. * Clear old string and copy in the new one */ memset(target_desc->string.pointer, 0, (acpi_size)target_desc->string.length + 1); memcpy(target_desc->string.pointer, buffer, length); } else { /* * Free the current buffer, then allocate a new buffer * large enough to hold the value */ if (target_desc->string.pointer && (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { /* Only free if not a pointer into the DSDT */ ACPI_FREE(target_desc->string.pointer); } target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size)length + 1); if (!target_desc->string.pointer) { return_ACPI_STATUS(AE_NO_MEMORY); } target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; memcpy(target_desc->string.pointer, buffer, length); } /* Set the new target length */ target_desc->string.length = length; return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds14863.25%212.50%
Andy Grover6025.64%850.00%
Lin Ming145.98%16.25%
Robert Moore104.27%425.00%
Len Brown20.85%16.25%
Total234100.00%16100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds31761.79%27.41%
Andy Grover10320.08%1037.04%
Len Brown397.60%518.52%
Lin Ming285.46%13.70%
Robert Moore254.87%829.63%
Patrick Mochel10.19%13.70%
Total513100.00%27100.00%
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