diff options
Diffstat (limited to 'drivers/acpi/acpica/exstorob.c')
| -rw-r--r-- | drivers/acpi/acpica/exstorob.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c index 67340cc7014..fd11018b016 100644 --- a/drivers/acpi/acpica/exstorob.c +++ b/drivers/acpi/acpica/exstorob.c @@ -1,4 +1,3 @@ - /****************************************************************************** * * Module Name: exstorob - AML Interpreter object store support, store to object @@ -6,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2008, Intel Corp. + * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -70,6 +69,12 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, 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); @@ -102,16 +107,16 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, #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" + * truncated if the string is smaller than the buffer. However, "other" * implementations of ACPI never did this and thus became the defacto - * standard. ACPI 3.0_a changes this behavior such that the buffer + * 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 + * 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) { @@ -161,6 +166,12 @@ acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, 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); |