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ACPICA: Windows compatibility fix: same buffer/string store 

Fix a compatibility issue when the same buffer or string is
stored to itself. This has been seen in the field. Previously,
ACPICA would zero out the buffer/string. Now, the operation is
treated as a NOP.

http://bugzilla.acpica.org/show_bug.cgi?id=803

Reported-by: Rezwanul Kabir <Rezwanul_Kabir@Dell.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2009-08-26 09:01:34 +08:00 committed by Len Brown
parent 326ba5010a
commit b0de22bdff
1 changed files with 12 additions and 0 deletions
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12
drivers/acpi/acpica/exstorob.c
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@ -70,6 +70,12 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, 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 */ /* We know that source_desc is a buffer by now */
buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
@ -161,6 +167,12 @@ acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, 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 */ /* We know that source_desc is a string by now */
buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);