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Commit b0de22bd authored by Lin Ming's avatar Lin Ming Committed by Len Brown
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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: default avatarRezwanul Kabir <Rezwanul_Kabir@Dell.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 326ba501

drivers/acpi/acpica/exstorob.c

+12 −0
Original line number Original line Diff line number Diff line
@@ -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);