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>

diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c
index 67340cc70142209d1aa97ae360b21587cefc321b..257706e7734f786dbe8e8d760283ef2751859838 100644 (file)
--- a/drivers/acpi/acpica/exstorob.c
+++ b/drivers/acpi/acpica/exstorob.c
@@ -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);
 
+       /* 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);
@@ -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);
 
+       /* 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);