Change in coreboot[master]: x86/acpigen: Fix ACPI _ROM method

[Marc Jones (Code Review)]

Marc Jones has uploaded this change for review. ( https://review.coreboot.org/28124

Change subject: x86/acpigen: Fix ACPI _ROM method
......................................................................

x86/acpigen: Fix ACPI _ROM method

Fix the following Error:
FAILED [LOW] AMLAsmASL_MSG_SERIALIZED_REQUIRED: Test 1, Assembler remark in line
142
Line | AML source
--------------------------------------------------------------------------------
00139|
00140|     Scope (_SB.PCI0.IGFX)
00141|     {
00142|         Method (_ROM, 2, NotSerialized)  // _ROM: Read-Only Memory
     |                   ^
     | Remark 2120: Control Method should be made Serialized    (due to creation of named objects within)
00143|         {
00144|             OperationRegion (ROMS, SystemMemory, 0xCD520000, 0xFE00)
00145|             Field (ROMS, AnyAcc, NoLock, Preserve)
================================================================================

ADVICE: (for Remark #2120, ASL_MSG_SERIALIZED_REQUIRED): A named object is
created inside a non-serialized method - this method should be serialized. It is
possible that one thread enters the method and blocks and then a second thread
also executes the method, ending up in two attempts to create the object and
causing a failure.

Use the acpigen_write_method_serialized() to correct the error.

BUG=b:112476331
TEST=Run FWTS.

Change-Id: I145c3c3103efb4a02b4e02dd177f4bf50a2c7b3e
Signed-off-by: Marc Jones 
---
M src/arch/x86/acpigen.c
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/24/28124/1

diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index a614efb..c842cca 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -1405,7 +1405,7 @@
    ASSERT(length)

/* Method (_ROM, 2, NotSerialized) */
-	acpigen_write_method("_ROM", 2);
+	acpigen_write_method_serialized("_ROM", 2);

/* OperationRegion("ROMS", SYSTEMMEMORY, current, length) */
    struct opregion opreg = OPREGION("ROMS", SYSTEMMEMORY,