Check both pm2_control_block and cpm2_control_block for bm_control. It should
be better to do this with checking of address from consolidated
fadt_info_table[]. But, that will need some changes in acpica tables code.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Index: linux-2.6.22-rc-mm/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.22-rc-mm.orig/drivers/acpi/processor_core.c 2007-06-07 11:03:56.000000000 -0700
+++ linux-2.6.22-rc-mm/drivers/acpi/processor_core.c 2007-06-07 11:20:53.000000000 -0700
@@ -521,11 +521,22 @@
acpi_processor_errata(pr);
+ if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
+ /* FADT rev. 2 */
+ if (acpi_gbl_FADT.xpm_timer_block.space_id !=
+ ACPI_ADR_SPACE_SYSTEM_IO)
/*
* Check to see if we have bus mastering arbitration control. This
* is required for proper C3 usage (to maintain cache coherency).
+ * Check both pm2_control_block and xpm2_control_block
*/
- if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
+ if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+ acpi_gbl_FADT.xpm2_control_block.space_id ==
+ ACPI_ADR_SPACE_SYSTEM_IO &&
+ acpi_gbl_FADT.xpm2_control_block.address &&
+ acpi_gbl_FADT.xpm2_control_block.bit_width) ||
+ (acpi_gbl_FADT.pm2_control_block &&
+ acpi_gbl_FADT.pm2_control_length)) {
pr->flags.bm_control = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Bus mastering arbitration control present\n"));
-
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