ACPI: fix "Time Problems with 2.6.23-rc1-gf695baf2"
Enable C3 without bm control only for CST based C3.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index a898991..a8634a0 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -969,11 +969,17 @@
}
if (pr->flags.bm_check) {
- /* bus mastering control is necessary */
if (!pr->flags.bm_control) {
- /* In this case we enter C3 without bus mastering */
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 support without bus mastering control\n"));
+ if (pr->flags.has_cst != 1) {
+ /* bus mastering control is necessary */
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 support requires BM control\n"));
+ return;
+ } else {
+ /* Here we enter C3 without bus mastering */
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 support without BM control\n"));
+ }
}
} else {
/*