Merge tag 'pm-for-3.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "This removes ACPICA code that had already been removed once from the
  kernel already by commit 2780cc4660e1 ("[ACPI] Fix suspend/resume
  lockup issue by leaving Bus Master Arbitration enabled"), because it
  was known to cause systems to lock up during resume from suspend, but
  was re-introduced by mistake during the v3.4 merge window."

* tag 'pm-for-3.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Leave Bus Master Arbitration enabled for suspend/resume

1 files changed, 0 insertions, 22 deletions

diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index 0ed85cac3231..615996a36bed 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -95,18 +95,6 @@ acpi_status acpi_hw_legacy_sleep(u8 sleep_state, u8 flags)
                 return_ACPI_STATUS(status);
         }
 
-        if (sleep_state != ACPI_STATE_S5) {
-                /*
-                 * Disable BM arbitration. This feature is contained within an
-                 * optional register (PM2 Control), so ignore a BAD_ADDRESS
-                 * exception.
-                 */
-                status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
-                if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {
-                        return_ACPI_STATUS(status);
-                }
-        }
-
         /*
          * 1) Disable/Clear all GPEs
          * 2) Enable all wakeup GPEs
@@ -364,16 +352,6 @@ acpi_status acpi_hw_legacy_wake(u8 sleep_state, u8 flags)
                                     [ACPI_EVENT_POWER_BUTTON].
                                     status_register_id, ACPI_CLEAR_STATUS);
 
-        /*
-         * Enable BM arbitration. This feature is contained within an
-         * optional register (PM2 Control), so ignore a BAD_ADDRESS
-         * exception.
-         */
-        status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
-        if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {
-                return_ACPI_STATUS(status);
-        }
-
         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
         return_ACPI_STATUS(status);
 }