Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  ACPI / Sleep: Allow the NVS saving to be skipped during suspend to RAM
  ACPI: create "processor.bm_check_disable" boot param
  ACPI: skip checking BM_STS if the BIOS doesn't ask for it
  ACPI: fix unused function warning
  ACPI: processor: fix processor_physically_present on UP
  ACPI video: fix string mismatch for Sony SR290 laptop
  ACPI battery: don't invoke power_supply_changed twice when battery is hot-added
  ACPI: handle systems which asynchoronously enable ACPI mode

6 files changed, 46 insertions, 30 deletions

diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index d97b8dce1668..18b3f1468b7d 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -70,6 +70,7 @@ acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 acpi_status acpi_enable(void)
 {
         acpi_status status;
+        int retry;
 
         ACPI_FUNCTION_TRACE(acpi_enable);
 
@@ -98,16 +99,18 @@ acpi_status acpi_enable(void)
 
         /* Sanity check that transition succeeded */
 
-        if (acpi_hw_get_mode() != ACPI_SYS_MODE_ACPI) {
-                ACPI_ERROR((AE_INFO,
-                            "Hardware did not enter ACPI mode"));
-                return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+        for (retry = 0; retry < 30000; ++retry) {
+                if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
+                        if (retry != 0)
+                                ACPI_WARNING((AE_INFO,
+                                "Platform took > %d00 usec to enter ACPI mode", retry));
+                        return_ACPI_STATUS(AE_OK);
+                }
+                acpi_os_stall(100);     /* 100 usec */
         }
 
-        ACPI_DEBUG_PRINT((ACPI_DB_INIT,
-                          "Transition to ACPI mode successful\n"));
-
-        return_ACPI_STATUS(AE_OK);
+        ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode"));
+        return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 }
 
 ACPI_EXPORT_SYMBOL(acpi_enable)
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 3026e3fa83ef..dc58402b0a17 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -868,9 +868,15 @@ static void acpi_battery_remove_fs(struct acpi_device *device)
 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 {
         struct acpi_battery *battery = acpi_driver_data(device);
+#ifdef CONFIG_ACPI_SYSFS_POWER
+        struct device *old;
+#endif
 
         if (!battery)
                 return;
+#ifdef CONFIG_ACPI_SYSFS_POWER
+        old = battery->bat.dev;
+#endif
         acpi_battery_update(battery);
         acpi_bus_generate_proc_event(device, event,
                                      acpi_battery_present(battery));
@@ -879,7 +885,7 @@ static void acpi_battery_notify(struct acpi_device *device, u32 event)
                                         acpi_battery_present(battery));
 #ifdef CONFIG_ACPI_SYSFS_POWER
         /* acpi_battery_update could remove power_supply object */
-        if (battery->bat.dev)
+        if (old && battery->bat.dev)
                 power_supply_changed(&battery->bat);
 #endif
 }
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index 01381be05e96..2bb28b9d91c4 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -214,7 +214,7 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
         .ident = "Sony VGN-SR290J",
         .matches = {
                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
-                     DMI_MATCH(DMI_PRODUCT_NAME, "Sony VGN-SR290J"),
+                     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
                 },
         },
         {
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 51284351418f..e9699aaed109 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -223,7 +223,7 @@ static bool processor_physically_present(acpi_handle handle)
         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
         cpuid = acpi_get_cpuid(handle, type, acpi_id);
 
-        if (cpuid == -1)
+        if ((cpuid == -1) && (num_possible_cpus() > 1))
                 return false;
 
         return true;
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index b1b385692f46..e9a8026d39f0 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -76,14 +76,19 @@ static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
 module_param(max_cstate, uint, 0000);
 static unsigned int nocst __read_mostly;
 module_param(nocst, uint, 0000);
+static int bm_check_disable __read_mostly;
+module_param(bm_check_disable, uint, 0000);
 
 static unsigned int latency_factor __read_mostly = 2;
 module_param(latency_factor, uint, 0644);
 
+#ifdef CONFIG_ACPI_PROCFS
 static u64 us_to_pm_timer_ticks(s64 t)
 {
         return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
 }
+#endif
+
 /*
  * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
  * For now disable this. Probably a bug somewhere else.
@@ -763,6 +768,9 @@ static int acpi_idle_bm_check(void)
 {
         u32 bm_status = 0;
 
+        if (bm_check_disable)
+                return 0;
+
         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
         if (bm_status)
                 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
@@ -947,7 +955,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
         if (acpi_idle_suspend)
                 return(acpi_idle_enter_c1(dev, state));
 
-        if (acpi_idle_bm_check()) {
+        if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
                 if (dev->safe_state) {
                         dev->last_state = dev->safe_state;
                         return dev->safe_state->enter(dev, dev->safe_state);
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 5b7c52e4a00f..2862c781b372 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -82,6 +82,20 @@ static int acpi_sleep_prepare(u32 acpi_state)
 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
 
 /*
+ * The ACPI specification wants us to save NVS memory regions during hibernation
+ * and to restore them during the subsequent resume.  Windows does that also for
+ * suspend to RAM.  However, it is known that this mechanism does not work on
+ * all machines, so we allow the user to disable it with the help of the
+ * 'acpi_sleep=nonvs' kernel command line option.
+ */
+static bool nvs_nosave;
+
+void __init acpi_nvs_nosave(void)
+{
+        nvs_nosave = true;
+}
+
+/*
  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
  * user to request that behavior by using the 'acpi_old_suspend_ordering'
  * kernel command line option that causes the following variable to be set.
@@ -197,8 +211,7 @@ static int acpi_suspend_begin(suspend_state_t pm_state)
         u32 acpi_state = acpi_suspend_states[pm_state];
         int error = 0;
 
-        error = suspend_nvs_alloc();
-
+        error = nvs_nosave ? 0 : suspend_nvs_alloc();
         if (error)
                 return error;
 
@@ -388,20 +401,6 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 #endif /* CONFIG_SUSPEND */
 
 #ifdef CONFIG_HIBERNATION
-/*
- * The ACPI specification wants us to save NVS memory regions during hibernation
- * and to restore them during the subsequent resume.  However, it is not certain
- * if this mechanism is going to work on all machines, so we allow the user to
- * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
- * option.
- */
-static bool s4_no_nvs;
-
-void __init acpi_s4_no_nvs(void)
-{
-        s4_no_nvs = true;
-}
-
 static unsigned long s4_hardware_signature;
 static struct acpi_table_facs *facs;
 static bool nosigcheck;
@@ -415,7 +414,7 @@ static int acpi_hibernation_begin(void)
 {
         int error;
 
-        error = s4_no_nvs ? 0 : suspend_nvs_alloc();
+        error = nvs_nosave ? 0 : suspend_nvs_alloc();
         if (!error) {
                 acpi_target_sleep_state = ACPI_STATE_S4;
                 acpi_sleep_tts_switch(acpi_target_sleep_state);
@@ -510,7 +509,7 @@ static int acpi_hibernation_begin_old(void)
         error = acpi_sleep_prepare(ACPI_STATE_S4);
 
         if (!error) {
-                if (!s4_no_nvs)
+                if (!nvs_nosave)
                         error = suspend_nvs_alloc();
                 if (!error)
                         acpi_target_sleep_state = ACPI_STATE_S4;