1 files changed, 43 insertions, 8 deletions

diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index b1df4eee865..32aeceae10e 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -35,6 +35,7 @@
 #include <linux/jiffies.h>
 #include <linux/delay.h>
 #include <linux/power_supply.h>
+#include <linux/dmi.h>
 
 #include "sbshc.h"
 #include "battery.h"
@@ -61,6 +62,8 @@ static unsigned int cache_time = 1000;
 module_param(cache_time, uint, 0644);
 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
 
+static bool sbs_manager_broken;
+
 #define MAX_SBS_BAT			4
 #define ACPI_SBS_BLOCK_MAX		32
 
@@ -494,16 +497,21 @@ static int acpi_battery_read(struct acpi_battery *battery)
 				  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 	} else if (battery->id == 0)
 		battery->present = 1;
+
 	if (result || !battery->present)
 		return result;
 
 	if (saved_present != battery->present) {
 		battery->update_time = 0;
 		result = acpi_battery_get_info(battery);
-		if (result)
+		if (result) {
+			battery->present = 0;
 			return result;
+		}
 	}
 	result = acpi_battery_get_state(battery);
+	if (result)
+		battery->present = 0;
 	return result;
 }
 
@@ -535,6 +543,7 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 	result = power_supply_register(&sbs->device->dev, &battery->bat);
 	if (result)
 		goto end;
+
 	result = device_create_file(battery->bat.dev, &alarm_attr);
 	if (result)
 		goto end;
@@ -613,12 +622,31 @@ static void acpi_sbs_callback(void *context)
 	}
 }
 
+static int disable_sbs_manager(const struct dmi_system_id *d)
+{
+	sbs_manager_broken = true;
+	return 0;
+}
+
+static struct dmi_system_id acpi_sbs_dmi_table[] = {
+	{
+		.callback = disable_sbs_manager,
+		.ident = "Apple",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
+		},
+	},
+	{ },
+};
+
 static int acpi_sbs_add(struct acpi_device *device)
 {
 	struct acpi_sbs *sbs;
 	int result = 0;
 	int id;
 
+	dmi_check_system(acpi_sbs_dmi_table);
+
 	sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 	if (!sbs) {
 		result = -ENOMEM;
@@ -637,14 +665,21 @@ static int acpi_sbs_add(struct acpi_device *device)
 	if (result && result != -ENODEV)
 		goto end;
 
-	result = acpi_manager_get_info(sbs);
-	if (!result) {
-		sbs->manager_present = 1;
-		for (id = 0; id < MAX_SBS_BAT; ++id)
-			if ((sbs->batteries_supported & (1 << id)))
-				acpi_battery_add(sbs, id);
-	} else
+	result = 0;
+
+	if (!sbs_manager_broken) {
+		result = acpi_manager_get_info(sbs);
+		if (!result) {
+			sbs->manager_present = 0;
+			for (id = 0; id < MAX_SBS_BAT; ++id)
+				if ((sbs->batteries_supported & (1 << id)))
+					acpi_battery_add(sbs, id);
+		}
+	}
+
+	if (!sbs->manager_present)
 		acpi_battery_add(sbs, 0);
+
 	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
       end:
 	if (result)