ACPI: SBS: Ignore alarms coming from unknown devices

http://bugzilla.kernel.org/show_bug.cgi?id=9362

Signed-off-by: Alexey Starikovskiy <[e-mail]>
Signed-off-by: Len Brown <[e-mail]>

drivers/acpi/sbs.c

···
 #define ACPI_BATTERY_DIR_NAME		"BAT%i"
 #define ACPI_AC_DIR_NAME		"AC0"
 
-enum acpi_sbs_device_addr {
-	ACPI_SBS_CHARGER = 0x9,
-	ACPI_SBS_MANAGER = 0xa,
-	ACPI_SBS_BATTERY = 0xb,
-};
-
 #define ACPI_SBS_NOTIFY_STATUS		0x80
 #define ACPI_SBS_NOTIFY_INFO		0x81
 

drivers/acpi/sbshc.c

···
 
 EXPORT_SYMBOL_GPL(acpi_smbus_unregister_callback);
 
-static void acpi_smbus_callback(void *context)
+static inline void acpi_smbus_callback(void *context)
 {
 	struct acpi_smb_hc *hc = context;
-
 	if (hc->callback)
 		hc->callback(hc->context);
 }
···
 {
 	struct acpi_smb_hc *hc = context;
 	union acpi_smb_status status;
+	u8 address;
 	if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
 		return 0;
 	/* Check if it is only a completion notify */
···
 	if (!status.fields.alarm)
 		return 0;
 	mutex_lock(&hc->lock);
+	smb_hc_read(hc, ACPI_SMB_ALARM_ADDRESS, &address);
 	status.fields.alarm = 0;
 	smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
-	if (hc->callback)
-		acpi_os_execute(OSL_GPE_HANDLER, acpi_smbus_callback, hc);
+	/* We are only interested in events coming from known devices */
+	switch (address >> 1) {
+		case ACPI_SBS_CHARGER:
+		case ACPI_SBS_MANAGER:
+		case ACPI_SBS_BATTERY:
+			acpi_os_execute(OSL_GPE_HANDLER,
+					acpi_smbus_callback, hc);
+		default:;
+	}
 	mutex_unlock(&hc->lock);
 	return 0;
 }

drivers/acpi/sbshc.h

···
 
 static const u8 SMBUS_PEC = 0x80;
 
+enum acpi_sbs_device_addr {
+	ACPI_SBS_CHARGER = 0x9,
+	ACPI_SBS_MANAGER = 0xa,
+	ACPI_SBS_BATTERY = 0xb,
+};
+
 typedef void (*smbus_alarm_callback)(void *context);
 
 extern int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,