ACPI: introduce helper function acpi_has_method()

Introduce helper function acpi_has_method() and use it in a number
of places to simplify code.

[rjw: Changelog]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 082b4dd..a762716 100644 (file)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -548,12 +548,8 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery)
 
 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 {
-       acpi_status status = AE_OK;
-       acpi_handle handle = NULL;
-
        /* See if alarms are supported, and if so, set default */
-       status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
-       if (ACPI_FAILURE(status)) {
+       if (!acpi_has_method(battery->device->handle, "_BTP")) {
                clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
                return 0;
        }
@@ -1066,7 +1062,7 @@ static int acpi_battery_add(struct acpi_device *device)
 {
        int result = 0;
        struct acpi_battery *battery = NULL;
-       acpi_handle handle;
+
        if (!device)
                return -EINVAL;
        battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
@@ -1078,8 +1074,7 @@ static int acpi_battery_add(struct acpi_device *device)
        device->driver_data = battery;
        mutex_init(&battery->lock);
        mutex_init(&battery->sysfs_lock);
-       if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
-                       "_BIX", &handle)))
+       if (acpi_has_method(battery->device->handle, "_BIX"))
                set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
        result = acpi_battery_update(battery);
        if (result)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 80403c1..84bf06c 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1049,10 +1049,8 @@ int __init acpi_ec_ecdt_probe(void)
                * which needs it, has fake EC._INI method, so use it as flag.
                * Keep boot_ec struct as it will be needed soon.
                */
-               acpi_handle dummy;
                if (!dmi_name_in_vendors("ASUS") ||
-                   ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
-                                                       &dummy)))
+                   !acpi_has_method(boot_ec->handle, "_INI"))
                        return -ENODEV;
        }
 install:

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 1e9732d..51d7948 100644 (file)
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -164,17 +164,12 @@ static void acpi_processor_ppc_ost(acpi_handle handle, int status)
                {.type = ACPI_TYPE_INTEGER,},
        };
        struct acpi_object_list arg_list = {2, params};
-       acpi_handle temp;
 
-       params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
-       params[1].integer.value =  status;
-
-       /* when there is no _OST , skip it */
-       if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
-               return;
-
-       acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
-       return;
+       if (acpi_has_method(handle, "_OST")) {
+               params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
+               params[1].integer.value =  status;
+               acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+       }
 }
 
 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
@@ -468,14 +463,11 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 {
        int result = 0;
-       acpi_status status = AE_OK;
-       acpi_handle handle = NULL;
 
        if (!pr || !pr->performance || !pr->handle)
                return -EINVAL;
 
-       status = acpi_get_handle(pr->handle, "_PCT", &handle);
-       if (ACPI_FAILURE(status)) {
+       if (!acpi_has_method(pr->handle, "_PCT")) {
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "ACPI-based processor performance control unavailable\n"));
                return -ENODEV;
@@ -501,7 +493,7 @@ int acpi_processor_get_performance_info(struct acpi_processor *pr)
         */
  update_bios:
 #ifdef CONFIG_X86
-       if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
+       if (acpi_has_method(pr->handle, "_PPC")) {
                if(boot_cpu_has(X86_FEATURE_EST))
                        printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
                               "frequency support\n");

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 3322b47..b7201fc 100644 (file)
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -505,14 +505,12 @@ int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
                           void *preproc_data)
 {
        struct res_proc_context c;
-       acpi_handle not_used;
        acpi_status status;
 
        if (!adev || !adev->handle || !list_empty(list))
                return -EINVAL;
 
-       status = acpi_get_handle(adev->handle, METHOD_NAME__CRS, &not_used);
-       if (ACPI_FAILURE(status))
+       if (!acpi_has_method(adev->handle, METHOD_NAME__CRS))
                return 0;
 
        c.list = list;

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1098557..ada0b4c 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -193,7 +193,6 @@ static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
 static int acpi_scan_hot_remove(struct acpi_device *device)
 {
        acpi_handle handle = device->handle;
-       acpi_handle not_used;
        struct acpi_object_list arg_list;
        union acpi_object arg;
        struct device *errdev;
@@ -258,7 +257,7 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
        put_device(&device->dev);
        device = NULL;
 
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
+       if (acpi_has_method(handle, "_LCK")) {
                arg_list.count = 1;
                arg_list.pointer = &arg;
                arg.type = ACPI_TYPE_INTEGER;
@@ -652,7 +651,6 @@ static int acpi_device_setup_files(struct acpi_device *dev)
 {
        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
        acpi_status status;
-       acpi_handle temp;
        unsigned long long sun;
        int result = 0;
 
@@ -678,8 +676,7 @@ static int acpi_device_setup_files(struct acpi_device *dev)
        /*
         * If device has _STR, 'description' file is created
         */
-       status = acpi_get_handle(dev->handle, "_STR", &temp);
-       if (ACPI_SUCCESS(status)) {
+       if (acpi_has_method(dev->handle, "_STR")) {
                status = acpi_evaluate_object(dev->handle, "_STR",
                                        NULL, &buffer);
                if (ACPI_FAILURE(status))
@@ -709,8 +706,7 @@ static int acpi_device_setup_files(struct acpi_device *dev)
          * If device has _EJ0, 'eject' file is created that is used to trigger
          * hot-removal function from userland.
          */
-       status = acpi_get_handle(dev->handle, "_EJ0", &temp);
-       if (ACPI_SUCCESS(status)) {
+       if (acpi_has_method(dev->handle, "_EJ0")) {
                result = device_create_file(&dev->dev, &dev_attr_eject);
                if (result)
                        return result;
@@ -732,9 +728,6 @@ end:
 
 static void acpi_device_remove_files(struct acpi_device *dev)
 {
-       acpi_status status;
-       acpi_handle temp;
-
        if (dev->flags.power_manageable) {
                device_remove_file(&dev->dev, &dev_attr_power_state);
                if (dev->power.flags.power_resources)
@@ -745,20 +738,17 @@ static void acpi_device_remove_files(struct acpi_device *dev)
        /*
         * If device has _STR, remove 'description' file
         */
-       status = acpi_get_handle(dev->handle, "_STR", &temp);
-       if (ACPI_SUCCESS(status)) {
+       if (acpi_has_method(dev->handle, "_STR")) {
                kfree(dev->pnp.str_obj);
                device_remove_file(&dev->dev, &dev_attr_description);
        }
        /*
         * If device has _EJ0, remove 'eject' file.
         */
-       status = acpi_get_handle(dev->handle, "_EJ0", &temp);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(dev->handle, "_EJ0"))
                device_remove_file(&dev->dev, &dev_attr_eject);
 
-       status = acpi_get_handle(dev->handle, "_SUN", &temp);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(dev->handle, "_SUN"))
                device_remove_file(&dev->dev, &dev_attr_sun);
 
        if (dev->pnp.unique_id)
@@ -1334,13 +1324,10 @@ static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 
 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 {
-       acpi_handle temp;
-       acpi_status status = 0;
        int err;
 
        /* Presence of _PRW indicates wake capable */
-       status = acpi_get_handle(device->handle, "_PRW", &temp);
-       if (ACPI_FAILURE(status))
+       if (!acpi_has_method(device->handle, "_PRW"))
                return;
 
        err = acpi_bus_extract_wakeup_device_power_package(device->handle,
@@ -1370,7 +1357,6 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state)
        struct acpi_device_power_state *ps = &device->power.states[state];
        char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-       acpi_handle handle;
        acpi_status status;
 
        INIT_LIST_HEAD(&ps->resources);
@@ -1393,8 +1379,7 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 
        /* Evaluate "_PSx" to see if we can do explicit sets */
        pathname[2] = 'S';
-       status = acpi_get_handle(device->handle, pathname, &handle);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, pathname))
                ps->flags.explicit_set = 1;
 
        /*
@@ -1413,28 +1398,21 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 
 static void acpi_bus_get_power_flags(struct acpi_device *device)
 {
-       acpi_status status;
-       acpi_handle handle;
        u32 i;
 
        /* Presence of _PS0|_PR0 indicates 'power manageable' */
-       status = acpi_get_handle(device->handle, "_PS0", &handle);
-       if (ACPI_FAILURE(status)) {
-               status = acpi_get_handle(device->handle, "_PR0", &handle);
-               if (ACPI_FAILURE(status))
-                       return;
-       }
+       if (!acpi_has_method(device->handle, "_PS0") &&
+           !acpi_has_method(device->handle, "_PR0"))
+               return;
 
        device->flags.power_manageable = 1;
 
        /*
         * Power Management Flags
         */
-       status = acpi_get_handle(device->handle, "_PSC", &handle);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, "_PSC"))
                device->power.flags.explicit_get = 1;
-       status = acpi_get_handle(device->handle, "_IRC", &handle);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, "_IRC"))
                device->power.flags.inrush_current = 1;
 
        /*
@@ -1468,28 +1446,18 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
 
 static void acpi_bus_get_flags(struct acpi_device *device)
 {
-       acpi_status status = AE_OK;
-       acpi_handle temp = NULL;
-
        /* Presence of _STA indicates 'dynamic_status' */
-       status = acpi_get_handle(device->handle, "_STA", &temp);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, "_STA"))
                device->flags.dynamic_status = 1;
 
        /* Presence of _RMV indicates 'removable' */
-       status = acpi_get_handle(device->handle, "_RMV", &temp);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, "_RMV"))
                device->flags.removable = 1;
 
        /* Presence of _EJD|_EJ0 indicates 'ejectable' */
-       status = acpi_get_handle(device->handle, "_EJD", &temp);
-       if (ACPI_SUCCESS(status))
+       if (acpi_has_method(device->handle, "_EJD") ||
+           acpi_has_method(device->handle, "_EJ0"))
                device->flags.ejectable = 1;
-       else {
-               status = acpi_get_handle(device->handle, "_EJ0", &temp);
-               if (ACPI_SUCCESS(status))
-                       device->flags.ejectable = 1;
-       }
 }
 
 static void acpi_device_get_busid(struct acpi_device *device)
@@ -1538,27 +1506,24 @@ static void acpi_device_get_busid(struct acpi_device *device)
  */
 static int acpi_bay_match(acpi_handle handle)
 {
-       acpi_status status;
-       acpi_handle tmp;
        acpi_handle phandle;
 
-       status = acpi_get_handle(handle, "_EJ0", &tmp);
-       if (ACPI_FAILURE(status))
+       if (!acpi_has_method(handle, "_EJ0"))
                return -ENODEV;
 
-       if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
-               (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
-               (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
-               (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
+       if (acpi_has_method(handle, "_GTF") ||
+           acpi_has_method(handle, "_GTM") ||
+           acpi_has_method(handle, "_STM") ||
+           acpi_has_method(handle, "_SDD"))
                return 0;
 
        if (acpi_get_parent(handle, &phandle))
                return -ENODEV;
 
-        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
-                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
-                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
-                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
+       if (acpi_has_method(phandle, "_GTF") ||
+           acpi_has_method(phandle, "_GTM") ||
+           acpi_has_method(phandle, "_STM") ||
+           acpi_has_method(phandle, "_SDD"))
                 return 0;
 
        return -ENODEV;
@@ -1610,7 +1575,6 @@ static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
  */
 static int acpi_ibm_smbus_match(acpi_handle handle)
 {
-       acpi_handle h_dummy;
        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
        int result;
 
@@ -1629,9 +1593,9 @@ static int acpi_ibm_smbus_match(acpi_handle handle)
 
        /* Does it have the necessary (but misnamed) methods? */
        result = -ENODEV;
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
-           ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
-           ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
+       if (acpi_has_method(handle, "SBI") &&
+           acpi_has_method(handle, "SBR") &&
+           acpi_has_method(handle, "SBW"))
                result = 0;
 out:
        kfree(path.pointer);
@@ -1898,7 +1862,6 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
        struct acpi_device *device = NULL;
        int type;
        unsigned long long sta;
-       acpi_status status;
        int result;
 
        acpi_bus_get_device(handle, &device);
@@ -1919,10 +1882,8 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
        if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
            !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
                struct acpi_device_wakeup wakeup;
-               acpi_handle temp;
 
-               status = acpi_get_handle(handle, "_PRW", &temp);
-               if (ACPI_SUCCESS(status)) {
+               if (acpi_has_method(handle, "_PRW")) {
                        acpi_bus_extract_wakeup_device_power_package(handle,
                                                                     &wakeup);
                        acpi_power_resources_list_free(&wakeup.resources);

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 7443713..b08d973 100644 (file)
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -495,3 +495,18 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
        kfree(buffer.pointer);
 }
 EXPORT_SYMBOL(acpi_handle_printk);
+
+/**
+ * acpi_has_method: Check whether @handle has a method named @name
+ * @handle: ACPI device handle
+ * @name: name of object or method
+ *
+ * Check whether @handle has a method named @name.
+ */
+bool acpi_has_method(acpi_handle handle, char *name)
+{
+       acpi_handle tmp;
+
+       return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp));
+}
+EXPORT_SYMBOL(acpi_has_method);

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 5d7075d..a84533e 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -875,28 +875,21 @@ out:
 
 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 {
-       acpi_handle h_dummy1;
-
-       if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
+       if (acpi_has_method(device->dev->handle, "_ADR"))
                device->cap._ADR = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
+       if (acpi_has_method(device->dev->handle, "_BCL"))
                device->cap._BCL = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
+       if (acpi_has_method(device->dev->handle, "_BCM"))
                device->cap._BCM = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
+       if (acpi_has_method(device->dev->handle, "_BQC")) {
                device->cap._BQC = 1;
-       else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
-                               &h_dummy1))) {
+       } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
                printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
                device->cap._BCQ = 1;
        }
 
-       if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
+       if (acpi_has_method(device->dev->handle, "_DDC"))
                device->cap._DDC = 1;
-       }
 
        if (acpi_video_backlight_support()) {
                struct backlight_properties props;
@@ -984,26 +977,18 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 
 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 {
-       acpi_handle h_dummy1;
-
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_DOS"))
                video->cap._DOS = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_DOD"))
                video->cap._DOD = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_ROM"))
                video->cap._ROM = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_GPD"))
                video->cap._GPD = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_SPD"))
                video->cap._SPD = 1;
-       }
-       if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
+       if (acpi_has_method(video->device->handle, "_VPO"))
                video->cap._VPO = 1;
-       }
 }
 
 /*

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index e6bd910..ddefa5f 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -51,14 +51,13 @@ acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
                          void **retyurn_value)
 {
        long *cap = context;
-       acpi_handle h_dummy;
 
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) &&
-           ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) {
+       if (acpi_has_method(handle, "_BCM") &&
+           acpi_has_method(handle, "_BCL")) {
                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
                                  "support\n"));
                *cap |= ACPI_VIDEO_BACKLIGHT;
-               if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy)))
+               if (!acpi_has_method(handle, "_BQC"))
                        printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
                                "cannot determine initial brightness\n");
                /* We have backlight support, no need to scan further */
@@ -77,22 +76,20 @@ acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
  */
 long acpi_is_video_device(acpi_handle handle)
 {
-       acpi_handle h_dummy;
        long video_caps = 0;
 
        /* Is this device able to support video switching ? */
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "_DOD", &h_dummy)) ||
-           ACPI_SUCCESS(acpi_get_handle(handle, "_DOS", &h_dummy)))
+       if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
                video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
 
        /* Is this device able to retrieve a video ROM ? */
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "_ROM", &h_dummy)))
+       if (acpi_has_method(handle, "_ROM"))
                video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
 
        /* Is this device able to configure which video head to be POSTed ? */
-       if (ACPI_SUCCESS(acpi_get_handle(handle, "_VPO", &h_dummy)) &&
-           ACPI_SUCCESS(acpi_get_handle(handle, "_GPD", &h_dummy)) &&
-           ACPI_SUCCESS(acpi_get_handle(handle, "_SPD", &h_dummy)))
+       if (acpi_has_method(handle, "_VPO") &&
+           acpi_has_method(handle, "_GPD") &&
+           acpi_has_method(handle, "_SPD"))
                video_caps |= ACPI_VIDEO_DEVICE_POSTING;
 
        /* Only check for backlight functionality if one of the above hit. */

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 56e6b68..62b2811 100644 (file)
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -56,6 +56,9 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
 
 acpi_status
 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
+
+bool acpi_has_method(acpi_handle handle, char *name);
+
 #ifdef CONFIG_ACPI
 
 #include <linux/proc_fs.h>