ACPI / Thermal / video: fix max_level incorrect value

commit 059500940def (ACPI/video: export acpi_video_get_levels)
mistakenly dropped the correct value of max_level and that caused the
set_level function following failed and the acpi_video backlight interface
didn't get created. Fix this by passing back the correct max_level value.

While at it, also fix the param used in acpi_video_device_lcd_query_levels
where acpi_handle is expected but acpi_video_device is passed.

Fixes: 059500940def (ACPI/video: export acpi_video_get_levels)
Reported-and-tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 3d5b8a099351..c1d138e128cb 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -754,7 +754,8 @@ static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 }
 
 int acpi_video_get_levels(struct acpi_device *device,
-                          struct acpi_video_device_brightness **dev_br)
+                          struct acpi_video_device_brightness **dev_br,
+                          int *pmax_level)
 {
         union acpi_object *obj = NULL;
         int i, max_level = 0, count = 0, level_ac_battery = 0;
@@ -841,6 +842,8 @@ int acpi_video_get_levels(struct acpi_device *device,
 
         br->count = count;
         *dev_br = br;
+        if (pmax_level)
+                *pmax_level = max_level;
 
 out:
         kfree(obj);
@@ -869,7 +872,7 @@ acpi_video_init_brightness(struct acpi_video_device *device)
         struct acpi_video_device_brightness *br = NULL;
         int result = -EINVAL;
 
-        result = acpi_video_get_levels(device->dev, &br);
+        result = acpi_video_get_levels(device->dev, &br, &max_level);
         if (result)
                 return result;
         device->brightness = br;
@@ -1737,7 +1740,7 @@ static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
 
         mutex_lock(&video->device_list_lock);
         list_for_each_entry(dev, &video->video_device_list, entry) {
-                if (!acpi_video_device_lcd_query_levels(dev, &levels))
+                if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
                         kfree(levels);
         }
         mutex_unlock(&video->device_list_lock);