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ACPI video: check the return value of acpi_video_device_lcd_set_level

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Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2009-03-18 16:27:10 +08:00 committed by Len Brown
parent c8890f903a
commit 24450c7add
1 changed files with 21 additions and 16 deletions
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29
drivers/acpi/video.c
View file

@ -325,9 +325,9 @@ static int acpi_video_set_brightness(struct backlight_device *bd)
int request_level = bd->props.brightness + 2;
struct acpi_video_device *vd =
(struct acpi_video_device *)bl_get_data(bd);
acpi_video_device_lcd_set_level(vd,
return acpi_video_device_lcd_set_level(vd,
vd->brightness->levels[request_level]);
return 0;
}
static struct backlight_ops acpi_backlight_ops = {
@ -482,23 +482,29 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
static int
acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
{
int status = AE_OK;
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
int state;
arg0.integer.value = level;
if (device->cap._BCM)
status = acpi_evaluate_object(device->dev->handle, "_BCM",
&args, NULL);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
return -EIO;
}
device->brightness->curr = level;
for (state = 2; state < device->brightness->count; state++)
if (level == device->brightness->levels[state])
if (level == device->brightness->levels[state]) {
device->backlight->props.brightness = state - 2;
return 0;
}
return status;
ACPI_ERROR((AE_INFO, "Current brightness invalid"));
return -EINVAL;
}
static int
@ -1082,13 +1088,12 @@ acpi_video_device_write_brightness(struct file *file,
/* validate through the list of available levels */
for (i = 2; i < dev->brightness->count; i++)
if (level == dev->brightness->levels[i]) {
if (ACPI_SUCCESS
(acpi_video_device_lcd_set_level(dev, level)))
dev->brightness->curr = level;
if (!acpi_video_device_lcd_set_level(dev, level))
return count;
break;
}
return count;
return -EINVAL;
}
static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
@ -1786,7 +1791,7 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
level_next = acpi_video_get_next_level(device, level_current, event);
acpi_video_device_lcd_set_level(device, level_next);
result = acpi_video_device_lcd_set_level(device, level_next);
out:
if (result)