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| author | Zhang Rui <rui.zhang@intel.com> | 2009-03-18 16:27:10 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-03-27 21:55:23 -0400 |
| commit | 24450c7add575cef53097738f16a4c1a720fa5cb (patch) | |
| tree | d144da0b0e0c79fdf3daad2e69f804c03b06ca96 /drivers/acpi/video.c | |
| parent | c8890f903a6fdf5711726e8e8d65cb13423f8833 (diff) | |
| download | linux-3.10-24450c7add575cef53097738f16a4c1a720fa5cb.tar.gz linux-3.10-24450c7add575cef53097738f16a4c1a720fa5cb.tar.bz2 linux-3.10-24450c7add575cef53097738f16a4c1a720fa5cb.zip | |
ACPI video: check the return value of acpi_video_device_lcd_set_level
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>
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 37 |
1 files changed, 21 insertions, 16 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index f0e6eb53416..52f52b32b63 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -322,12 +322,12 @@ static int acpi_video_get_brightness(struct backlight_device *bd) static int acpi_video_set_brightness(struct backlight_device *bd) { - int request_level = bd->props.brightness+2; + 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, - vd->brightness->levels[request_level]); - return 0; + + return acpi_video_device_lcd_set_level(vd, + vd->brightness->levels[request_level]); } 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); + 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) |