On Fri, Oct 11, 2013 at 11:31:53AM -0700, Jesse Barnes wrote:
[snip]
> static int intel_panel_get_brightness(struct backlight_device *bd)
> {
> - struct drm_device *dev = bl_get_data(bd);
> - return intel_panel_get_backlight(dev);
> + struct intel_connector *connector = bl_get_data(bd);
> + struct drm_device *dev = connector->base.dev;
> + enum pipe pipe;
> + int ret = 0;
> +
> + mutex_lock(&dev->mode_config.mutex);
> + pipe = intel_get_pipe_from_connector(connector);
> + mutex_unlock(&dev->mode_config.mutex);
> + if (pipe == INVALID_PIPE) {
> + ret = 0;
> + goto out_unlock;
> + }
> +
> + ret = intel_panel_get_backlight(connector->base.dev, pipe);
> +out_unlock:
> + mutex_unlock(&dev->mode_config.mutex);
I see mutex_unlock(&dev->mode_config.mutex) twice here. I think you've
just volunteered yourselve for some testcases ;-)
Ideas:
- Make sure all lvds/edp connectors are enabled and bash on all backlight
interfaces (with igt_fork it's easy to do that concurrently).
- Race the above with output changes: dpms on/off and changing the crtc
around.
- Race the above with system suspend for bonus points (can be completely
stitched together from igt helpers).
Cheers, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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