[Bug 70839] [IVB] Undocking laptop causes warning in intel_dp_link_down+0x1d2/0x210

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70839

--- Comment #9 from Yuly Novikov <ynovikov at chromium.org> ---
I've been trying to find commits that might affect it by myself, looking at
drm-intel-next branch, and I believe with the current code, the warning will
still occur. The sequence of events leading to the warning is as follows:

ironlake_irq_handler()
  ilk_display_irq_handler()
    cpt_irq_handler()
      intel_hpd_irq_handler()
        i915_hotplug_work_func()
          intel_dp_hot_plug()
            intel_dp_check_link_status()
              intel_dp_get_link_status()
              intel_dp_link_down() 
          drm_helper_hpd_irq_event()
            drm_kms_helper_hotplug_event()
              drm_sysfs_hotplug_event()
                kobject_uevent_env()
<userspace uevent processing>
drm_mode_obj_set_property_ioctl()
  drm_mode_connector_set_obj_prop()
    intel_connector_dpms()
      intel_encoder_dpms()
        intel_crtc_update_dpms()
          ironlake_crtc_disable()
            intel_disable_dp()
              intel_dp_link_down()

There were several changes on these paths, but I fail to find there a change
that would prevent from intel_dp_link_down() to be called twice on SNB or IVB.

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