drm/i915: Synchronize hpd work in i915_hpd_storm_ctl_show()
While trying to add a chamelium test for short HPD IRQs, I ran into issues where a hotplug storm would be triggered, but the point at which it would be reported by the kernel would be after igt actually finished checking i915_hpd_storm_ctl's status. So, fix this by simply synchronizing our IRQ work, dig_port_work, and hotplug_work before printing out the HPD storm status in i915_hpd_storm_ctl_show(). Signed-off-by: Lyude Paul <lyude@redhat.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20181121003718.17704-1-lyude@redhat.com
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