Hello.
I found that commit c86176d51340d5ee ("staging: wfx: ensure HIF request has
been sent before polling") started using flush_workqueue(system_highpri_wq).
But please avoid flushing system-wide workqueues, for
flushing system-wide workqueues is dangerous and will be forbidden.
Link: https://lkml.kernel.org/r/49925af7-78a8-a3dd-bce6-cfc02e1a9236@xxxxxxxxxxxxxxxxxxx
