On Tue, Oct 23, 2012 at 6:10 AM, Tang Chen [off-list ref] wrote:

As the comments in __acpi_os_execute() said:

        We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
        because the hotplug code may call driver .remove() functions,
        which invoke flush_scheduled_work/acpi_os_wait_events_complete
        to flush these workqueues.

we should keep the hotplug code in kacpi_hotplug_wq.

But we have the following call series in kernel now:
        acpi_ev_queue_notify_request()
        |--> acpi_os_execute()
             |--> __acpi_os_execute(type, function, context, 0)

The last parameter 0 makes the container_notify_cb() executed in
kacpi_notify_wq or kacpid_wq. So, we need to put the real hotplug code
into kacpi_hotplug_wq.

I had other patches that merge acpi_hp_work in acpiphp and pci_root_hp.

I just put them in to for-pci-split-pci-root-hp-2.

can you check them to see if you can use it?

Thanks

Yinghai