diff options
| author | Zhang Rui <rui.zhang@intel.com> | 2009-06-23 10:20:29 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-06-23 23:23:14 -0400 |
| commit | c02256be79a1a3557332ac51e653d574a2a7d2b5 (patch) | |
| tree | cad4af410464c14f0641148929b32bf3ab82ebd6 /ipc/msg.c | |
| parent | 07a2039b8eb0af4ff464efd3dfd95de5c02648c6 (diff) | |
ACPI: fix a deadlock in hotplug case
we used to run the hotplug code in keventd_wq.
But when hot removing the ACPI battery device,
power_supply_unregister invokes flush_scheduled_work.
This causes a deadlock. i.e
1. When dock is unplugged, all the hotplug code is run on kevent_wq.
2. the hotplug code removes all the child devices of dock device.
3. removing the child device may invoke flush_scheduled_work
4. flush_scheduled_work waits until all the work on kevent_wq to be
finished, while this will never be true because the hotplug code
is running on keventd_wq...
Introduce a new workqueue for hotplug in this patch.
http://bugzilla.kernel.org/show_bug.cgi?id=13533
Tested-by: Paul Martin <pm@debian.org>
Tested-by: Vojtech Gondzala <vojtech.gondzala@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'ipc/msg.c')
0 files changed, 0 insertions, 0 deletions