Re: edac_core: crashes on shutdown

[Florian Mickler <florian@mickler.org>]

On Thu, 2 Dec 2010 19:51:23 +0100
Borislav Petkov <bp@amd64.org> wrote:

> On Thu, Dec 02, 2010 at 01:14:12PM -0500, Florian Mickler wrote:
> > Yes. That should work. Once we stopped the workqueue and removed it
> > from the global list, do we actually need to set it to OP_OFFLINE?
> 
> I think yes, because we seem to protect ourselves in the actual
> edac_mc_workq_function() on exit, if we overlap the work items
> cancellation with the execution of the delayed work at the same time on
> a different cpu. Besides, it is a single assignment and it does cost us
> almost nothing.

true. I wonder if the flush workqueue waits for the work-function
to finish? 

> 
> > Also 00740c585 did fix a hang in edac_mc.c... could this also happen
> > in the edac_device_del_device/edac_pci_del_device functions?
> 
> Nope, because there we don't check ->op_state when we cancel the work
> items in the respective _teardown() functions - we simply cancel them
> unconditionally.
> 

But shouldn't we check ->op_state for those as well? Why don't we hang
for those functions in similar cases as your original patch fixed?