[Skiboot] [PATCH 1/2] hw/phb3: Fix potential race in EOI

[Vaibhav Jain]

Tested with genwqe framework to simulate heavy interrupt traffic and cxl
driver patches at:

https://github.com/ibm-genwqe/genwqe-user
http://patchwork.ozlabs.org/patch/613380/
http://patchwork.ozlabs.org/patch/613381/


Michael Neuling <mikey at neuling.org> writes:
> Signed-off-by: Michael Neuling <mikey at neuling.org>
Tested-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>