powerpc/eeh: Report frozen parent PE prior to child PE
When we have the corner case of frozen parent and child PE at the same time, we have to handle the frozen parent PE prior to the child. Without clearning the frozen state on parent PE, the child PE can't be recovered successfully. The patch searches the EEH PE hierarchy tree and returns the toppest frozen PE to be handled. It ensures the frozen parent PE will be handled prior to child PE. Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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