powerpc/eeh: Introdce flag to protect sysfs
The patch introduces flag EEH_DEV_SYSFS to keep track that the sysfs entries for the corresponding EEH device (then PCI device) has been added or removed, in order to avoid race condition. Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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