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: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --cc arch/powerpc/include/asm/eeh.h
Simple merge

diff --cc arch/powerpc/kernel/eeh.c
Simple merge

diff --cc arch/powerpc/kernel/eeh_sysfs.c
Simple merge

diff --cc arch/powerpc/platforms/powernv/eeh-powernv.c
Simple merge

diff --cc arch/powerpc/platforms/pseries/eeh_pseries.c
Simple merge