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It is not advisable to execute an object_dynamic_cast() to poke into bus->qbus.parent and follow it up with a C cast into the PnvPHB type we think we got. In fact this is not needed. There is nothing sophisticated being done with the PHB object retrieved during root_port_realize() for both PHB3 and PHB4. We're retrieving a PHB reference just to access phb->chip_id and phb->phb_id and use them to define the chassis/slot of the root port. phb->phb_id is already being passed to pnv_phb_attach_root_port() via the 'index' parameter. Let's also add a 'chip_id' parameter to this function and assign chassis and slot right there. This will spare us from the hassle of accessing the PHB object inside realize(). Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com> Message-Id: <20220621173436.165912-4-danielhb413@gmail.com>