powerpc/powernv/eeh: Skip finding bus for VF resets

When the PE used in pnv_eeh_reset() is that of a VF,
pnv_eeh_reset_vf_pe() is used.  Unlike the other reset functions called
in pnv_eeh_reset(), the VF reset doesn't require a bus, and if a bus was
missing the function would error out before resetting the VF PE.

To avoid this, reorder the VF reset function to occur before finding and
checking the bus.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powernv/eeh-powernv.c

@@ -1090,14 +1090,15 @@ static int pnv_eeh_reset(struct eeh_pe *pe, int option)
 		}
 	}
 
+	if (pe->type & EEH_PE_VF)
+		return pnv_eeh_reset_vf_pe(pe, option);
+
 	bus = eeh_pe_bus_get(pe);
 	if (!bus) {
 		pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n",
 			__func__, pe->phb->global_number, pe->addr);
 		return -EIO;
 	}
-	if (pe->type & EEH_PE_VF)
-		return pnv_eeh_reset_vf_pe(pe, option);
 
 	if (pci_is_root_bus(bus) ||
 	    pci_is_root_bus(bus->parent))