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If drmgr is used in the guest to hotplug a device before a device_add has been issued via the QEMU monitor, QEMU segfaults in configure_connector call. This occurs due to accessing of NULL FDT which otherwise would have been created and associated with the DRC during device_add command. Check for NULL FDT and return failure from configure_connector call. As per PAPR+, an error value of -9003 seems appropriate for this failure. Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Cc: Michael Roth <mdroth@linux.vnet.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>