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hw/ppc/spapr_drc.c: change spapr_drc_needed to use drc->dev
This patch makes a small fix in 'spapr_drc_needed' to change how we detect if a DRC has a device attached. Previously it used dr_entity_sense for this, which works for physical DRCs. However, for logical DRCs, it didn't cover the case where a logical DRC has a drc->dev but the state is LOGICAL_UNUSABLE (e.g. a hotplugged CPU before CAS). In this case, the dr_entity_sense of this DRC returns UNUSABLE and the code was considering that there were no dev attached, making spapr_drc_needed return 'false' when in fact we would like to migrate the DRC. Changing it to check for drc->dev instead works for all DRC types. Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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