[PATCH] spapr: Assert DIMM unplug state in spapr_memory_unplug()

[Greg Kurz]

spapr_memory_unplug() is the last step of the hot unplug sequence.
It is indirectly called by:

 spapr_lmb_release()
  hotplug_handler_unplug()

and spapr_lmb_release() already buys us that DIMM unplug state is
present : it gets restored with spapr_recover_pending_dimm_state()
if missing.

g_assert() that spapr_pending_dimm_unplugs_find() cannot return NULL
in spapr_memory_unplug() to make this clear and silence Coverity.

Fixes: Coverity CID 1450767
Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/ppc/spapr.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index d56418ca2942..73a06df3b1b1 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3660,6 +3660,9 @@ static void spapr_memory_unplug(HotplugHandler 
*hotplug_dev, DeviceState *dev)
     SpaprMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
     SpaprDimmState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
 
+    /* We really shouldn't get this far without anything to unplug */
+    g_assert(ds);
+
     pc_dimm_unplug(PC_DIMM(dev), MACHINE(hotplug_dev));
     qdev_unrealize(dev);
     spapr_pending_dimm_unplugs_remove(spapr, ds);