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spapr: Use spapr_drc_reset_all() at machine reset 

Documentation of object_child_foreach_recursive() clearly stipulates
that "it is forbidden to add or remove children from @obj from the @fn
callback". But this is exactly what we do during machine reset. The call
to spapr_drc_reset() can finalize the hot-unplug sequence of a PHB or a
PCI bridge, both of which will then in turn destroy their PCI DRCs. This
could potentially invalidate the iterator used by do_object_child_foreach().
It is pure luck that this haven't caused any issues so far.

Use spapr_drc_reset_all() since it can cope with DRC removal.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20201218103400.689660-5-groug@kaod.org>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Tested-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2020-12-18 11:33:58 +01:00 committed by David Gibson
parent babb819f94
commit 1105504100
1 changed files with 1 additions and 14 deletions
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15
hw/ppc/spapr.c
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@ -1566,19 +1566,6 @@ void spapr_setup_hpt(SpaprMachineState *spapr)
}
}
static int spapr_reset_drcs(Object *child, void *opaque)
{
SpaprDrc *drc =
(SpaprDrc *) object_dynamic_cast(child,
TYPE_SPAPR_DR_CONNECTOR);
if (drc) {
spapr_drc_reset(drc);
}
return 0;
}
static void spapr_machine_reset(MachineState *machine)
{
SpaprMachineState *spapr = SPAPR_MACHINE(machine);
@ -1633,7 +1620,7 @@ static void spapr_machine_reset(MachineState *machine)
* will crash QEMU if the DIMM holding the vring goes away). To avoid such
* situations, we reset DRCs after all devices have been reset.
*/
object_child_foreach_recursive(object_get_root(), spapr_reset_drcs, NULL);
spapr_drc_reset_all(spapr);
spapr_clear_pending_events(spapr);