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Re: [PATCH 4/6] spapr: Use spapr_drc_reset_all() at machine reset


From: Daniel Henrique Barboza
Subject: Re: [PATCH 4/6] spapr: Use spapr_drc_reset_all() at machine reset
Date: Mon, 21 Dec 2020 17:36:57 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0



On 12/18/20 7:33 AM, Greg Kurz wrote:
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>
---

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

  hw/ppc/spapr.c | 15 +--------------
  1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 43dded87f498..8528bc90fec4 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -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);



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