[Qemu-devel] [PULL 27/29] Revert "qdev: Free QemuOpts when the QOM path goes away"

[Paolo Bonzini <pbonzini@redhat.com>]

From: Michael Roth <mdroth@linux.vnet.ibm.com>

This reverts commit abed886ec60cf239a03515cf0b30fb11fa964c44.

This patch originally addressed an issue where a DEVICE_DELETED
event could be emitted (in device_unparent()) before a Device's
QemuOpts were cleaned up (in device_finalize()), leading to a
"duplicate ID" error if management attempted to immediately add
a device with the same ID in response to the DEVICE_DELETED event.

An alternative will be implemented in a subsequent patch where we
defer the DEVICE_DELETED event until device_finalize(), which would
also prevent the race, so we revert the original fix in preparation.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20171016222315.407-3-mdroth@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/core/qdev.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 0019a49..418cdac 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -1069,6 +1069,7 @@ static void device_finalize(Object *obj)
     NamedGPIOList *ngl, *next;
 
     DeviceState *dev = DEVICE(obj);
+    qemu_opts_del(dev->opts);
 
     QLIST_FOREACH_SAFE(ngl, &dev->gpios, node, next) {
         QLIST_REMOVE(ngl, node);
@@ -1118,9 +1119,6 @@ static void device_unparent(Object *obj)
         g_free(dev->canonical_path);
         dev->canonical_path = NULL;
     }
-
-    qemu_opts_del(dev->opts);
-    dev->opts = NULL;
 }
 
 static void device_class_init(ObjectClass *class, void *data)
-- 
1.8.3.1