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[Qemu-devel] [PULL 04/17] hw/virtio: Use object_initialize_child for cor
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [PULL 04/17] hw/virtio: Use object_initialize_child for correct reference counting |
Date: |
Fri, 24 May 2019 15:44:34 -0300 |
From: Philippe Mathieu-Daudé <address@hidden>
As explained in commit aff39be0ed97:
Both functions, object_initialize() and object_property_add_child()
increase the reference counter of the new object, so one of the
references has to be dropped afterwards to get the reference
counting right. Otherwise the child object will not be properly
cleaned up when the parent gets destroyed.
Thus let's use now object_initialize_child() instead to get the
reference counting here right.
This patch was generated using the following Coccinelle script:
@use_object_initialize_child@
expression parent_obj;
expression child_ptr;
expression child_name;
expression child_type;
expression child_size;
expression errp;
@@
(
- object_initialize(child_ptr, child_size, child_type);
+ object_initialize_child(parent_obj, child_name, child_ptr, child_size,
+ child_type, &error_abort, NULL);
... when != parent_obj
- object_property_add_child(parent_obj, child_name, OBJECT(child_ptr), NULL);
...
?- object_unref(OBJECT(child_ptr));
|
- object_initialize(child_ptr, child_size, child_type);
+ object_initialize_child(parent_obj, child_name, child_ptr, child_size,
+ child_type, errp, NULL);
... when != parent_obj
- object_property_add_child(parent_obj, child_name, OBJECT(child_ptr), errp);
...
?- object_unref(OBJECT(child_ptr));
)
While the object_initialize() function doesn't take an
'Error *errp' argument, the object_initialize_child() does.
Since this code is used when a machine is created (and is not
yet running), we deliberately choose to use the &error_abort
argument instead of ignoring errors if an object creation failed.
Suggested-by: Eduardo Habkost <address@hidden>
Inspired-by: Thomas Huth <address@hidden>
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>
---
hw/virtio/virtio.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 4805727b53..07f4a64b48 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2312,9 +2312,8 @@ void virtio_instance_init_common(Object *proxy_obj, void
*data,
{
DeviceState *vdev = data;
- object_initialize(vdev, vdev_size, vdev_name);
- object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL);
- object_unref(OBJECT(vdev));
+ object_initialize_child(proxy_obj, "virtio-backend", vdev, vdev_size,
+ vdev_name, &error_abort, NULL);
qdev_alias_all_properties(vdev, proxy_obj);
}
--
2.18.0.rc1.1.g3f1ff2140
- [Qemu-devel] [PULL 00/17] Machine Core queue, 2019-05-24, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 01/17] qom/object: Display more helpful message when an object type is missing, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 02/17] hw/ppc/pnv: Use object_initialize_child for correct reference counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 03/17] hw/misc/macio: Use object_initialize_child for correct ref. counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 04/17] hw/virtio: Use object_initialize_child for correct reference counting,
Eduardo Habkost <=
- [Qemu-devel] [PULL 05/17] hw/arm/bcm2835: Use TYPE_PL011 instead of hardcoded string, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 06/17] hw/arm/bcm2835: Use object_initialize() on PL011State, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 07/17] hw/arm/bcm2835: Use object_initialize_child for correct ref. counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 08/17] hw/arm/aspeed: Use object_initialize_child for correct ref. counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 09/17] hw/arm: Use object_initialize_child for correct reference counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 10/17] hw/mips: Use object_initialize() on MIPSCPSState, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 12/17] hw/microblaze/zynqmp: Move the IPI state into the PMUSoC state, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 11/17] hw/mips: Use object_initialize_child for correct reference counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 14/17] hw/microblaze/zynqmp: Use object_initialize_child for correct ref. counting, Eduardo Habkost, 2019/05/24
- [Qemu-devel] [PULL 13/17] hw/microblaze/zynqmp: Let the SoC manage the IPI devices, Eduardo Habkost, 2019/05/24