mirror of
https://github.com/qemu/qemu.git
synced 2024-11-30 07:13:38 +08:00
8b5e6caf01
When [2] was fixed it was agreed that adding and calling post_plug() callback after device_reset() was low risk approach to hotfix issue right before release. So it was merged instead of moving already existing plug() callback after device_reset() is called which would be more risky and require all plug() callbacks audit. Looking at the current plug() callbacks, it doesn't seem that moving plug() callback after device_reset() is breaking anything, so here goes agreed upon [3] proper fix which essentially reverts [1][2] and moves plug() callback after device_reset(). This way devices always comes to plug() stage, after it's been fully initialized (including being reset), which fixes race condition [2] without need for an extra post_plug() callback. 1. (25e897881"qdev: add HotplugHandler->post_plug() callback") 2. (8449bcf94"virtio-scsi: fix hotplug ->reset() vs event race") 3. https://www.mail-archive.com/qemu-devel@nongnu.org/msg549915.html Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <1539696820-273275-1-git-send-email-imammedo@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Tested-by: Pierre Morel<pmorel@linux.ibm.com> Acked-by: Pierre Morel<pmorel@linux.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
|
|
* Hotplug handler interface.
|
|
*
|
|
* Copyright (c) 2014 Red Hat Inc.
|
|
*
|
|
* Authors:
|
|
* Igor Mammedov <imammedo@redhat.com>,
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
#include "qemu/osdep.h"
|
|
#include "hw/hotplug.h"
|
|
#include "qemu/module.h"
|
|
|
|
void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
|
|
DeviceState *plugged_dev,
|
|
Error **errp)
|
|
{
|
|
HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
|
|
|
|
if (hdc->pre_plug) {
|
|
hdc->pre_plug(plug_handler, plugged_dev, errp);
|
|
}
|
|
}
|
|
|
|
void hotplug_handler_plug(HotplugHandler *plug_handler,
|
|
DeviceState *plugged_dev,
|
|
Error **errp)
|
|
{
|
|
HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
|
|
|
|
if (hdc->plug) {
|
|
hdc->plug(plug_handler, plugged_dev, errp);
|
|
}
|
|
}
|
|
|
|
void hotplug_handler_unplug_request(HotplugHandler *plug_handler,
|
|
DeviceState *plugged_dev,
|
|
Error **errp)
|
|
{
|
|
HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
|
|
|
|
if (hdc->unplug_request) {
|
|
hdc->unplug_request(plug_handler, plugged_dev, errp);
|
|
}
|
|
}
|
|
|
|
void hotplug_handler_unplug(HotplugHandler *plug_handler,
|
|
DeviceState *plugged_dev,
|
|
Error **errp)
|
|
{
|
|
HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
|
|
|
|
if (hdc->unplug) {
|
|
hdc->unplug(plug_handler, plugged_dev, errp);
|
|
}
|
|
}
|
|
|
|
static const TypeInfo hotplug_handler_info = {
|
|
.name = TYPE_HOTPLUG_HANDLER,
|
|
.parent = TYPE_INTERFACE,
|
|
.class_size = sizeof(HotplugHandlerClass),
|
|
};
|
|
|
|
static void hotplug_handler_register_types(void)
|
|
{
|
|
type_register_static(&hotplug_handler_info);
|
|
}
|
|
|
|
type_init(hotplug_handler_register_types)
|