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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
/*
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* Hotplug handler interface.
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*
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* Copyright (c) 2014 Red Hat Inc.
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*
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* Authors:
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* Igor Mammedov <imammedo@redhat.com>,
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/hotplug.h"
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#include "qemu/module.h"
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void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
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DeviceState *plugged_dev,
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Error **errp)
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{
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HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
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if (hdc->pre_plug) {
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hdc->pre_plug(plug_handler, plugged_dev, errp);
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}
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}
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void hotplug_handler_plug(HotplugHandler *plug_handler,
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DeviceState *plugged_dev,
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Error **errp)
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{
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HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
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if (hdc->plug) {
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hdc->plug(plug_handler, plugged_dev, errp);
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}
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}
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void hotplug_handler_unplug_request(HotplugHandler *plug_handler,
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DeviceState *plugged_dev,
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Error **errp)
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{
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HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
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if (hdc->unplug_request) {
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hdc->unplug_request(plug_handler, plugged_dev, errp);
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}
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}
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void hotplug_handler_unplug(HotplugHandler *plug_handler,
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DeviceState *plugged_dev,
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Error **errp)
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{
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HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
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if (hdc->unplug) {
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hdc->unplug(plug_handler, plugged_dev, errp);
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}
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}
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static const TypeInfo hotplug_handler_info = {
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.name = TYPE_HOTPLUG_HANDLER,
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.parent = TYPE_INTERFACE,
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.class_size = sizeof(HotplugHandlerClass),
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};
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static void hotplug_handler_register_types(void)
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{
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type_register_static(&hotplug_handler_info);
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}
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type_init(hotplug_handler_register_types)
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