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qdev: Free QemuOpts when the QOM path goes away 

Otherwise there is a race where the DEVICE_DELETED event has been sent but
attempts to reuse the ID will fail.

Note that similar races exist for other QemuOpts, which this patch
does not attempt to fix.

For example, if the device is a block device, then unplugging it also
deletes its backend.  However, this backend's get deleted in
drive_info_del(), which is only called when properties are
destroyed.  Just like device_finalize(), drive_info_del() is called
some time after DEVICE_DELETED is sent.  A separate patch series has
been sent to plug this other bug.  Character devices also have yet to
be fixed.

Reported-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Paolo Bonzini 2015-10-19 13:11:39 +02:00 committed by Andreas Färber
parent 7746abd8e9
commit abed886ec6
1 changed files with 3 additions and 1 deletions
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4
hw/core/qdev.c
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@ -1206,7 +1206,6 @@ 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);
@ -1254,6 +1253,9 @@ static void device_unparent(Object *obj)
qapi_event_send_device_deleted(!!dev->id, dev->id, path, &error_abort);
g_free(path);
}
qemu_opts_del(dev->opts);
dev->opts = NULL;
}
static void device_class_init(ObjectClass *class, void *data)