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memory: make memory_listener_unregister idempotent 

Make it easy to unregister a MemoryListener without tracking whether it
had been registered before.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-01-27 16:40:12 +01:00 committed by Michael S. Tsirkin
parent 79c0f397fe
commit 1d8280c18f
1 changed files with 5 additions and 0 deletions
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5
memory.c
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@ -2371,8 +2371,13 @@ void memory_listener_register(MemoryListener *listener, AddressSpace *as)
void memory_listener_unregister(MemoryListener *listener)
{
if (!listener->address_space) {
return;
}
QTAILQ_REMOVE(&memory_listeners, listener, link);
QTAILQ_REMOVE(&listener->address_space->listeners, listener, link_as);
listener->address_space = NULL;
}
void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)