exec: make address_space_cache_destroy idempotent

Clear cache->mr so that address_space_cache_destroy does nothing
the second time it is called.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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>

1 files changed, 1 insertions, 0 deletions

diff --git a/exec.c b/exec.c
index 6fa337b8d8..865a1e8295 100644
--- a/exec.c
+++ b/exec.c
@@ -3166,6 +3166,7 @@ void address_space_cache_destroy(MemoryRegionCache *cache)
         xen_invalidate_map_cache_entry(cache->ptr);
     }
     memory_region_unref(cache->mr);
+    cache->mr = NULL;
 }
 
 /* Called from RCU critical section.  This function has the same