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exec: make address_space_cache_destroy idempotent

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

Backports commit 91047df38dffa80222179f63fbb74c1dfefa25ed from qemu
This commit is contained in:
Paolo Bonzini 2018-03-02 08:16:15 -05:00 committed by Lioncash
parent e66da21a56
commit 37918ba5b0
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qemu/exec.c
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@ -2474,6 +2474,7 @@ void address_space_cache_destroy(MemoryRegionCache *cache)
}
#endif
memory_region_unref(cache->mr);
cache->mr = NULL;
}
/* Called from RCU critical section. This function has the same