[Qemu-devel] [PATCH 4/8] exec: make address_space_cache_destroy idempotent

[Paolo Bonzini <pbonzini@redhat.com>]

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

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 exec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/exec.c b/exec.c
index f2bed92..5de15cf 100644
--- a/exec.c
+++ b/exec.c
@@ -3165,6 +3165,7 @@ 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
-- 
2.9.3