dma_controller_remove_regions: reset region array (#413)

Prepare this function for re-usability by clearing the array after removal.

Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/dma.c b/lib/dma.c
index d3db436..c524989 100644
--- a/lib/dma.c
+++ b/lib/dma.c
@@ -199,6 +199,9 @@ dma_controller_remove_regions(dma_controller_t *dma)
             assert(region->fd == -1);
         }
     }
+
+    memset(dma->regions, 0, dma->max_regions * sizeof(dma->regions[0]));
+    dma->nregions = 0;
 }
 
 void