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diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -1183,10 +1183,13 @@
if ((bz = dmat->bounce_zone) != NULL) {
free_bounce_pages(dmat, map);
- bz = dmat->bounce_zone;
- bz->free_bpages += map->pagesreserved;
- bz->reserved_bpages -= map->pagesreserved;
- map->pagesreserved = 0;
+ if (map->pagesreserved != 0) {
+ mtx_lock(&bounce_lock);
+ bz->free_bpages += map->pagesreserved;
+ bz->reserved_bpages -= map->pagesreserved;
+ mtx_unlock(&bounce_lock);
+ map->pagesreserved = 0;
+ }
map->pagesneeded = 0;
}
map->sync_count = 0;

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