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Index: head/sys/net/netmap_user.h
===================================================================
--- head/sys/net/netmap_user.h
+++ head/sys/net/netmap_user.h
@@ -981,7 +981,8 @@
static int
nm_mmap(struct nm_desc *d, const struct nm_desc *parent)
{
- //XXX TODO: check if mmap is already done
+ if (d->done_mmap)
+ return 0;
if (IS_NETMAP_DESC(parent) && parent->mem &&
parent->req.nr_arg2 == d->req.nr_arg2) {

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