svn commit: r355133 - stable/12/sys/net

[Vincenzo Maffione]

Author: vmaffione
Date: Wed Nov 27 18:52:01 2019
New Revision: 355133
URL: https://svnweb.freebsd.org/changeset/base/355133

Log:
  MFC r354867:
  
  netmap: check if we already ran mmap before we attempt it
  
  Submitted by:   neel at neelc.org
  Reviewed by:    vmaffione
  Differential Revision:  https://reviews.freebsd.org/D22390

Modified:
  stable/12/sys/net/netmap_user.h
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/net/netmap_user.h
==============================================================================
--- stable/12/sys/net/netmap_user.h	Wed Nov 27 16:52:46 2019	(r355132)
+++ stable/12/sys/net/netmap_user.h	Wed Nov 27 18:52:01 2019	(r355133)
@@ -981,7 +981,8 @@ nm_close(struct nm_desc *d)
 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) {