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[ Upstream commit94a72b3f02] NLM_F_MULTI must be used only when a NLMSG_DONE message is sent at the end. In fact, NLMSG_DONE is sent only at the end of a dump. Libraries like libnl will wait forever for NLMSG_DONE. Fixes:949f1e39a6("bridge: mdb: notify on router port add and del") CC: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>