net/802/mrp: fix possible race condition when calling mrp_pdu_queue()
(Adapted from a very similar change to net/802/garp.c by Cong Wang.) mrp_pdu_queue() should ways be called with the applicant spin lock. mrp_uninit_applicant() only holds the rtnl lock which is not enough; a race is possible because mrp_rcv() is called in BH context: mrp_rcv() |->mrp_pdu_parse_msg() |->mrp_pdu_parse_vecattr() |->mrp_pdu_parse_vecattr_event() |-> mrp_attr_event() |-> mrp_pdu_append_vecattr_event() |-> mrp_pdu_queue() Cc: Cong Wang <amwang@redhat.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David Ward <david.ward@ll.mit.edu> Acked-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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