@@ -1624,8 +1624,13 @@ static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
rc = fc_exch_done_locked(ep);
WARN_ON(fc_seq_exch(sp) != ep);
spin_unlock_bh(&ep->ex_lock);
- if (!rc)
+ if (!rc) {
fc_exch_delete(ep);
+ } else {
+ FC_EXCH_DBG(ep, " ep is completed already,
+ hence skip calling the resp\n");
+ goto skip_resp;
+ }
}
/*
@@ -1644,6 +1649,7 @@ static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
if (!fc_invoke_resp(ep, sp, fp))
fc_frame_free(fp);
+skip_resp:
fc_exch_release(ep);
return;
rel:
@@ -1900,10 +1906,16 @@ static void fc_exch_reset(struct fc_exch *ep)
fc_exch_hold(ep);
- if (!rc)
+ if (!rc) {
fc_exch_delete(ep);
+ } else {
+ FC_EXCH_DBG(ep, " ep is completed already,
+ hence skip calling the resp\n");
+ goto skip_resp;
+ }
fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED));
+skip_resp:
fc_seq_set_resp(sp, NULL, ep->arg);
fc_exch_release(ep);
}
Issue :- race condition getting hit between the response handler get called because of the exchange_mgr_reset() which clear out all the active XID and the response we get via interrupt as the same time Below are the sequence of events occurring in case of "issue/race condition" :- rport ba0200: Port timeout, state PLOGI rport ba0200: Port entered PLOGI state from PLOGI state xid 1052: Exchange timer armed : 20000 msecs xid timer armed here rport ba0200: Received LOGO request while in state PLOGI rport ba0200: Delete port rport ba0200: work event 3 rport ba0200: lld callback ev 3 bnx2fc: rport_event_hdlr: event = 3, port_id = 0xba0200 bnx2fc: ba0200 - rport not created Yet!! /* Here we reset any outstanding exchanges before freeing rport using the exch_mgr_reset() */ xid 1052: Exchange timer canceled /*Here we got two response for one xid*/ xid 1052: invoking resp(), esb 20000000 state 3 xid 1052: invoking resp(), esb 20000000 state 3 xid 1052: fc_rport_plogi_resp() : ep->resp_active 2 xid 1052: fc_rport_plogi_resp() : ep->resp_active 2 Signed-off-by: Javed Hasan <jhasan@marvell.com>