[PATCHv2 6/7] libfc: don't advance state machine for incoming FLOGI

[Hannes Reinecke <hare@suse.de>]

When we receive an FLOGI but have already sent our own we should
not advance the state machine but rather wait for our FLOGI to
return before continuing with PLOGI.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
---
 drivers/scsi/libfc/fc_rport.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index 72a7183..4b9bb6d 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -765,8 +765,10 @@ static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
 		goto bad;
 
 	flogi = fc_frame_payload_get(fp, sizeof(*flogi));
-	if (!flogi)
+	if (!flogi) {
+		FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
 		goto bad;
+	}
 	r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
 	if (r_a_tov > rdata->r_a_tov)
 		rdata->r_a_tov = r_a_tov;
@@ -783,7 +785,6 @@ put:
 	kref_put(&rdata->kref, lport->tt.rport_destroy);
 	return;
 bad:
-	FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
 	fc_rport_error_retry(rdata, fp);
 	goto out;
 }
@@ -925,10 +926,17 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
 	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
 	lport->tt.frame_send(lport, fp);
 
-	if (rdata->ids.port_name < lport->wwpn)
-		fc_rport_enter_plogi(rdata);
-	else
-		fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
+	/*
+	 * Do not proceed with the state machine if our
+	 * FLOGI has crossed with an FLOGI from the
+	 * remote port; wait for the FLOGI response instead.
+	 */
+	if (rdata->rp_state != RPORT_ST_FLOGI) {
+		if (rdata->ids.port_name < lport->wwpn)
+			fc_rport_enter_plogi(rdata);
+		else
+			fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
+	}
 out:
 	mutex_unlock(&rdata->rp_mutex);
 	kref_put(&rdata->kref, lport->tt.rport_destroy);
-- 
1.8.5.6