[SCSI] libfc: fix: empty zone causes endless discovery retries.

On some switches, an empty zone causes GPN_FT to be rejected
with reason 9 (unable) explanation 7 (FC-4 types not registered),
which causes discovery to be retried endlessly.  Treat this as
just an empty response and consider discovery complete.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index 844376c1d8dc..9b8043bdeddb 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -617,6 +617,9 @@ static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
                                     "(check zoning)\n", cp->ct_reason,
                                     cp->ct_explan);
                         event = DISC_EV_FAILED;
+                        if (cp->ct_reason == FC_FS_RJT_UNABL &&
+                            cp->ct_explan == FC_FS_EXP_FTNR)
+                                event = DISC_EV_SUCCESS;
                 } else {
                         FC_DISC_DBG(disc, "GPN_FT unexpected response code "
                                     "%x\n", ntohs(cp->ct_cmd));