[SCSI] libfc: make rport module maintain the rport list

The list of remote ports (struct fc_rport_priv) has been
maintained by the discovery module.  In preparation for having
lport->tt.rport_create() do a lookup first, maintain the
rports list in the rport module.  It will still be protected
by the disc_mutex.

The DNS rport is an exception for until after further patches.
For now, do not add it to the list.

The point-to-point rport will be in the discovery list.
So at shutdown, it doesn't need to be separately logged out.

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>

3 files changed, 15 insertions, 18 deletions

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index 8427396909e8..e6b13bfecf73 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -115,9 +115,6 @@ static void fc_disc_rport_callback(struct fc_lport *lport,
         case RPORT_EV_LOGO:
         case RPORT_EV_FAILED:
         case RPORT_EV_STOP:
-                mutex_lock(&disc->disc_mutex);
-                list_del(&rdata->peers);
-                mutex_unlock(&disc->disc_mutex);
                 break;
         default:
                 break;
@@ -385,9 +382,6 @@ static int fc_disc_new_target(struct fc_disc *disc,
                                 rdata = lport->tt.rport_create(lport, ids);
                                 if (!rdata)
                                         error = -ENOMEM;
-                                else
-                                        list_add_tail(&rdata->peers,
-                                                      &disc->rports);
                         }
                 }
                 if (rdata) {
@@ -562,7 +556,6 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
                         rdata = lport->tt.rport_create(lport, &ids);
                         if (rdata) {
                                 rdata->ops = &fc_disc_rport_ops;
-                                list_add_tail(&rdata->peers, &disc->rports);
                                 lport->tt.rport_login(rdata);
                         } else
                                 printk(KERN_WARNING "libfc: Failed to allocate "
@@ -709,7 +702,6 @@ static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp)
         if (rdata) {
                 rdata->ops = &fc_disc_rport_ops;
                 kfree(dp);
-                list_add_tail(&rdata->peers, &disc->rports);
                 lport->tt.rport_login(rdata);
         }
         return;
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 22c0f7bc004f..f33e5732e3fc 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -205,12 +205,11 @@ static void fc_lport_ptp_setup(struct fc_lport *lport,
         ids.node_name = remote_wwnn;
         ids.roles = FC_RPORT_ROLE_UNKNOWN;
 
-        if (lport->ptp_rp) {
+        mutex_lock(&lport->disc.disc_mutex);
+        if (lport->ptp_rp)
                 lport->tt.rport_logoff(lport->ptp_rp);
-                lport->ptp_rp = NULL;
-        }
-
         lport->ptp_rp = lport->tt.rport_create(lport, &ids);
+        mutex_unlock(&lport->disc.disc_mutex);
 
         lport->tt.rport_login(lport->ptp_rp);
 
@@ -931,10 +930,7 @@ static void fc_lport_reset_locked(struct fc_lport *lport)
         if (lport->dns_rp)
                 lport->tt.rport_logoff(lport->dns_rp);
 
-        if (lport->ptp_rp) {
-                lport->tt.rport_logoff(lport->ptp_rp);
-                lport->ptp_rp = NULL;
-        }
+        lport->ptp_rp = NULL;
 
         lport->tt.disc_stop(lport);
 
@@ -1304,7 +1300,9 @@ static void fc_lport_enter_dns(struct fc_lport *lport)
 
         fc_lport_state_enter(lport, LPORT_ST_DNS);
 
+        mutex_lock(&lport->disc.disc_mutex);
         rdata = lport->tt.rport_create(lport, &ids);
+        mutex_unlock(&lport->disc.disc_mutex);
         if (!rdata)
                 goto err;
 
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index 6ecf36d4708c..a9087b31bce9 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -91,8 +91,7 @@ static const char *fc_rport_state_names[] = {
  * @lport: local port.
  * @ids: remote port identifiers.
  *
- * Locking note: this may be called without locks held, but
- * is usually called from discovery with the disc_mutex held.
+ * Locking note:  must be called with the disc_mutex held.
  */
 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
                                              struct fc_rport_identifiers *ids)
@@ -115,6 +114,8 @@ static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
         rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
         INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
         INIT_WORK(&rdata->event_work, fc_rport_work);
+        if (ids->port_id != FC_FID_DIR_SERV)
+                list_add(&rdata->peers, &lport->disc.rports);
         return rdata;
 }
 
@@ -258,6 +259,12 @@ static void fc_rport_work(struct work_struct *work)
                 port_id = rdata->ids.port_id;
                 mutex_unlock(&rdata->rp_mutex);
 
+                if (port_id != FC_FID_DIR_SERV) {
+                        mutex_lock(&lport->disc.disc_mutex);
+                        list_del(&rdata->peers);
+                        mutex_unlock(&lport->disc.disc_mutex);
+                }
+
                 if (rport_ops->event_callback) {
                         FC_RPORT_DBG(rdata, "callback ev %d\n", event);
                         rport_ops->event_callback(lport, rdata, event);