[SCSI] libfc: eliminate rport LOGO state

The LOGO state hasn't been used in a while, except in a brief
transition to DELETE state while holding the rport mutex.
All port LOGO responses have been ignored as well as any timeout
if we don't get a response.

So this patch just removes LOGO state and simplifies the response handler.

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>

2 files changed, 22 insertions, 68 deletions

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index 4d6adf29b4f8..c06d63e4a00f 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -89,7 +89,6 @@ static const char *fc_rport_state_names[] = {
         [RPORT_ST_PRLI] = "PRLI",
         [RPORT_ST_RTV] = "RTV",
         [RPORT_ST_READY] = "Ready",
-        [RPORT_ST_LOGO] = "LOGO",
         [RPORT_ST_ADISC] = "ADISC",
         [RPORT_ST_DELETE] = "Delete",
 };
@@ -514,9 +513,6 @@ static void fc_rport_timeout(struct work_struct *work)
         case RPORT_ST_RTV:
                 fc_rport_enter_rtv(rdata);
                 break;
-        case RPORT_ST_LOGO:
-                fc_rport_enter_logo(rdata);
-                break;
         case RPORT_ST_ADISC:
                 fc_rport_enter_adisc(rdata);
                 break;
@@ -547,7 +543,6 @@ static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
         switch (rdata->rp_state) {
         case RPORT_ST_FLOGI:
         case RPORT_ST_PLOGI:
-        case RPORT_ST_LOGO:
                 rdata->flags &= ~FC_RP_STARTED;
                 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
                 break;
@@ -791,7 +786,6 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
 
         switch (rdata->rp_state) {
         case RPORT_ST_INIT:
-        case RPORT_ST_LOGO:
         case RPORT_ST_DELETE:
                 mutex_unlock(&rdata->rp_mutex);
                 rjt_data.reason = ELS_RJT_FIP;
@@ -1037,52 +1031,6 @@ err:
 }
 
 /**
- * fc_rport_logo_resp() - Handler for logout (LOGO) responses
- * @sp:        The sequence the LOGO was on
- * @fp:        The LOGO response frame
- * @rdata_arg: The remote port that sent the LOGO response
- *
- * Locking Note: This function will be called without the rport lock
- * held, but it will lock, call an _enter_* function or fc_rport_error
- * and then unlock the rport.
- */
-static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
-                               void *rdata_arg)
-{
-        struct fc_rport_priv *rdata = rdata_arg;
-        u8 op;
-
-        mutex_lock(&rdata->rp_mutex);
-
-        FC_RPORT_DBG(rdata, "Received a LOGO %s\n", fc_els_resp_type(fp));
-
-        if (rdata->rp_state != RPORT_ST_LOGO) {
-                FC_RPORT_DBG(rdata, "Received a LOGO response, but in state "
-                             "%s\n", fc_rport_state(rdata));
-                if (IS_ERR(fp))
-                        goto err;
-                goto out;
-        }
-
-        if (IS_ERR(fp)) {
-                fc_rport_error_retry(rdata, fp);
-                goto err;
-        }
-
-        op = fc_frame_payload_op(fp);
-        if (op != ELS_LS_ACC)
-                FC_RPORT_DBG(rdata, "Bad ELS response op %x for LOGO command\n",
-                             op);
-        fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
-
-out:
-        fc_frame_free(fp);
-err:
-        mutex_unlock(&rdata->rp_mutex);
-        kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
-}
-
-/**
  * fc_rport_enter_prli() - Send Process Login (PRLI) request
  * @rdata: The remote port to send the PRLI request to
  *
@@ -1224,6 +1172,24 @@ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
 }
 
 /**
+ * fc_rport_logo_resp() - Handler for logout (LOGO) responses
+ * @sp:        The sequence the LOGO was on
+ * @fp:        The LOGO response frame
+ * @lport_arg: The local port
+ */
+static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+                               void *lport_arg)
+{
+        struct fc_lport *lport = lport_arg;
+
+        FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
+                        "Received a LOGO %s\n", fc_els_resp_type(fp));
+        if (IS_ERR(fp))
+                return;
+        fc_frame_free(fp);
+}
+
+/**
  * fc_rport_enter_logo() - Send a logout (LOGO) request
  * @rdata: The remote port to send the LOGO request to
  *
@@ -1235,23 +1201,14 @@ static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
         struct fc_lport *lport = rdata->local_port;
         struct fc_frame *fp;
 
-        FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n",
+        FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
                      fc_rport_state(rdata));
 
-        fc_rport_state_enter(rdata, RPORT_ST_LOGO);
-
         fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
-        if (!fp) {
-                fc_rport_error_retry(rdata, fp);
+        if (!fp)
                 return;
-        }
-
-        if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
-                                  fc_rport_logo_resp, rdata,
-                                  2 * lport->r_a_tov))
-                fc_rport_error_retry(rdata, NULL);
-        else
-                kref_get(&rdata->kref);
+        (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
+                                   fc_rport_logo_resp, lport, 0);
 }
 
 /**
@@ -1670,7 +1627,6 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport,
                 break;
         case RPORT_ST_FLOGI:
         case RPORT_ST_DELETE:
-        case RPORT_ST_LOGO:
                 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
                              fc_rport_state(rdata));
                 mutex_unlock(&rdata->rp_mutex);
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 8d297f9a0a47..e6f07fba432c 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -103,7 +103,6 @@ enum fc_disc_event {
  * @RPORT_ST_PRLI:    Waiting for PRLI completion
  * @RPORT_ST_RTV:     Waiting for RTV completion
  * @RPORT_ST_READY:   Ready for use
- * @RPORT_ST_LOGO:    Remote port logout (LOGO) sent
  * @RPORT_ST_ADISC:   Discover Address sent
  * @RPORT_ST_DELETE:  Remote port being deleted
 */
@@ -115,7 +114,6 @@ enum fc_rport_state {
         RPORT_ST_PRLI,
         RPORT_ST_RTV,
         RPORT_ST_READY,
-        RPORT_ST_LOGO,
         RPORT_ST_ADISC,
         RPORT_ST_DELETE,
 };