[SCSI] qla4xxx: Clear DDB map index on the basis of AEN.

Unable to login to session if login-logout issued consecutively for
multiple sessions. Solution is to clear idx in DDB map on the basis
of no-active connection asynchronous event (AEN).

JIRA Key: UPSISCSI-135

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 14 insertions, 9 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_init.c b/drivers/scsi/qla4xxx/ql4_init.c
index 064a3a311e7..ca155bb9fd0 100644
--- a/drivers/scsi/qla4xxx/ql4_init.c
+++ b/drivers/scsi/qla4xxx/ql4_init.c
@@ -880,6 +880,10 @@ int qla4xxx_process_ddb_changed(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
         if (ddb_entry == NULL) {
                 ql4_printk(KERN_ERR, ha, "%s: No ddb_entry at FW index [%d]\n",
                            __func__, fw_ddb_index);
+
+                if (state == DDB_DS_NO_CONNECTION_ACTIVE)
+                        clear_bit(fw_ddb_index, ha->ddb_idx_map);
+
                 goto exit_ddb_event;
         }
 
@@ -910,7 +914,8 @@ int qla4xxx_process_ddb_changed(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
                 }
                 break;
         case DDB_DS_SESSION_ACTIVE:
-                if (state == DDB_DS_SESSION_FAILED) {
+                switch (state) {
+                case DDB_DS_SESSION_FAILED:
                         /*
                          * iscsi_session failure  will cause userspace to
                          * stop the connection which in turn would block the
@@ -919,6 +924,11 @@ int qla4xxx_process_ddb_changed(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
                         iscsi_session_failure(ddb_entry->sess->dd_data,
                                               ISCSI_ERR_CONN_FAILED);
                         status = QLA_SUCCESS;
+                        break;
+                case DDB_DS_NO_CONNECTION_ACTIVE:
+                        clear_bit(fw_ddb_index, ha->ddb_idx_map);
+                        status = QLA_SUCCESS;
+                        break;
                 }
                 break;
         default:
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 5266d97640c..bea78a7f6bc 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -1004,6 +1004,7 @@ qla4xxx_session_create(struct iscsi_endpoint *ep,
         qla_ep = ep->dd_data;
         dst_addr = (struct sockaddr *)&qla_ep->dst_addr;
         ha = to_qla_host(qla_ep->host);
+
 get_ddb_index:
         ddb_index = find_first_zero_bit(ha->ddb_idx_map, MAX_DDB_ENTRIES);
 
@@ -1063,6 +1064,8 @@ static void qla4xxx_session_destroy(struct iscsi_cls_session *cls_sess)
         ddb_entry = sess->dd_data;
         ha = ddb_entry->ha;
 
+        qla4xxx_clear_ddb_entry(ha, ddb_entry->fw_ddb_index);
+
         spin_lock_irqsave(&ha->hardware_lock, flags);
         qla4xxx_free_ddb(ha, ddb_entry);
         spin_unlock_irqrestore(&ha->hardware_lock, flags);
@@ -1183,14 +1186,6 @@ static void qla4xxx_conn_destroy(struct iscsi_cls_conn *cls_conn)
         options = LOGOUT_OPTION_CLOSE_SESSION;
         if (qla4xxx_session_logout_ddb(ha, ddb_entry, options) == QLA_ERROR)
                 ql4_printk(KERN_ERR, ha, "%s: Logout failed\n", __func__);
-        else
-                qla4xxx_clear_ddb_entry(ha, ddb_entry->fw_ddb_index);
-
-        /*
-         * Clear the DDB bit so that next login can use the bit
-         * if FW is not clearing the DDB entry then set DDB will fail anyways
-         */
-        clear_bit(ddb_entry->fw_ddb_index, ha->ddb_idx_map);
 }
 
 static void qla4xxx_task_work(struct work_struct *wdata)