[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>
diff --git a/drivers/scsi/qla4xxx/ql4_init.c b/drivers/scsi/qla4xxx/ql4_init.c
index 064a3a3..ca155bb 100644
--- a/drivers/scsi/qla4xxx/ql4_init.c
+++ b/drivers/scsi/qla4xxx/ql4_init.c
@@ -880,6 +880,10 @@
 	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 @@
 		}
 		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 @@
 			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: