[SCSI] zfcp: Wait for free SBAL during exchange config

When sending a exchange config data command, wait for a free SBAL.
This does not matter during adapter initialization, but this is
required for pulling adapter statistics during high I/O load.
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/s390/scsi/zfcp_fsf.c

@@ -1927,7 +1927,8 @@ zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
 
 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
-				     0, NULL, &lock_flags, &fsf_req);
+				     ZFCP_WAIT_FOR_SBAL, NULL, &lock_flags,
+				     &fsf_req);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not create exchange configuration "
 			      "data request for adapter %s.\n",