diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 1e5ea5e4992b..bb3373260169 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -578,16 +578,18 @@ void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 }
 
 /**
- * zfcp_dbf_scsi - trace event for scsi commands
- * @tag: identifier for event
- * @sc: pointer to struct scsi_cmnd
- * @fsf: pointer to struct zfcp_fsf_req
+ * zfcp_dbf_scsi_common() - Common trace event helper for scsi.
+ * @tag: Identifier for event.
+ * @level: trace level of event.
+ * @sdev: Pointer to SCSI device as context for this event.
+ * @sc: Pointer to SCSI command, or NULL with task management function (TMF).
+ * @fsf: Pointer to FSF request, or NULL.
  */
-void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
-		   struct zfcp_fsf_req *fsf)
+void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
+			  struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
 {
 	struct zfcp_adapter *adapter =
-		(struct zfcp_adapter *) sc->device->host->hostdata[0];
+		(struct zfcp_adapter *) sdev->host->hostdata[0];
 	struct zfcp_dbf *dbf = adapter->dbf;
 	struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 	struct fcp_resp_with_ext *fcp_rsp;
@@ -599,16 +601,28 @@ void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
 
 	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 	rec->id = ZFCP_DBF_SCSI_CMND;
-	rec->scsi_result = sc->result;
-	rec->scsi_retries = sc->retries;
-	rec->scsi_allowed = sc->allowed;
-	rec->scsi_id = sc->device->id;
-	rec->scsi_lun = (u32)sc->device->lun;
-	rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
-	rec->host_scribble = (unsigned long)sc->host_scribble;
-
-	memcpy(rec->scsi_opcode, sc->cmnd,
-	       min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
+	if (sc) {
+		rec->scsi_result = sc->result;
+		rec->scsi_retries = sc->retries;
+		rec->scsi_allowed = sc->allowed;
+		rec->scsi_id = sc->device->id;
+		rec->scsi_lun = (u32)sc->device->lun;
+		rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
+		rec->host_scribble = (unsigned long)sc->host_scribble;
+
+		memcpy(rec->scsi_opcode, sc->cmnd,
+		       min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
+	} else {
+		rec->scsi_result = ~0;
+		rec->scsi_retries = ~0;
+		rec->scsi_allowed = ~0;
+		rec->scsi_id = sdev->id;
+		rec->scsi_lun = (u32)sdev->lun;
+		rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32);
+		rec->host_scribble = ~0;
+
+		memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
+	}
 
 	if (fsf) {
 		rec->fsf_req_id = fsf->req_id;
diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h
index e2a973cd2573..d116c07ed77a 100644
--- a/drivers/s390/scsi/zfcp_dbf.h
+++ b/drivers/s390/scsi/zfcp_dbf.h
@@ -359,7 +359,7 @@ void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
 					scmd->device->host->hostdata[0];
 
 	if (debug_level_enabled(adapter->dbf->scsi, level))
-		zfcp_dbf_scsi(tag, level, scmd, req);
+		zfcp_dbf_scsi_common(tag, level, scmd->device, scmd, req);
 }
 
 /**
@@ -402,16 +402,23 @@ void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
 }
 
 /**
- * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
- * @tag: tag indicating success or failure of reset operation
- * @scmnd: SCSI command which caused this error recovery
- * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
+ * zfcp_dbf_scsi_devreset() - Trace event for Logical Unit or Target Reset.
+ * @tag: Tag indicating success or failure of reset operation.
+ * @sdev: Pointer to SCSI device as context for this event.
+ * @flag: Indicates type of reset (Target Reset, Logical Unit Reset).
+ * @fsf_req: Pointer to FSF request representing the TMF, or NULL.
  */
 static inline
-void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag,
+void zfcp_dbf_scsi_devreset(char *tag, struct scsi_device *sdev, u8 flag,
 			    struct zfcp_fsf_req *fsf_req)
 {
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *)
+					sdev->host->hostdata[0];
 	char tmp_tag[ZFCP_DBF_TAG_LEN];
+	static int const level = 1;
+
+	if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level)))
+		return;
 
 	if (flag == FCP_TMF_TGT_RESET)
 		memcpy(tmp_tag, "tr_", 3);
@@ -419,7 +426,7 @@ void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag,
 		memcpy(tmp_tag, "lr_", 3);
 
 	memcpy(&tmp_tag[3], tag, 4);
-	_zfcp_dbf_scsi(tmp_tag, 1, scmnd, fsf_req);
+	zfcp_dbf_scsi_common(tmp_tag, level, sdev, NULL, fsf_req);
 }
 
 /**
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 3299bd345076..78bcd80d0509 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -47,8 +47,9 @@ extern void zfcp_dbf_hba_basic(char *, struct zfcp_adapter *);
 extern void zfcp_dbf_san_req(char *, struct zfcp_fsf_req *, u32);
 extern void zfcp_dbf_san_res(char *, struct zfcp_fsf_req *);
 extern void zfcp_dbf_san_in_els(char *, struct zfcp_fsf_req *);
-extern void zfcp_dbf_scsi(char *, int, struct scsi_cmnd *,
-			  struct zfcp_fsf_req *);
+extern void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
+				 struct scsi_cmnd *sc,
+				 struct zfcp_fsf_req *fsf);
 extern void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter,
 			     unsigned int scsi_id, int ret);
 
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 478e7ef9ea2f..0afc546b71df 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -267,7 +267,8 @@ static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 
 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 {
-	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
+	struct scsi_device *sdev = scpnt->device;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 	struct zfcp_fsf_req *fsf_req = NULL;
 	int retval = SUCCESS, ret;
@@ -278,32 +279,32 @@ static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 		if (fsf_req)
 			break;
 
-		zfcp_dbf_scsi_devreset("wait", scpnt, tm_flags, NULL);
+		zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 		zfcp_erp_wait(adapter);
 		ret = fc_block_scsi_eh(scpnt);
 		if (ret) {
-			zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
+			zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 			return ret;
 		}
 
 		if (!(atomic_read(&adapter->status) &
 		      ZFCP_STATUS_COMMON_RUNNING)) {
-			zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
+			zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 			return SUCCESS;
 		}
 	}
 	if (!fsf_req) {
-		zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
+		zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 		return FAILED;
 	}
 
 	wait_for_completion(&fsf_req->completion);
 
 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
-		zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
+		zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 		retval = FAILED;
 	} else {
-		zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
+		zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 		zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 	}
 
