[PATCH 4.17 144/220] scsi: zfcp: fix missing REC trigger trace on enqueue without ERP thread

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steffen Maier <maier@xxxxxxxxxxxxx>

commit 6a76550841d412330bd86aed3238d1888ba70f0e upstream.

Example trace record formatted with zfcpdbf from s390-tools:

Timestamp      : ...
Area           : REC
Subarea        : 00
Level          : 1
Exception      : -
CPU ID         : ..
Caller         : 0x...
Record ID      : 1                      ZFCP_DBF_REC_TRIG
Tag            : .......
LUN            : 0x...
WWPN           : 0x...
D_ID           : 0x...
Adapter status : 0x...
Port status    : 0x...
LUN status     : 0x...
Ready count    : 0x...
Running count  : 0x...
ERP want       : 0x0.                   ZFCP_ERP_ACTION_REOPEN_...
ERP need       : 0xc0                   ZFCP_ERP_ACTION_NONE

Signed-off-by: Steffen Maier <maier@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> #2.6.38+
Reviewed-by: Benjamin Block <bblock@xxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/s390/scsi/zfcp_erp.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -315,8 +315,11 @@ static int zfcp_erp_action_enqueue(int w
 		goto out;
 	}
 
-	if (!adapter->erp_thread)
-		return -EIO;
+	if (!adapter->erp_thread) {
+		need = ZFCP_ERP_ACTION_NONE; /* marker for trace */
+		retval = -EIO;
+		goto out;
+	}
 
 	need = zfcp_erp_required_act(want, adapter, port, sdev);
 	if (!need)