linux-kernel - [PATCH 4.4 070/105] scsi: zfcp: fix missing REC trigger trace on enqueue without ERP thread

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Message-Id: <20180701153154.559454493@linuxfoundation.org>
Date:   Sun,  1 Jul 2018 18:02:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Steffen Maier <maier@...ux.ibm.com>,
        Benjamin Block <bblock@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.4 070/105] scsi: zfcp: fix missing REC trigger trace on enqueue without ERP thread

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

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

From: Steffen Maier <maier@...ux.ibm.com>

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@...ux.ibm.com>
Cc: <stable@...r.kernel.org> #2.6.38+
Reviewed-by: Benjamin Block <bblock@...ux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -314,8 +314,11 @@ 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)