linux-kernel - [PATCH 3.10 048/139] scsi: zfcp: fix missing trace records for early returns in TMF eh handlers

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Message-Id: <1509571578-4803-4-git-send-email-w@1wt.eu>
Date:   Wed,  1 Nov 2017 22:26:17 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Steffen Maier <maier@...ux.vnet.ibm.com>,
        Benjamin Block <bblock@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 048/139] scsi: zfcp: fix missing trace records for early returns in TMF eh handlers

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

commit 1a5d999ebfc7bfe28deb48931bb57faa8e4102b6 upstream.

For problem determination we need to see that we were in scsi_eh
as well as whether and why we were successful or not.

The following commits introduced new early returns without adding
a trace record:

v2.6.35 commit a1dbfddd02d2
("[SCSI] zfcp: Pass return code from fc_block_scsi_eh to scsi eh")
on fc_block_scsi_eh() returning != 0 which is FAST_IO_FAIL,

v2.6.30 commit 63caf367e1c9
("[SCSI] zfcp: Improve reliability of SCSI eh handlers in zfcp")
on not having gotten an FSF request after the maximum number of retry
attempts and thus could not issue a TMF and has to return FAILED.

Signed-off-by: Steffen Maier <maier@...ux.vnet.ibm.com>
Fixes: a1dbfddd02d2 ("[SCSI] zfcp: Pass return code from fc_block_scsi_eh to scsi eh")
Fixes: 63caf367e1c9 ("[SCSI] zfcp: Improve reliability of SCSI eh handlers in zfcp")
Cc: <stable@...r.kernel.org> 
Reviewed-by: Benjamin Block <bblock@...ux.vnet.ibm.com>
Signed-off-by: Benjamin Block <bblock@...ux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/s390/scsi/zfcp_scsi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 66c37e7..01be6fc 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -294,8 +294,10 @@ static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 
 		zfcp_erp_wait(adapter);
 		ret = fc_block_scsi_eh(scpnt);
-		if (ret)
+		if (ret) {
+			zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 			return ret;
+		}
 
 		if (!(atomic_read(&adapter->status) &
 		      ZFCP_STATUS_COMMON_RUNNING)) {
@@ -303,8 +305,10 @@ static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 			return SUCCESS;
 		}
 	}
-	if (!fsf_req)
+	if (!fsf_req) {
+		zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 		return FAILED;
+	}
 
 	wait_for_completion(&fsf_req->completion);
 
-- 
2.8.0.rc2.1.gbe9624a