Patch "scsi: zfcp: fix missing trace records for early returns in TMF eh handlers" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

scsi: zfcp: fix missing trace records for early returns in TMF eh handlers

to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
scsi-zfcp-fix-missing-trace-records-for-early-returns-in-tmf-eh-handlers.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Steffen Maier <[email protected]>
Date: Fri, 28 Jul 2017 12:30:55 +0200
Subject: scsi: zfcp: fix missing trace records for early returns in TMF eh handlers

From: Steffen Maier <[email protected]>

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.

---
 drivers/s390/scsi/zfcp_scsi.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

@@ -245,8 +245,10 @@ static int zfcp_task_mgmt_function(struc
 
 		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)) {

@@ -254,8 +256,10 @@ static int zfcp_task_mgmt_function(struc
 			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);
 

Patches currently in stable-queue which might be from [email protected] are

queue-3.18/scsi-zfcp-add-handling-for-fcp_resid_over-to-the-fcp-ingress-path.patch queue-3.18/scsi-zfcp-trace-high-part-of-new-64-bit-scsi-lun.patch queue-3.18/scsi-zfcp-fix-queuecommand-for-scsi_eh-commands-when-dix-enabled.patch queue-3.18/scsi-zfcp-fix-payload-with-full-fcp_rsp-iu-in-scsi-trace-records.patch queue-3.18/scsi-zfcp-trace-hba-fsf-response-by-default-on-dismiss-or-timedout-late-response.patch queue-3.18/scsi-zfcp-fix-missing-trace-records-for-early-returns-in-tmf-eh-handlers.patch