Patch "scsi: ibmvfc: Fix I/O hang when port is not mapped" has been added to the 4.8-stable tree

Patch "scsi: ibmvfc: Fix I/O hang when port is not mapped" has been added to the 4.8-stable tree

[gregkh]

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

    scsi: ibmvfc: Fix I/O hang when port is not mapped

to the 4.8-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-ibmvfc-fix-i-o-hang-when-port-is-not-mapped.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 07d0e9a847401ffd2f09bd450d41644cd090e81d Mon Sep 17 00:00:00 2001
From: Brian King <brking@linux.vnet.ibm.com>
Date: Mon, 19 Sep 2016 08:59:19 -0500
Subject: scsi: ibmvfc: Fix I/O hang when port is not mapped

From: Brian King <brking@linux.vnet.ibm.com>

commit 07d0e9a847401ffd2f09bd450d41644cd090e81d upstream.

If a VFC port gets unmapped in the VIOS, it may not respond with a CRQ
init complete following H_REG_CRQ. If this occurs, we can end up having
called scsi_block_requests and not a resulting unblock until the init
complete happens, which may never occur, and we end up hanging I/O
requests.  This patch ensures the host action stay set to
IBMVFC_HOST_ACTION_TGT_DEL so we move all rports into devloss state and
unblock unless we receive an init complete.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/ibmvscsi/ibmvfc.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -717,7 +717,6 @@ static int ibmvfc_reset_crq(struct ibmvf
 	spin_lock_irqsave(vhost->host->host_lock, flags);
 	vhost->state = IBMVFC_NO_CRQ;
 	vhost->logged_in = 0;
-	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
 
 	/* Clean out the queue */
 	memset(crq->msgs, 0, PAGE_SIZE);


Patches currently in stable-queue which might be from brking@linux.vnet.ibm.com are

queue-4.8/scsi-ibmvfc-fix-i-o-hang-when-port-is-not-mapped.patch