From: Brian King <brking@linux.vnet.ibm.com>
Date: Mon, 19 Sep 2016 13:59:19 +0000 (-0500)
Subject: scsi: ibmvfc: Fix I/O hang when port is not mapped
X-Git-Tag: v3.2.85~103
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5fe093e5906fd3af9721e7cfd14a617329385c1;p=pandora-kernel.git

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

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: Ben Hutchings <ben@decadent.org.uk>
---

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