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Date: Fri, 21 Oct 2016 11:16:06 +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, Brian King <brking@...ux.vnet.ibm.com>, Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com> Subject: [PATCH 4.4 15/25] scsi: ibmvfc: Fix I/O hang when port is not mapped 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Brian King <brking@...ux.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@...ux.vnet.ibm.com> Acked-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);
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