Ack: [PATCH X/Y SRU] scsi: ibmvfc: Fix I/O hang when port is not mapped

[Leann Ogasawara]

On 10/11/2016 08:33 AM, Tim Gardner wrote:
> From: Brian King <brking at linux.vnet.ibm.com>
> 
> BugLink: http://bugs.launchpad.net/bugs/1632116
> 
> 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.
> 
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Brian King <brking at linux.vnet.ibm.com>
> Acked-by: Tyrel Datwyler <tyreld at linux.vnet.ibm.com>
> Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
> (cherry picked from linux-next commit 07d0e9a847401ffd2f09bd450d41644cd090e81d)
> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>

Acked-by: Leann Ogasawara <leann.ogasawara at canonical.com>

> ---
>  drivers/scsi/ibmvscsi/ibmvfc.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
> index 6aa317c..1f9f9e5 100644
> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
> @@ -717,7 +717,6 @@ static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
>  	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);
>