Re: [PATCH 1/1] ibmvfc: Fix for offlining devices during error recovery

[Robert Jennings <rcj@linux.vnet.ibm.com>]

* Brian King (brking@linux.vnet.ibm.com) wrote:
> 
> This fixes an issue seen with devices getting marked offline
> in a scenario where a VIOS was getting rebooted while a
> client VFC adapter is in SCSI EH and prevents unnecessary
> EH escalation in some scenarios.
> 
> Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Robert Jennings <rcj@linux.vnet.ibm.com>
> ---
> 
>  drivers/scsi/ibmvscsi/ibmvfc.c |   15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff -puN drivers/scsi/ibmvscsi/ibmvfc.c~ibmvfc_abort_during_reset drivers/scsi/ibmvscsi/ibmvfc.c
> --- linux/drivers/scsi/ibmvscsi/ibmvfc.c~ibmvfc_abort_during_reset	2013-08-06 15:10:04.000000000 -0500
> +++ linux-bjking1/drivers/scsi/ibmvscsi/ibmvfc.c	2013-08-06 15:10:04.000000000 -0500
> @@ -2208,7 +2208,10 @@ static int ibmvfc_cancel_all(struct scsi
> 
>  	if (rsp_rc != 0) {
>  		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
> -		return -EIO;
> +		/* If failure is received, the host adapter is most likely going
> +		 through reset, return success so the caller will wait for the command
> +		 being cancelled to get returned */
> +		return 0;
>  	}
> 
>  	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
> @@ -2221,7 +2224,15 @@ static int ibmvfc_cancel_all(struct scsi
> 
>  	if (status != IBMVFC_MAD_SUCCESS) {
>  		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
> -		return -EIO;
> +		switch (status) {
> +		case IBMVFC_MAD_DRIVER_FAILED:
> +		case IBMVFC_MAD_CRQ_ERROR:
> +			/* Host adapter most likely going through reset, return success to
> +			 the caller will wait for the command being cancelled to get returned */
> +			return 0;
> +		default:
> +			return -EIO;
> +		};
>  	}
> 
>  	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
> _