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

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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@xxxxxxxxxxxxxxxxxx>
---

 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");
_

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