[PATCH 10/14] qla2xxx: Enable queue-full throttling when UNDERRUN detected.

[Andrew Vasquez <andrew.vasquez@qlogic.com>]

As ISP24xx firmware can return a CS_DATA_UNDERRUN completion
status when the storage has returned a
SAM_STAT_TASK_SET_FULL scsi-status.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
---
 drivers/scsi/qla2xxx/qla_isr.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index fe8a264..3cd34ba 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -991,6 +991,22 @@ qla2x00_status_entry(scsi_qla_host_t *ha, void *pkt)
 		if (lscsi_status != 0) {
 			cp->result = DID_OK << 16 | lscsi_status;
 
+			if (lscsi_status == SAM_STAT_TASK_SET_FULL) {
+				DEBUG2(printk(KERN_INFO
+				    "scsi(%ld): QUEUE FULL status detected "
+				    "0x%x-0x%x.\n", ha->host_no, comp_status,
+				    scsi_status));
+
+				/*
+				 * Adjust queue depth for all luns on the
+				 * port.
+				 */
+				fcport->last_queue_full = jiffies;
+				starget_for_each_device(
+				    cp->device->sdev_target, fcport,
+				    qla2x00_adjust_sdev_qdepth_down);
+				break;
+			}
 			if (lscsi_status != SS_CHECK_CONDITION)
 				break;
 
-- 
1.5.0.rc2.gdbaa0