[SCSI] qla2xxx: Enable queue-full throttling when UNDERRUN detected.

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>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 6e19769..df69dc0 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -987,6 +987,22 @@ 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;