diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 45fd71d..506f0df 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -916,10 +916,19 @@ static void ahci_host_intr(struct ata_po
 			return;
 	}
 
-	if (ata_ratelimit())
+	if (ata_ratelimit()) {
 		ata_port_printk(ap, KERN_INFO, "spurious interrupt "
 				"(irq_stat 0x%x active_tag %d sactive 0x%x)\n",
 				status, ap->active_tag, ap->sactive);
+		if (status & PORT_IRQ_SDB_FIS) {
+			struct ahci_port_priv *pp = ap->private_data;
+			u32 *sdb_fis = pp->rx_fis + 0x58;
+
+			ata_port_printk(ap, KERN_INFO, "spurious SDB FIS "
+				"%08x:%08x ap->qc_active=%08x qc_active=%08x\n",
+				sdb_fis[0], sdb_fis[1], ap->qc_active, qc_active);
+		}
+	}
 }
 
 static void ahci_irq_clear(struct ata_port *ap)