---
 drivers/ata/libata-core.c |    1 +
 drivers/ata/libata-eh.c   |    2 ++
 drivers/ata/sata_sil.c    |    6 +++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

Index: tree0/drivers/ata/sata_sil.c
===================================================================
--- tree0.orig/drivers/ata/sata_sil.c
+++ tree0/drivers/ata/sata_sil.c
@@ -398,11 +398,15 @@ static void sil_host_intr(struct ata_por
 			ap->eh_info.serror |= serror;
 		}
 
+		ata_port_printk(ap, KERN_INFO, "XXX SATA_IRQ, serror=0x%x\n",
+				serror);
 		goto freeze;
 	}
 
-	if (unlikely(!qc))
+	if (unlikely(!qc)) {
+		ata_port_printk(ap, KERN_INFO, "XXX DMA completion w/o qc\n");
 		goto freeze;
+	}
 
 	if (unlikely(qc->tf.flags & ATA_TFLAG_POLLING)) {
 		/* this sometimes happens, just clear IRQ */
Index: tree0/drivers/ata/libata-core.c
===================================================================
--- tree0.orig/drivers/ata/libata-core.c
+++ tree0/drivers/ata/libata-core.c
@@ -1361,6 +1361,7 @@ unsigned ata_exec_internal_sg(struct ata
 	/* no internal command while frozen */
 	if (ap->pflags & ATA_PFLAG_FROZEN) {
 		spin_unlock_irqrestore(ap->lock, flags);
+		ata_dev_printk(dev, KERN_INFO, "XXX internal cmd on frozen port\n");
 		return AC_ERR_SYSTEM;
 	}
 
Index: tree0/drivers/ata/libata-eh.c
===================================================================
--- tree0.orig/drivers/ata/libata-eh.c
+++ tree0/drivers/ata/libata-eh.c
@@ -782,6 +782,8 @@ static void __ata_port_freeze(struct ata
 
 	ap->pflags |= ATA_PFLAG_FROZEN;
 
+	ata_port_printk(ap, KERN_INFO, "XXX freezing port\n");
+	dump_stack();
 	DPRINTK("ata%u port frozen\n", ap->print_id);
 }