From dwery.


Index: linux-2.6.16/drivers/scsi/libata-core.c
===================================================================
--- linux-2.6.16.orig/drivers/scsi/libata-core.c
+++ linux-2.6.16/drivers/scsi/libata-core.c
@@ -4700,6 +4700,9 @@ int ata_device_add(struct ata_probe_ent 
 	       		ap->ioaddr.bmdma_addr,
 	       		ent->irq);
 
+		if (!ent->irq)
+			printk(KERN_INFO "ata%u: polling mode\n", ap->id);
+
 		ata_chk_status(ap);
 		/* This last call probably should be conditional on bmdma */
 		host_set->ops->irq_clear(ap);
@@ -4710,7 +4713,8 @@ int ata_device_add(struct ata_probe_ent 
 		goto err_free_ret;
 
 	/* obtain irq, that is shared between channels */
-	if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
+	if (ent->irq)
+		if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
 			DRV_NAME, host_set))
 		goto err_out;
 
@@ -4793,7 +4797,8 @@ void ata_host_set_remove(struct ata_host
 		scsi_remove_host(ap->host);
 	}
 
-	free_irq(host_set->irq, host_set);
+	if (host_set->irq)
+		free_irq(host_set->irq, host_set);
 
 	for (i = 0; i < host_set->n_ports; i++) {
 		ap = host_set->ports[i];