diff --git a/block/genhd.c b/block/genhd.c
index ed926b7..b76c56b 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -655,8 +655,11 @@ static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos)
 	struct device *dev;
 
 	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
-	if (!iter)
+	if (!iter) {
+		printk("XXX disk_seqf_start: -ENOMEM\n");
 		return ERR_PTR(-ENOMEM);
+	}
+	printk("XXX disk_seqf_start: iter=%p pos=%lld\n", iter, (long long)*pos);
 
 	seqf->private = iter;
 	class_dev_iter_init(iter, &block_class, NULL, &disk_type);
@@ -673,6 +676,8 @@ static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos)
 {
 	struct device *dev;
 
+	printk("XXX disk_seqf_next: iter=%p pos=%lld\n",
+	       seqf->private, (long long)*pos);
 	(*pos)++;
 	dev = class_dev_iter_next(seqf->private);
 	if (dev)
@@ -685,6 +690,7 @@ static void disk_seqf_stop(struct seq_file *seqf, void *v)
 {
 	struct class_dev_iter *iter = seqf->private;
 
+	printk("XXX disk_seqf_stop: iter=%p\n", seqf->private);
 	/* stop is called even after start failed :-( */
 	if (iter) {
 		class_dev_iter_exit(iter);
@@ -697,7 +703,7 @@ static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
 	static void *p;
 
 	p = disk_seqf_start(seqf, pos);
-	if (!IS_ERR(p) && p)
+	if (!IS_ERR(p) && p && !*pos)
 		seq_puts(seqf, "major minor  #blocks  name\n\n");
 	return p;
 }