block: make printk_partition use the class iterator function

Use the proper class iterator function instead of mucking around in the
internals of the class structures.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

block/genhd.c

@@ -227,29 +227,25 @@ struct gendisk *get_gendisk(dev_t devt, int *part)
 }
 
 /*
- * print a full list of all partitions - intended for places where the root
- * filesystem can't be mounted and thus to give the victim some idea of what
- * went wrong
+ * print a partitions - intended for places where the root filesystem can't be
+ * mounted and thus to give the victim some idea of what went wrong
  */
-void __init printk_all_partitions(void)
+static int printk_partition(struct device *dev, void *data)
 {
-	struct device *dev;
 	struct gendisk *sgp;
 	char buf[BDEVNAME_SIZE];
 	int n;
 
-	mutex_lock(&block_class_lock);
-	/* For each block device... */
-	list_for_each_entry(dev, &block_class.devices, node) {
 	if (dev->type != &disk_type)
-			continue;
+		goto exit;
+
 	sgp = dev_to_disk(dev);
 	/*
 	 * Don't show empty devices or things that have been surpressed
 	 */
 	if (get_capacity(sgp) == 0 ||
 	    (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
-			continue;
+		goto exit;
 
 	/*
 	 * Note, unlike /proc/partitions, I am showing the numbers in
@@ -269,16 +265,27 @@ void __init printk_all_partitions(void)
 	/* now show the partitions */
 	for (n = 0; n < sgp->minors - 1; ++n) {
 		if (sgp->part[n] == NULL)
-				continue;
+			goto exit;
 		if (sgp->part[n]->nr_sects == 0)
-				continue;
+			goto exit;
 		printk("  %02x%02x %10llu %s\n",
 			sgp->major, n + 1 + sgp->first_minor,
 			(unsigned long long)sgp->part[n]->nr_sects >> 1,
 			disk_name(sgp, n + 1, buf));
 	}
-	}
+exit:
+	return 0;
+}
 
+/*
+ * print a full list of all partitions - intended for places where the root
+ * filesystem can't be mounted and thus to give the victim some idea of what
+ * went wrong
+ */
+void __init printk_all_partitions(void)
+{
+	mutex_lock(&block_class_lock);
+	class_for_each_device(&block_class, NULL, NULL, printk_partition);
 	mutex_unlock(&block_class_lock);
 }