disk: part: use common api to lookup part driver

Do not need to scan disk every time when we get part info
by name.
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>
[trini: Fix build in !CONFIG_HAVE_BLOCK_DEVICE case]
Signed-off-by: NTom Rini <trini@konsulko.com>

disk/part.c

@@ -26,7 +26,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#ifdef CONFIG_HAVE_BLOCK_DEVICE
 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
 {
 	struct part_driver *drv =
@@ -55,6 +54,7 @@ static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
 	return NULL;
 }
 
+#ifdef CONFIG_HAVE_BLOCK_DEVICE
 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
 {
 	struct blk_desc *dev_desc;
@@ -644,28 +644,25 @@ cleanup:
 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 			       disk_partition_t *info, int part_type)
 {
-	struct part_driver *first_drv =
-		ll_entry_start(struct part_driver, part_driver);
-	const int n_drvs = ll_entry_count(struct part_driver, part_driver);
 	struct part_driver *part_drv;
-
-	for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
-		int ret;
-		int i;
-		for (i = 1; i < part_drv->max_entries; i++) {
-			if (part_type >= 0 && part_type != part_drv->part_type)
-				break;
-			ret = part_drv->get_info(dev_desc, i, info);
-			if (ret != 0) {
-				/* no more entries in table */
-				break;
-			}
-			if (strcmp(name, (const char *)info->name) == 0) {
-				/* matched */
-				return i;
-			}
+	int ret;
+	int i;
+
+	part_drv = part_driver_lookup_type(dev_desc);
+	if (!part_drv)
+		return -1;
+	for (i = 1; i < part_drv->max_entries; i++) {
+		ret = part_drv->get_info(dev_desc, i, info);
+		if (ret != 0) {
+			/* no more entries in table */
+			break;
+		}
+		if (strcmp(name, (const char *)info->name) == 0) {
+			/* matched */
+			return i;
 		}
 	}
+
 	return -1;
 }