openwrtv3/target/linux/generic/patches-3.13/404-mtd-use-mtd_get_squashfs_len-in-split_squasfh.patch

--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -670,43 +670,16 @@ mtd_pad_erasesize(struct mtd_info *mtd, 
 	return len;
 }
 
-#define ROOTFS_SPLIT_NAME "rootfs_data"
-
-struct squashfs_super_block {
-	__le32 s_magic;
-	__le32 pad0[9];
-	__le64 bytes_used;
-};
-
-
 static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
 {
-	struct squashfs_super_block sb;
+	size_t squashfs_len;
 	int len, ret;
 
-	ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
-	if (ret || (len != sizeof(sb))) {
-		printk(KERN_ALERT "split_squashfs: error occured while reading "
-			"from \"%s\"\n", master->name);
-		return -EINVAL;
-	}
-
-	if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
-		printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
-			master->name);
-		*split_offset = 0;
-		return 0;
-	}
-
-	if (le64_to_cpu((sb.bytes_used)) <= 0) {
-		printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
-			master->name);
-		*split_offset = 0;
-		return 0;
-	}
+	ret = mtd_get_squashfs_len(master, offset, &squashfs_len);
+	if (ret)
+		return ret;
 
-	len = (u32) le64_to_cpu(sb.bytes_used);
-	len = mtd_pad_erasesize(master, offset, len);
+	len = mtd_pad_erasesize(master, offset, squashfs_len);
 	*split_offset = offset + len;
 
 	return 0;
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -20,6 +20,7 @@ config MTD_ROOTFS_ROOT_DEV
 
 config MTD_ROOTFS_SPLIT
 	bool "Automatically split 'rootfs' partition for squashfs"
+	select MTD_SPLIT
 	default y
 
 config MTD_SPLIT_FIRMWARE