ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/generic/pending-5.4/491-ubi-auto-create-ubiblock-device-for-rootfs.patch b/target/linux/generic/pending-5.4/491-ubi-auto-create-ubiblock-device-for-rootfs.patch
new file mode 100644
index 0000000..61fcbac
--- /dev/null
+++ b/target/linux/generic/pending-5.4/491-ubi-auto-create-ubiblock-device-for-rootfs.patch
@@ -0,0 +1,66 @@
+From: Daniel Golle <daniel@makrotopia.org>
+Subject: ubi: auto-create ubiblock device for rootfs
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 42 insertions(+)
+
+--- a/drivers/mtd/ubi/block.c
++++ b/drivers/mtd/ubi/block.c
+@@ -652,6 +652,44 @@ static void __init ubiblock_create_from_
+ }
+ }
+
++#define UBIFS_NODE_MAGIC 0x06101831
++static inline int ubi_vol_is_ubifs(struct ubi_volume_desc *desc)
++{
++ int ret;
++ uint32_t magic_of, magic;
++ ret = ubi_read(desc, 0, (char *)&magic_of, 0, 4);
++ if (ret)
++ return 0;
++ magic = le32_to_cpu(magic_of);
++ return magic == UBIFS_NODE_MAGIC;
++}
++
++static void __init ubiblock_create_auto_rootfs(void)
++{
++ int ubi_num, ret, is_ubifs;
++ struct ubi_volume_desc *desc;
++ struct ubi_volume_info vi;
++
++ for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) {
++ desc = ubi_open_volume_nm(ubi_num, "rootfs", UBI_READONLY);
++ if (IS_ERR(desc))
++ continue;
++
++ ubi_get_volume_info(desc, &vi);
++ is_ubifs = ubi_vol_is_ubifs(desc);
++ ubi_close_volume(desc);
++ if (is_ubifs)
++ break;
++
++ ret = ubiblock_create(&vi);
++ if (ret)
++ pr_err("UBI error: block: can't add '%s' volume, err=%d\n",
++ vi.name, ret);
++ /* always break if we get here */
++ break;
++ }
++}
++
+ static void ubiblock_remove_all(void)
+ {
+ struct ubiblock *next;
+@@ -684,6 +722,10 @@ int __init ubiblock_init(void)
+ */
+ ubiblock_create_from_param();
+
++ /* auto-attach "rootfs" volume if existing and non-ubifs */
++ if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV))
++ ubiblock_create_auto_rootfs();
++
+ /*
+ * Block devices are only created upon user requests, so we ignore
+ * existing volumes.