openwrt/target/linux/generic/pending-4.19/492-try-auto-mounting-ubi0-rootfs-in-init-do_mounts.c.patch

From: Daniel Golle <daniel@makrotopia.org>
Subject: try auto-mounting ubi0:rootfs in init/do_mounts.c

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 init/do_mounts.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -427,7 +427,28 @@ retry:
 out:
 	put_page(page);
 }
- 
+
+static int __init mount_ubi_rootfs(void)
+{
+	int flags = MS_SILENT;
+	int err, tried = 0;
+
+	while (tried < 2) {
+		err = do_mount_root("ubi0:rootfs", "ubifs", flags, \
+					root_mount_data);
+		switch (err) {
+			case -EACCES:
+				flags |= MS_RDONLY;
+				tried++;
+				break;
+			default:
+				return err;
+		}
+	}
+
+	return -EINVAL;
+}
+
 #ifdef CONFIG_ROOT_NFS
 
 #define NFSROOT_TIMEOUT_MIN	5
@@ -521,6 +542,10 @@ void __init mount_root(void)
 			change_floppy("root floppy");
 	}
 #endif
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+	if (!mount_ubi_rootfs())
+		return;
+#endif
 #ifdef CONFIG_BLOCK
 	{
 		int err = create_dev("/dev/root", ROOT_DEV);