--- zzzz-none-000/linux-5.4.213/fs/jffs2/build.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/fs/jffs2/build.c	2024-08-14 09:02:08.000000000 +0000
@@ -117,6 +117,16 @@
 	dbg_fsbuild("scanned flash completely\n");
 	jffs2_dbg_dump_block_lists_nolock(c);
 
+	if (c->flags & (1 << 7)) {
+		printk("%s(): unlocking the mtd device... ", __func__);
+		mtd_unlock(c->mtd, 0, c->mtd->size);
+		printk("done.\n");
+
+		printk("%s(): erasing all blocks after the end marker... ", __func__);
+		jffs2_erase_pending_blocks(c, -1);
+		printk("done.\n");
+	}
+
 	dbg_fsbuild("pass 1 starting\n");
 	c->flags |= JFFS2_SB_FLAG_BUILDING;
 	/* Now scan the directory tree, increasing nlink according to every dirent found. */