diff -drupN a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
--- a/drivers/mtd/mtdpart.c	2018-08-06 17:23:04.000000000 +0300
+++ b/drivers/mtd/mtdpart.c	2022-06-12 05:28:14.000000000 +0300
@@ -481,6 +481,7 @@ static struct mtd_part *allocate_partiti
 	if (master->_put_device)
 		slave->mtd._put_device = part_put_device;
 
+	slave->mtd.priv = master;
 	slave->mtd._erase = part_erase;
 	slave->master = master;
 	slave->offset = part->offset;
@@ -785,6 +786,7 @@ EXPORT_SYMBOL_GPL(deregister_mtd_parser)
 static const char * const default_mtd_part_types[] = {
 	"cmdlinepart",
 	"ofpart",
+	"sunxipart",
 	NULL
 };