kernel: mtd: ubi: avoid attaching "linux,ubi" mtd again

"linux,ubi" compatible MTD device can be automatically attached early
since commit fc153aa. Therefore, there is no need to attach MTD
devices named "ubi" or "data" again.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>

Author: DragonBluep

target/linux/generic/pending-6.6/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch

@@ -8,7 +8,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 
 --- a/drivers/mtd/ubi/build.c
 +++ b/drivers/mtd/ubi/build.c
-@@ -1258,6 +1258,74 @@ static struct mtd_notifier ubi_mtd_notif
+@@ -1258,6 +1258,80 @@ static struct mtd_notifier ubi_mtd_notif
  	.remove = ubi_notify_remove,
  };
 
@@ -21,6 +21,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 +{
 +	int err;
 +	struct mtd_info *mtd;
++	struct device_node *np;
 +	loff_t offset = 0;
 +	size_t len;
 +	char magic[4];
@@ -33,6 +34,11 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 +	if (IS_ERR(mtd))
 +		return;
 +
++	/* skip "linux,ubi" mtd as it has already been attached */
++	np = mtd_get_of_node(mtd);
++	if (of_device_is_compatible(np, "linux,ubi"))
++		goto cleanup;
++
 +	/* get the first not bad block */
 +	if (mtd_can_have_bb(mtd))
 +		while (mtd_block_isbad(mtd, offset)) {
@@ -83,7 +89,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  static int __init ubi_init_attach(void)
  {
  	int err, i, k;
-@@ -1308,6 +1376,12 @@ static int __init ubi_init_attach(void)
+@@ -1308,6 +1382,12 @@ static int __init ubi_init_attach(void)
  		}
  	}