target/linux/generic/pending-5.4/999-2329-ubi-add-configurable-rootdev.patch

From 27ae9a1b684cd183ccf6881d32710b8890113d20 Mon Sep 17 00:00:00 2001
From: Sam Shih <sam.shih@mediatek.com>
Date: Fri, 2 Jun 2023 13:06:14 +0800
Subject: [PATCH] 
 [spi-and-storage][999-2329-ubi-add-configurable-rootdev.patch]

---
 drivers/mtd/ubi/block.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 873f9cb24..33e969fd3 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -97,6 +97,12 @@ static DEFINE_IDR(ubiblock_minor_idr);
 static DEFINE_MUTEX(devices_mutex);
 static int ubiblock_major;
 
+static char rootfs_volume[256] = "rootfs";
+module_param_string(rootfs_volume, rootfs_volume, sizeof(rootfs_volume), 0444);
+
+static bool no_default_rootdev;
+module_param(no_default_rootdev, bool, 0444);
+
 static int __init ubiblock_set_param(const char *val,
 				     const struct kernel_param *kp)
 {
@@ -460,8 +466,9 @@ int ubiblock_create(struct ubi_volume_info *vi)
 		 dev->ubi_num, dev->vol_id, vi->name);
 	mutex_unlock(&devices_mutex);
 
-	if (!strcmp(vi->name, "rootfs") &&
+	if (!strcmp(vi->name, rootfs_volume) &&
 	    IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
+	    !no_default_rootdev &&
 	    ROOT_DEV == 0) {
 		pr_notice("ubiblock: device ubiblock%d_%d (%s) set to be root filesystem\n",
 			  dev->ubi_num, dev->vol_id, vi->name);
@@ -681,7 +688,7 @@ static void __init ubiblock_create_auto_rootfs(void)
 	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);
+		desc = ubi_open_volume_nm(ubi_num, rootfs_volume, UBI_READONLY);
 		if (IS_ERR(desc))
 			continue;
 
-- 
2.34.1