treewide: replace /sys/devices/virtual/ubi by /sys/class/ubi

Starting from Linux Kernel version 6.3 UBI devices will no longer be
considered virtual, but rather have an MTD device parent. Hence they
will no longer be listed under /sys/devices/virtual/ubi which is
used in multiple places in OpenWrt. Prepare for future kernels by
using /sys/class/ubi instead of /sys/devuces/virtual/ubi.

Signed-off-by: Daniel Golle <[email protected]>

package/base-files/files/lib/upgrade/nand.sh

@@ -28,7 +28,7 @@ ubi_mknod() {
 
 nand_find_volume() {
 	local ubidevdir ubivoldir
-	ubidevdir="/sys/devices/virtual/ubi/$1"
+	ubidevdir="/sys/class/ubi/"
 	[ ! -d "$ubidevdir" ] && return 1
 	for ubivoldir in $ubidevdir/${1}_*; do
 		[ ! -d "$ubivoldir" ] && continue
@@ -41,13 +41,12 @@ nand_find_volume() {
 }
 
 nand_find_ubi() {
-	local ubidevdir ubidev mtdnum
+	local ubidevdir ubidev mtdnum cmtdnum
 	mtdnum="$( find_mtd_index $1 )"
 	[ ! "$mtdnum" ] && return 1
-	for ubidevdir in /sys/devices/virtual/ubi/ubi*; do
-		[ ! -d "$ubidevdir" ] && continue
+	for ubidevdir in /sys/class/ubi/ubi*; do
+		[ ! -e "$ubidevdir/mtd_num" ] && continue
 		cmtdnum="$( cat $ubidevdir/mtd_num )"
-		[ ! "$mtdnum" ] && continue
 		if [ "$mtdnum" = "$cmtdnum" ]; then
 			ubidev=$( basename $ubidevdir )
 			ubi_mknod "$ubidevdir"

target/linux/bcm4908/base-files/lib/preinit/75_rootfs_prepare

@@ -23,7 +23,7 @@ rootfs_prepare() {
 	ubinfo /dev/ubi0 -N metadata1 > /dev/null 2>&1 || return
 
 	# Find UBI volume device (e.g. ubi0_123)
-	local ubivol="$(grep rootfs_data /sys/devices/virtual/ubi/ubi*/ubi*/name | sed -n 's/.*\(ubi\d*_\d*\).*/\1/p')"
+	local ubivol="$(grep rootfs_data /sys/class/ubi/ubi*/name | sed -n 's/.*\(ubi\d*_\d*\).*/\1/p')"
 	if [ -n "$ubivol" ]; then
 		bcm4908_verify_rootfs_data $ubivol
 	else

target/linux/ipq40xx/base-files/lib/upgrade/linksys.sh

@@ -3,7 +3,7 @@ linksys_get_target_firmware() {
 
 	cur_boot_part="$(/usr/sbin/fw_printenv -n boot_part)"
 	if [ -z "${cur_boot_part}" ]; then
-		mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
+		mtd_ubi0=$(cat /sys/class/ubi/ubi0/mtd_num)
 		case "$(grep -E "^mtd${mtd_ubi0}:" /proc/mtd | cut -d '"' -f 2)" in
 		kernel|rootfs)
 			cur_boot_part=1

target/linux/ipq806x/base-files/lib/upgrade/linksys.sh

@@ -8,7 +8,7 @@ linksys_get_target_firmware() {
 
 	cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
 	if [ -z "${cur_boot_part}" ] ; then
-		mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
+		mtd_ubi0=$(cat /sys/class/ubi/ubi0/mtd_num)
 		case $(grep -E ^mtd${mtd_ubi0}: /proc/mtd | cut -d '"' -f 2) in
 		kernel1|rootfs1)
 			cur_boot_part=1

target/linux/kirkwood/base-files/lib/upgrade/linksys.sh

@@ -8,7 +8,7 @@ linksys_get_target_firmware() {
 
 	cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
 	if [ -z "${cur_boot_part}" ] ; then
-		mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
+		mtd_ubi0=$(cat /sys/class/ubi/ubi0/mtd_num)
 		case $(grep -E ^mtd${mtd_ubi0}: /proc/mtd | cut -d '"' -f 2) in
 		kernel|rootfs)
 			cur_boot_part=1

target/linux/mvebu/cortexa9/base-files/lib/upgrade/linksys.sh

@@ -8,7 +8,7 @@ linksys_get_target_firmware() {
 
 	cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
 	if [ -z "${cur_boot_part}" ] ; then
-		mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
+		mtd_ubi0=$(cat /sys/class/ubi/ubi0/mtd_num)
 		case $(grep -E ^mtd${mtd_ubi0}: /proc/mtd | cut -d '"' -f 2) in
 		kernel1|rootfs1)
 			cur_boot_part=1