diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index cb3d8d4..b85e2dd 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -1146,7 +1146,7 @@ remove_cpu_online_rule() {
 }
 
 kdump_check_crypt_targets() {
-    local _luks_dev _devuuid _key_desc
+    local _devuuid _key_desc
     declare -a _luks_devs
 
     mapfile -t _luks_devs < <(get_all_kdump_crypt_dev)
@@ -1175,8 +1175,7 @@ kdump_check_crypt_targets() {
     # shellcheck disable=SC2154
     mkdir -p "$hookdir/initqueue/finished"
     CRYPTSETUP_PATH=$(command -v cryptsetup)
-    for _luks_dev in "${_luks_devs[@]}"; do
-        _devuuid=$(maj_min_to_uuid "$_luks_dev")
+    for _devuuid in "${_luks_devs[@]}"; do
         _key_desc=$LUKS_KEY_PRFIX$_devuuid
         cat << EOF >> "${initdir}/etc/udev/rules.d/70-luks-kdump.rules"
 ENV{ID_FS_UUID}=="$_devuuid", \
diff --git a/kdump-lib.sh b/kdump-lib.sh
index 5a5d08c..7c1e3bc 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -1210,7 +1210,12 @@ kdump_get_arch_recommend_size()
 	get_recommend_size "$_sys_mem" "$_ck_cmdline"
 }
 
-# Print all underlying crypt devices of a block device
+maj_min_to_uuid()
+{
+	lsblk -no uuid,MAJ:MIN | awk -v dev="$1" 'NF==2 && $2 == dev {print $1}'
+}
+
+# Print all underlying crypt devices (UUID) of a block device
 # print nothing if device is not on top of a crypt device
 # $1: the block device to be checked in maj:min format
 get_luks_crypt_dev()
@@ -1221,7 +1226,7 @@ get_luks_crypt_dev()
 
 	_type=$(blkid -u filesystem,crypto -o export -- "/dev/block/$1" | \
 		sed -n -E "s/^TYPE=(.*)$/\1/p")
-	[[ $_type == "crypto_LUKS" ]] && echo "$1"
+	[[ $_type == "crypto_LUKS" ]] && maj_min_to_uuid "$1"
 
 	for _x in "/sys/dev/block/$1/slaves/"*; do
 		[[ -f $_x/dev ]] || continue
@@ -1230,11 +1235,6 @@ get_luks_crypt_dev()
 	done
 }
 
-maj_min_to_uuid()
-{
-	lsblk -no uuid,MAJ:MIN | awk -v dev="$1" 'NF==2 && $2 == dev {print $1}'
-}
-
 # kdump_get_maj_min <device>
 # Prints the major and minor of a device node.
 # Example:
diff --git a/kdumpctl b/kdumpctl
index 7434d17..4e09c76 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -1092,7 +1092,7 @@ _get_luks_key_by_unlock()
 
 prepare_luks()
 {
-	local _luks_dev _key_id _key_des _luks_unlock_cmd
+	local _key_id _key_des _luks_unlock_cmd
 	declare -a _luks_devs
 
 	mapfile -t _luks_devs < <(get_all_kdump_crypt_dev)
@@ -1109,8 +1109,7 @@ prepare_luks()
 	# For the case of CPU/memory hotplugging, we can reuse loaded keys
 	[[ $(cat $LUKS_CONFIGFS/reuse) == 1 ]] && return 0
 
-	for _luks_dev in "${_luks_devs[@]}"; do
-		_devuuid=$(maj_min_to_uuid "$_luks_dev")
+	for _devuuid in "${_luks_devs[@]}"; do
 		_key_dir=$LUKS_CONFIGFS/$_devuuid
 		_key_des=$LUKS_KEY_PRFIX$_devuuid
 		if _key_id=$(keyctl request logon "$_key_des" 2> /dev/null); then