network: use void* to correctly store SetLinkOperation in Request

Previously, when `link_request_queue()` is called in link_request_set_link(),
`SetLinkOperation` is casted with INT_TO_PTR(), and the value is assigned to
`void *object`. However the value was read directly through the member
`SetLinkOperation set_link_operation` of the union which `object`
beloging to. Thus, read value was always 0 on big-endian systems.

Fixes configuring link issue on s390x systems.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/network/networkd-setlink.h b/src/network/networkd-setlink.h
index 87aa26e46f..d3e9f2b9d7 100644
--- a/src/network/networkd-setlink.h
+++ b/src/network/networkd-setlink.h
@@ -21,6 +21,10 @@ typedef enum SetLinkOperation {
         _SET_LINK_OPERATION_INVALID = -EINVAL,
 } SetLinkOperation;
 
+/* SetLinkOperation is casted to int, then stored in void* with INT_TO_PTR(). */
+assert_cc(sizeof(SetLinkOperation) <= sizeof(void*));
+assert_cc(sizeof(SetLinkOperation) <= sizeof(int));
+
 int link_request_to_set_addrgen_mode(Link *link);
 int link_request_to_set_bond(Link *link);
 int link_request_to_set_bridge(Link *link);