dhcp: stop using refcnt.h

No need to invole atomic ops in single-threaded APIs, let's simplify
this.

8 files changed, 118 insertions, 71 deletions

diff --git a/src/libsystemd-network/dhcp-lease-internal.h b/src/libsystemd-network/dhcp-lease-internal.h
index d6b8aaa2d1..e1d2555505 100644
--- a/src/libsystemd-network/dhcp-lease-internal.h
+++ b/src/libsystemd-network/dhcp-lease-internal.h
@@ -25,7 +25,6 @@
 #include <stdint.h>
 #include <linux/if_packet.h>
 
-#include "refcnt.h"
 #include "util.h"
 #include "list.h"
 
@@ -48,7 +47,7 @@ struct sd_dhcp_raw_option {
 };
 
 struct sd_dhcp_lease {
-        RefCount n_ref;
+        int n_ref;
 
         int32_t time_offset;
         uint32_t t1;
diff --git a/src/libsystemd-network/dhcp-server-internal.h b/src/libsystemd-network/dhcp-server-internal.h
index 24f99f801d..a5d3554e12 100644
--- a/src/libsystemd-network/dhcp-server-internal.h
+++ b/src/libsystemd-network/dhcp-server-internal.h
@@ -26,7 +26,6 @@
 #include "sd-dhcp-server.h"
 
 #include "hashmap.h"
-#include "refcnt.h"
 #include "util.h"
 #include "log.h"
 
@@ -47,7 +46,7 @@ typedef struct DHCPLease {
 } DHCPLease;
 
 struct sd_dhcp_server {
-        RefCount n_ref;
+        unsigned n_ref;
 
         sd_event *event;
         int event_priority;
diff --git a/src/libsystemd-network/dhcp6-lease-internal.h b/src/libsystemd-network/dhcp6-lease-internal.h
index 037f580eb6..4edecf7711 100644
--- a/src/libsystemd-network/dhcp6-lease-internal.h
+++ b/src/libsystemd-network/dhcp6-lease-internal.h
@@ -24,13 +24,11 @@
 
 #include <stdint.h>
 
-#include "refcnt.h"
-
 #include "sd-dhcp6-lease.h"
 #include "dhcp6-internal.h"
 
 struct sd_dhcp6_lease {
-        RefCount n_ref;
+        unsigned n_ref;
 
         uint8_t *serverid;
         size_t serverid_len;
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 46104afded..32af9aa3da 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -27,7 +27,6 @@
 #include <sys/ioctl.h>
 
 #include "util.h"
-#include "refcnt.h"
 #include "random-util.h"
 #include "async.h"
 
@@ -41,7 +40,7 @@
 #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN)
 
 struct sd_dhcp_client {
-        RefCount n_ref;
+        unsigned n_ref;
 
         DHCPState state;
         sd_event *event;
@@ -1676,30 +1675,41 @@ sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
 }
 
 sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) {
-        if (client)
-                assert_se(REFCNT_INC(client->n_ref) >= 2);
+
+        if (!client)
+                return NULL;
+
+        assert(client->n_ref >= 1);
+        client->n_ref++;
 
         return client;
 }
 
 sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) {
-        if (client && REFCNT_DEC(client->n_ref) == 0) {
-                log_dhcp_client(client, "FREE");
 
-                client_initialize(client);
+        if (!client)
+                return NULL;
 
-                client->receive_message =
-                        sd_event_source_unref(client->receive_message);
+        assert(client->n_ref >= 1);
+        client->n_ref--;
 
-                sd_dhcp_client_detach_event(client);
+        if (client->n_ref > 0)
+                return NULL;
 
-                sd_dhcp_lease_unref(client->lease);
+        log_dhcp_client(client, "FREE");
 
-                free(client->req_opts);
-                free(client->hostname);
-                free(client->vendor_class_identifier);
-                free(client);
-        }
+        client_initialize(client);
+
+        client->receive_message = sd_event_source_unref(client->receive_message);
+
+        sd_dhcp_client_detach_event(client);
+
+        sd_dhcp_lease_unref(client->lease);
+
+        free(client->req_opts);
+        free(client->hostname);
+        free(client->vendor_class_identifier);
+        free(client);
 
         return NULL;
 }
@@ -1713,7 +1723,7 @@ int sd_dhcp_client_new(sd_dhcp_client **ret) {
         if (!client)
                 return -ENOMEM;
 
-        client->n_ref = REFCNT_INIT;
+        client->n_ref = 1;
         client->state = DHCP_STATE_INIT;
         client->index = -1;
         client->fd = -1;
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index 482c36ec97..75989951cf 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -195,32 +195,45 @@ int sd_dhcp_lease_get_vendor_specific(sd_dhcp_lease *lease, const uint8_t **data
 }
 
 sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
-        if (lease)
-                assert_se(REFCNT_INC(lease->n_ref) >= 2);
+
+        if (!lease)
+                return NULL;
+
+        assert(lease->n_ref >= 1);
+        lease->n_ref++;
 
         return lease;
 }
 
 sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
-        if (lease && REFCNT_DEC(lease->n_ref) == 0) {
-                while (lease->private_options) {
-                        struct sd_dhcp_raw_option *option = lease->private_options;
 
-                        LIST_REMOVE(options, lease->private_options, option);
+        if (!lease)
+                return NULL;
 
-                        free(option->data);
-                        free(option);
-                }
-                free(lease->hostname);
-                free(lease->domainname);
-                free(lease->dns);
-                free(lease->ntp);
-                free(lease->static_route);
-                free(lease->client_id);
-                free(lease->vendor_specific);
-                free(lease);
+        assert(lease->n_ref >= 1);
+        lease->n_ref--;
+
+        if (lease->n_ref > 0)
+                return NULL;
+
+        while (lease->private_options) {
+                struct sd_dhcp_raw_option *option = lease->private_options;
+
+                LIST_REMOVE(options, lease->private_options, option);
+
+                free(option->data);
+                free(option);
         }
 
+        free(lease->hostname);
+        free(lease->domainname);
+        free(lease->dns);
+        free(lease->ntp);
+        free(lease->static_route);
+        free(lease->client_id);
+        free(lease->vendor_specific);
+        free(lease);
+
         return NULL;
 }
 
@@ -643,7 +656,7 @@ int dhcp_lease_new(sd_dhcp_lease **ret) {
                 return -ENOMEM;
 
         lease->router = INADDR_ANY;
-        lease->n_ref = REFCNT_INIT;
+        lease->n_ref = 1;
         LIST_HEAD_INIT(lease->private_options);
 
         *ret = lease;
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index 730d95e2c0..e2cd52ac0c 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -73,8 +73,12 @@ bool sd_dhcp_server_is_running(sd_dhcp_server *server) {
 }
 
 sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) {
-        if (server)
-                assert_se(REFCNT_INC(server->n_ref) >= 2);
+
+        if (!server)
+                return NULL;
+
+        assert(server->n_ref >= 1);
+        server->n_ref++;
 
         return server;
 }
@@ -127,7 +131,10 @@ sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) {
         if (!server)
                 return NULL;
 
-        if (REFCNT_DEC(server->n_ref) > 0)
+        assert(server->n_ref >= 1);
+        server->n_ref--;
+
+        if (server->n_ref > 0)
                 return NULL;
 
         log_dhcp_server(server, "UNREF");
@@ -158,7 +165,7 @@ int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) {
         if (!server)
                 return -ENOMEM;
 
-        server->n_ref = REFCNT_INIT;
+        server->n_ref = 1;
         server->fd_raw = -1;
         server->fd = -1;
         server->address = htobe32(INADDR_ANY);
diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c
index 10c3654020..7075a42f43 100644
--- a/src/libsystemd-network/sd-dhcp6-client.c
+++ b/src/libsystemd-network/sd-dhcp6-client.c
@@ -27,7 +27,6 @@
 #include "udev.h"
 #include "udev-util.h"
 #include "util.h"
-#include "refcnt.h"
 #include "random-util.h"
 
 #include "network-internal.h"
@@ -40,7 +39,7 @@
 #define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
 
 struct sd_dhcp6_client {
-        RefCount n_ref;
+        unsigned n_ref;
 
         enum DHCP6State state;
         sd_event *event;
@@ -1222,26 +1221,36 @@ sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) {
 }
 
 sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) {
-        if (client)
-                assert_se(REFCNT_INC(client->n_ref) >= 2);
+
+        if (!client)
+                return NULL;
+
+        assert(client->n_ref >= 1);
+        client->n_ref++;
 
         return client;
 }
 
 sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) {
-        if (client && REFCNT_DEC(client->n_ref) == 0) {
-                client_reset(client);
 
-                sd_dhcp6_client_detach_event(client);
-                sd_dhcp6_lease_unref(client->lease);
+        if (!client)
+                return NULL;
 
-                free(client->req_opts);
-                free(client);
+        assert(client->n_ref >= 1);
+        client->n_ref--;
 
+        if (client->n_ref > 0)
                 return NULL;
-        }
 
-        return client;
+        client_reset(client);
+
+        sd_dhcp6_client_detach_event(client);
+        sd_dhcp6_lease_unref(client->lease);
+
+        free(client->req_opts);
+        free(client);
+
+        return NULL;
 }
 
 int sd_dhcp6_client_new(sd_dhcp6_client **ret)
@@ -1255,7 +1264,7 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret)
         if (!client)
                 return -ENOMEM;
 
-        client->n_ref = REFCNT_INIT;
+        client->n_ref = 1;
 
         client->ia_na.type = DHCP6_OPTION_IA_NA;
 
diff --git a/src/libsystemd-network/sd-dhcp6-lease.c b/src/libsystemd-network/sd-dhcp6-lease.c
index f0494b3c91..cf317408b7 100644
--- a/src/libsystemd-network/sd-dhcp6-lease.c
+++ b/src/libsystemd-network/sd-dhcp6-lease.c
@@ -361,26 +361,38 @@ int sd_dhcp6_lease_get_ntp_fqdn(sd_dhcp6_lease *lease, char ***ntp_fqdn) {
 }
 
 sd_dhcp6_lease *sd_dhcp6_lease_ref(sd_dhcp6_lease *lease) {
-        if (lease)
-                assert_se(REFCNT_INC(lease->n_ref) >= 2);
+
+        if (!lease)
+                return NULL;
+
+        assert(lease->n_ref >= 1);
+        lease->n_ref++;
 
         return lease;
 }
 
 sd_dhcp6_lease *sd_dhcp6_lease_unref(sd_dhcp6_lease *lease) {
-        if (lease && REFCNT_DEC(lease->n_ref) == 0) {
-                free(lease->serverid);
-                dhcp6_lease_free_ia(&lease->ia);
 
-                free(lease->dns);
+        if (!lease)
+                return NULL;
 
-                lease->domains = strv_free(lease->domains);
+        assert(lease->n_ref >= 1);
+        lease->n_ref--;
 
-                free(lease->ntp);
+        if (lease->n_ref > 0)
+                return NULL;
 
-                lease->ntp_fqdn = strv_free(lease->ntp_fqdn);
-                free(lease);
-        }
+        free(lease->serverid);
+        dhcp6_lease_free_ia(&lease->ia);
+
+        free(lease->dns);
+
+        lease->domains = strv_free(lease->domains);
+
+        free(lease->ntp);
+
+        lease->ntp_fqdn = strv_free(lease->ntp_fqdn);
+        free(lease);
 
         return NULL;
 }
@@ -392,7 +404,7 @@ int dhcp6_lease_new(sd_dhcp6_lease **ret) {
         if (!lease)
                 return -ENOMEM;
 
-        lease->n_ref = REFCNT_INIT;
+        lease->n_ref = 1;
 
         LIST_HEAD_INIT(lease->ia.addresses);