network: do not try to configure address or etc on can device

src/network/networkd-can.c

@@ -69,6 +69,9 @@ static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link)
 
         log_link_debug(link, "Link set");
 
+        link->can_configured = true;
+        link_check_ready(link);
+
         return 1;
 }
 
@@ -269,5 +272,8 @@ int link_configure_can(Link *link) {
                 }
         }
 
+        link->can_configured = true;
+        link_check_ready(link);
+
         return 0;
 }

src/network/networkd-link.c

@@ -764,6 +764,15 @@ void link_check_ready(Link *link) {
         if (!link->network)
                 return;
 
+        if (link->iftype == ARPHRD_CAN) {
+                /* let's shortcut things for CAN which doesn't need most of checks below. */
+                if (!link->can_configured)
+                        return (void) log_link_debug(link, "%s(): CAN device is not configured.", __func__);
+
+                link_enter_configured(link);
+                return;
+        }
+
         if (!link->addresses_configured)
                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 
@@ -2076,6 +2085,7 @@ int link_configure(Link *link) {
                 return r;
 
         if (link->iftype == ARPHRD_CAN)
+                /* let's shortcut things for CAN which doesn't need most of what's done below. */
                 return link_configure_can(link);
 
         r = link_set_sysctl(link);
@@ -2567,6 +2577,10 @@ static int link_carrier_gained(Link *link) {
 
         assert(link);
 
+        if (link->iftype == ARPHRD_CAN)
+                /* let's shortcut things for CAN which doesn't need most of what's done below. */
+                return link_handle_bound_by_list(link);
+
         r = wifi_get_info(link);
         if (r < 0)
                 return r;
@@ -2625,6 +2639,10 @@ static int link_carrier_lost(Link *link) {
         if (link->network && link->network->ignore_carrier_loss)
                 return 0;
 
+        if (link->iftype == ARPHRD_CAN)
+                /* let's shortcut things for CAN which doesn't need most of what's done below. */
+                return link_handle_bound_by_list(link);
+
         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
          * configuration and stop the clients as well. */

src/network/networkd-link.h

@@ -131,6 +131,7 @@ typedef struct Link {
         bool setting_genmode:1;
         bool ipv6_mtu_set:1;
         bool bridge_mdb_configured:1;
+        bool can_configured:1;
         bool activated:1;
 
         sd_dhcp_server *dhcp_server;