Use hotplug support to notify persistent reference holders when a

net_device is unregistered.

diff --git a/src/include/gpxe/netdevice.h b/src/include/gpxe/netdevice.h
index b7ec83d961eb08f6f20fdd53894fb35f9de24ae4..7551be74d7c052470c949400f218091015e608a3 100644 (file)
--- a/src/include/gpxe/netdevice.h
+++ b/src/include/gpxe/netdevice.h
@@ -10,6 +10,7 @@
 #include <stdint.h>
 #include <gpxe/list.h>
 #include <gpxe/tables.h>
+#include <gpxe/hotplug.h>
 
 struct pk_buff;
 struct net_device;
@@ -137,6 +138,10 @@ struct ll_protocol {
 struct net_device {
        /** List of network devices */
        struct list_head list;
+
+       /** List of persistent reference holders */
+       struct list_head references;
+
        /** Transmit packet
         *
         * @v netdev    Network device

diff --git a/src/net/netdevice.c b/src/net/netdevice.c
index 3f8e54bb12190c7b6f6fc3797d7060492c69b4fa..3949d26de31ef4f5e18c12020c4c932eceb3f248 100644 (file)
--- a/src/net/netdevice.c
+++ b/src/net/netdevice.c
@@ -161,6 +161,7 @@ struct net_device * alloc_netdev ( size_t priv_size ) {
 
        netdev = calloc ( 1, sizeof ( *netdev ) + priv_size );
        if ( netdev ) {
+               INIT_LIST_HEAD ( &netdev->references );
                INIT_LIST_HEAD ( &netdev->rx_queue );
                netdev->priv = ( ( ( void * ) netdev ) + sizeof ( *netdev ) );
        }
@@ -201,6 +202,9 @@ void unregister_netdev ( struct net_device *netdev ) {
                free_pkb ( pkb );
        }
 
+       /* Kill off any persistent references to this device */
+       forget_references ( &netdev->references );
+
        /* Remove from device list */
        list_del ( &netdev->list );
        DBG ( "%s unregistered\n", netdev_name ( netdev ) );