firewire: net: fix card driver reloading

Fix some problems from "firewire: net: allow for unordered unit
discovery":
  - fwnet_remove was missing a list_del, causing fwnet_probe to crash if
    called after fwnet_remove, e.g. if firewire-ohci was unloaded and
    reloaded.
  - fwnet_probe should set its new_netdev flag only if it actually
    allocated a net_device.
  - Use dev_set_drvdata and dev_get_drvdata instead of deprecated direct
    access to device.driver_data.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index 95e35a3..47dcb45 100644 (file)
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -1390,7 +1390,8 @@ static int fwnet_add_peer(struct fwnet_device *dev,
        if (!peer)
                return -ENOMEM;
 
-       unit->device.driver_data = peer;
+       dev_set_drvdata(&unit->device, peer);
+
        peer->dev = dev;
        peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
        peer->fifo = FWNET_NO_FIFO_ADDR;
@@ -1417,27 +1418,26 @@ static int fwnet_probe(struct device *_dev)
        struct fw_device *device = fw_parent_device(unit);
        struct fw_card *card = device->card;
        struct net_device *net;
+       bool allocated_netdev = false;
        struct fwnet_device *dev;
        unsigned max_mtu;
-       bool new_netdev;
        int ret;
 
        mutex_lock(&fwnet_device_mutex);
 
        dev = fwnet_dev_find(card);
        if (dev) {
-               new_netdev = false;
                net = dev->netdev;
                goto have_dev;
        }
 
-       new_netdev = true;
        net = alloc_netdev(sizeof(*dev), "firewire%d", fwnet_init_dev);
        if (net == NULL) {
                ret = -ENOMEM;
                goto out;
        }
 
+       allocated_netdev = true;
        SET_NETDEV_DEV(net, card->device);
        dev = netdev_priv(net);
 
@@ -1479,12 +1479,12 @@ static int fwnet_probe(struct device *_dev)
                  net->name, (unsigned long long)card->guid);
  have_dev:
        ret = fwnet_add_peer(dev, unit, device);
-       if (ret && new_netdev) {
+       if (ret && allocated_netdev) {
                unregister_netdev(net);
                list_del(&dev->dev_link);
        }
  out:
-       if (ret && new_netdev)
+       if (ret && allocated_netdev)
                free_netdev(net);
 
        mutex_unlock(&fwnet_device_mutex);
@@ -1508,7 +1508,7 @@ static void fwnet_remove_peer(struct fwnet_peer *peer)
 
 static int fwnet_remove(struct device *_dev)
 {
-       struct fwnet_peer *peer = _dev->driver_data;
+       struct fwnet_peer *peer = dev_get_drvdata(_dev);
        struct fwnet_device *dev = peer->dev;
        struct net_device *net;
        struct fwnet_packet_task *ptask, *pt_next;
@@ -1544,6 +1544,8 @@ static int fwnet_remove(struct device *_dev)
                        dev_kfree_skb_any(ptask->skb);
                        kmem_cache_free(fwnet_packet_task_cache, ptask);
                }
+               list_del(&dev->dev_link);
+
                free_netdev(net);
        }
 
@@ -1559,7 +1561,7 @@ static int fwnet_remove(struct device *_dev)
 static void fwnet_update(struct fw_unit *unit)
 {
        struct fw_device *device = fw_parent_device(unit);
-       struct fwnet_peer *peer = unit->device.driver_data;
+       struct fwnet_peer *peer = dev_get_drvdata(&unit->device);
        int generation;
 
        generation = device->generation;