net caif: Register properly as a pernet subsystem.

[ Upstream commit 8a8ee9aff6c3077dd9c2c7a77478e8ed362b96c6 ]

caif is a subsystem and as such it needs to register with
register_pernet_subsys instead of register_pernet_device.

Among other problems using register_pernet_device was resulting in
net_generic being called before the caif_net structure was allocated.
Which has been causing net_generic to fail with either BUG_ON's or by
return NULL pointers.

A more ugly problem that could be caused is packets in flight why the
subsystem is shutting down.

To remove confusion also remove the cruft cause by inappropriately
trying to fix this bug.

With the aid of the previous patch I have tested this patch and
confirmed that using register_pernet_subsys makes the failure go away as
it should.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c
index dbdaa95b80055fc0a2cb9d03d1e5aee9c66f4596..5ba4366a220d0c1b4047d13e7bd00e3edab2dae3 100644 (file)
--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -53,7 +53,6 @@ struct cfcnfg *get_cfcnfg(struct net *net)
        struct caif_net *caifn;
        BUG_ON(!net);
        caifn = net_generic(net, caif_net_id);
-       BUG_ON(!caifn);
        return caifn->cfg;
 }
 EXPORT_SYMBOL(get_cfcnfg);
@@ -63,7 +62,6 @@ static struct caif_device_entry_list *caif_device_list(struct net *net)
        struct caif_net *caifn;
        BUG_ON(!net);
        caifn = net_generic(net, caif_net_id);
-       BUG_ON(!caifn);
        return &caifn->caifdevs;
 }
 
@@ -92,7 +90,6 @@ static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
        struct caif_device_entry *caifd;
 
        caifdevs = caif_device_list(dev_net(dev));
-       BUG_ON(!caifdevs);
 
        caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
        if (!caifd)
@@ -108,7 +105,7 @@ static struct caif_device_entry *caif_get(struct net_device *dev)
        struct caif_device_entry_list *caifdevs =
            caif_device_list(dev_net(dev));
        struct caif_device_entry *caifd;
-       BUG_ON(!caifdevs);
+
        list_for_each_entry_rcu(caifd, &caifdevs->list, list) {
                if (caifd->netdev == dev)
                        return caifd;
@@ -349,7 +346,7 @@ static struct notifier_block caif_device_notifier = {
 static int caif_init_net(struct net *net)
 {
        struct caif_net *caifn = net_generic(net, caif_net_id);
-       BUG_ON(!caifn);
+
        INIT_LIST_HEAD(&caifn->caifdevs.list);
        mutex_init(&caifn->caifdevs.lock);
 
@@ -414,7 +411,7 @@ static int __init caif_device_init(void)
 {
        int result;
 
-       result = register_pernet_device(&caif_net_ops);
+       result = register_pernet_subsys(&caif_net_ops);
 
        if (result)
                return result;
@@ -427,7 +424,7 @@ static int __init caif_device_init(void)
 
 static void __exit caif_device_exit(void)
 {
-       unregister_pernet_device(&caif_net_ops);
+       unregister_pernet_subsys(&caif_net_ops);
        unregister_netdevice_notifier(&caif_device_notifier);
        dev_remove_pack(&caif_packet_type);
 }

diff --git a/net/caif/cfcnfg.c b/net/caif/cfcnfg.c
index 52fe33bee0298a8eac119faf3dbe07be0b0ebbea..bca32d7c15c952619ce764be2250789003877f1a 100644 (file)
--- a/net/caif/cfcnfg.c
+++ b/net/caif/cfcnfg.c
@@ -313,7 +313,6 @@ int caif_connect_client(struct net *net, struct caif_connect_request *conn_req,
        int err;
        struct cfctrl_link_param param;
        struct cfcnfg *cfg = get_cfcnfg(net);
-       caif_assert(cfg != NULL);
 
        rcu_read_lock();
        err = caif_connect_req_to_link_param(cfg, conn_req, &param);