From 62252cba2867cec7cc484ebb2d3ec705c41d9684 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 26 Jan 2012 14:04:53 +0000 Subject: net caif: Register properly as a pernet subsystem. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ 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 Acked-by: Sjur Brændeland Tested-by: Sasha Levin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/caif/caif_dev.c | 11 ++++------- net/caif/cfcnfg.c | 1 - 2 files changed, 4 insertions(+), 8 deletions(-) (limited to 'net/caif') diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c index dbdaa95b800..5ba4366a220 100644 --- 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 52fe33bee02..bca32d7c15c 100644 --- 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, ¶m); -- cgit v1.2.3