Patch "net caif: Register properly as a pernet subsystem." has been added to the 3.2-stable tree

Patch "net caif: Register properly as a pernet subsystem." has been added to the 3.2-stable tree

[gregkh]

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This is a note to let you know that I've just added the patch titled

    net caif: Register properly as a pernet subsystem.

to the 3.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-caif-register-properly-as-a-pernet-subsystem.patch
and it can be found in the queue-3.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 42f7400894971bf3e6fc47898a6040a8d414ef16 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Thu, 26 Jan 2012 14:04:53 +0000
Subject: net caif: Register properly as a pernet subsystem.


From: "Eric W. Biederman" <ebiederm@xmission.com>

[ 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 Br�ndeland <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@suse.de>
---
 net/caif/caif_dev.c |   11 ++++-------
 net/caif/cfcnfg.c   |    1 -
 2 files changed, 4 insertions(+), 8 deletions(-)

--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -53,7 +53,6 @@ struct cfcnfg *get_cfcnfg(struct net *ne
 	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 *ca
 	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_de
 	struct caif_device_entry *caifd;
 
 	caifdevs = caif_device_list(dev_net(dev));
-	BUG_ON(!caifdevs);
 
 	caifd = kzalloc(sizeof(*caifd), GFP_KERNEL);
 	if (!caifd)
@@ -112,7 +109,7 @@ static struct caif_device_entry *caif_ge
 	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;
@@ -353,7 +350,7 @@ static struct notifier_block caif_device
 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);
 
@@ -418,7 +415,7 @@ 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;
@@ -431,7 +428,7 @@ 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);
 }
--- a/net/caif/cfcnfg.c
+++ b/net/caif/cfcnfg.c
@@ -309,7 +309,6 @@ int caif_connect_client(struct net *net,
 	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);


Patches currently in stable-queue which might be from ebiederm@xmission.com are

queue-3.2/sysfs-complain-bitterly-about-attempts-to-remove-files-from-nonexistent-directories.patch
queue-3.2/usb-io_ti-make-edge_remove_sysfs_attrs-the-port_remove-method.patch
queue-3.2/net-caif-register-properly-as-a-pernet-subsystem.patch
queue-3.2/netns-fix-net_alloc_generic.patch
queue-3.2/netns-fail-conspicously-if-someone-uses-net_generic-at-an-inappropriate-time.patch