[PATCH] w1: do not stop and oops if netlink socket was not allocated.

Do not panic if netlink socket was not created.
This will allow only first device to broadcast it's slave updates.
We need kernel connector here.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/w1/w1_int.c

@@ -89,11 +89,8 @@ struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
 	dev->seq = 1;
 	dev->nls = netlink_kernel_create(NETLINK_NFLOG, NULL);
 	if (!dev->nls) {
-		printk(KERN_ERR "Failed to create new netlink socket(%u).\n",
-			NETLINK_NFLOG);
-		memset(dev, 0, sizeof(struct w1_master));
-		kfree(dev);
-		dev = NULL;
+		printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n",
+			NETLINK_NFLOG, dev->dev.bus_id);
 	}
 
 	err = device_register(&dev->dev);
@@ -112,7 +109,7 @@ struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
 void w1_free_dev(struct w1_master *dev)
 {
 	device_unregister(&dev->dev);
-	if (dev->nls->sk_socket)
+	if (dev->nls && dev->nls->sk_socket)
 		sock_release(dev->nls->sk_socket);
 	memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
 	kfree(dev);

drivers/w1/w1_netlink.c

@@ -34,6 +34,9 @@ void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
 	struct w1_netlink_msg *data;
 	struct nlmsghdr *nlh;
 
+	if (!dev->nls)
+		return;
+
 	size = NLMSG_SPACE(sizeof(struct w1_netlink_msg));
 
 	skb = alloc_skb(size, GFP_ATOMIC);