[Suspend2][ 10/13] [Suspend2] Prepare/cleanup netlink connections.

[Nigel Cunningham <nigel@suspend2.net>]

Prepare to communicate with a userspace helper over a netlink socket and
cleanup afterwards.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/netlink.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/kernel/power/netlink.c b/kernel/power/netlink.c
index c5b4bea..7b75f4f 100644
--- a/kernel/power/netlink.c
+++ b/kernel/power/netlink.c
@@ -257,3 +257,36 @@ static void suspend_netlink_input(struct
 	} while (uhd->nl && uhd->nl->sk_receive_queue.qlen);
 }
 
+static int netlink_prepare(struct user_helper_data *uhd)
+{
+	uhd->next = uhd_list;
+	uhd_list = uhd;
+
+	uhd->sock_seq = 0x42c0ffee;
+	uhd->nl = netlink_kernel_create(uhd->netlink_id, 0,
+			suspend_netlink_input, THIS_MODULE);
+	if (!uhd->nl) {
+		printk("Failed to allocate netlink socket for %s.\n",
+				uhd->name);
+		return -ENOMEM;
+	}
+
+	suspend_fill_skb_pool(uhd);
+
+	return 0;
+}
+
+void suspend_netlink_close(struct user_helper_data *uhd)
+{
+	if (uhd->nl) {
+		sock_release(uhd->nl->sk_socket);
+		uhd->nl = NULL;
+	}
+
+	while (uhd->emerg_skbs) {
+		struct sk_buff *next = uhd->emerg_skbs->next;
+		kfree_skb(uhd->emerg_skbs);
+		uhd->emerg_skbs = next;
+	}
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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