Subject: [PATCH] nethost:  Make put_host safe in interrupt context
From: Eric W. Biederman <ebiederman@lnxi.com>
Date: 1133990024 -0700

Since the network code via sk_free calls put_host
in a interrupt context.  Use schedule_work to put
us back in process context where the nethost structure
can be safely freed.

---

 include/linux/nethost.h |    2 ++
 net/core/host.c         |   11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)

160c8403ebdb4b1ec4c10dffb154e383c4da8026
diff --git a/include/linux/nethost.h b/include/linux/nethost.h
index 1c55185..0cd135d 100644
--- a/include/linux/nethost.h
+++ b/include/linux/nethost.h
@@ -6,12 +6,14 @@
 #include <linux/sched.h>
 #include <linux/utsname.h>
 #include <linux/netdevice.h>
+#include <linux/workqueue.h>
 
 struct nethost {
 	atomic_t count;
 	struct new_utsname utsname;
 #ifdef CONFIG_NET
 	struct net_device loopback_dev;
+	struct work_struct work;
 #endif
 };
 
diff --git a/net/core/host.c b/net/core/host.c
index c275a27..9c8c62d 100644
--- a/net/core/host.c
+++ b/net/core/host.c
@@ -2,14 +2,23 @@
 #include <linux/nethost.h>
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
+#include <linux/workqueue.h>
 #include <net/sock.h>
 
-void __put_host(struct nethost *host)
+static void do_put_host(void *arg)
 {
+	struct nethost *host = arg;
 	loopback_free(&host->loopback_dev);
 	kfree(host);
 }
 
+void __put_host(struct nethost *host)
+{
+	/* Cleanup the host structure in process context */
+	INIT_WORK(&host->work, do_put_host, host);
+	schedule_work(&host->work);
+}
+
 int __copy_host(int flags, struct task_struct *p)
 {
 	struct net_device *dev;
-- 
1.0.GIT