1 files changed, 39 insertions, 7 deletions

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 4c51714ee741..baa6af9500df 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -761,31 +761,63 @@ static struct genl_ops nfc_genl_ops[] = {
         },
 };
 
-static int nfc_genl_rcv_nl_event(struct notifier_block *this,
-                                 unsigned long event, void *ptr)
+
+struct urelease_work {
+        struct  work_struct w;
+        int     pid;
+};
+
+static void nfc_urelease_event_work(struct work_struct *work)
 {
-        struct netlink_notify *n = ptr;
+        struct urelease_work *w = container_of(work, struct urelease_work, w);
         struct class_dev_iter iter;
         struct nfc_dev *dev;
 
-        if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
-                goto out;
+        pr_debug("pid %d\n", w->pid);
 
-        pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
+        mutex_lock(&nfc_devlist_mutex);
 
         nfc_device_iter_init(&iter);
         dev = nfc_device_iter_next(&iter);
 
         while (dev) {
-                if (dev->genl_data.poll_req_pid == n->pid) {
+                mutex_lock(&dev->genl_data.genl_data_mutex);
+
+                if (dev->genl_data.poll_req_pid == w->pid) {
                         nfc_stop_poll(dev);
                         dev->genl_data.poll_req_pid = 0;
                 }
+
+                mutex_unlock(&dev->genl_data.genl_data_mutex);
+
                 dev = nfc_device_iter_next(&iter);
         }
 
         nfc_device_iter_exit(&iter);
 
+        mutex_unlock(&nfc_devlist_mutex);
+
+        kfree(w);
+}
+
+static int nfc_genl_rcv_nl_event(struct notifier_block *this,
+                                 unsigned long event, void *ptr)
+{
+        struct netlink_notify *n = ptr;
+        struct urelease_work *w;
+
+        if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
+                goto out;
+
+        pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
+
+        w = kmalloc(sizeof(*w), GFP_ATOMIC);
+        if (w) {
+                INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
+                w->pid = n->pid;
+                schedule_work((struct work_struct *) w);
+        }
+
 out:
         return NOTIFY_DONE;
 }