diff options
| -rw-r--r-- | net/nfc/netlink.c | 46 |
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; } |