Merge "soc: qcom: qmi_interface: Protect sk_user_data with RCU"

#include <linux/string.h>

#include <net/sock.h>

#include <linux/workqueue.h>

#include <linux/rcupdate.h>

#include <linux/soc/qcom/qmi.h>

static struct socket *qmi_sock_create(struct qmi_handle *qmi,

	 * This will be NULL if we receive data while being in

	 * qmi_handle_release()

	 */

	read_lock_bh(&sk->sk_callback_lock);

	qmi = sk->sk_user_data;

	if (!qmi) {

		read_unlock_bh(&sk->sk_callback_lock);

		return;

	}

	rcu_read_lock();

	qmi = rcu_dereference_sk_user_data(sk);

	if (qmi)

		queue_work(qmi->wq, &qmi->work);

	read_unlock_bh(&sk->sk_callback_lock);

	rcu_read_unlock();

}

static struct socket *qmi_sock_create(struct qmi_handle *qmi,

		return ERR_PTR(ret);

	}

	sock->sk->sk_user_data = qmi;

	rcu_assign_sk_user_data(sock->sk, qmi);

	sock->sk->sk_data_ready = qmi_data_ready;

	sock->sk->sk_error_report = qmi_data_ready;

	sock->sk->sk_sndtimeo = HZ * 10;

	mutex_lock(&qmi->sock_lock);

	sock = qmi->sock;

	write_lock_bh(&sock->sk->sk_callback_lock);

	sock->sk->sk_user_data = NULL;

	write_unlock_bh(&sock->sk->sk_callback_lock);

	rcu_assign_sk_user_data(sock->sk, NULL);

	synchronize_rcu();

	sock_release(sock);

	qmi->sock = NULL;

	mutex_unlock(&qmi->sock_lock);