Bluetooth: hidp: fix possible might sleep error in hidp_session_thread

It looks like hidp_session_thread has same pattern as the issue reported in
old rfcomm:

	while (1) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (condition)
			break;
		// may call might_sleep here
		schedule();
	}
	__set_current_state(TASK_RUNNING);

Which fixed at:
	dfb2fae Bluetooth: Fix nested sleeps

So let's fix it at the same way, also follow the suggestion of:
https://lwn.net/Articles/628628/

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Tested-by: AL Yu-Chen Cho <acho@suse.com>
Tested-by: Rohit Vaswani <rvaswani@nvidia.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 961f7f53e178206a3c793c5db42e3b24ad240582..472b3907b1b0f271d5abc3e13fcd0d4d6c59d15a 100644 (file)
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -36,6 +36,7 @@
 #define VERSION "1.2"
 
 static DECLARE_RWSEM(hidp_session_sem);
+static DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq);
 static LIST_HEAD(hidp_session_list);
 
 static unsigned char hidp_keycode[256] = {
@@ -1068,12 +1069,12 @@ static int hidp_session_start_sync(struct hidp_session *session)
  * Wake up session thread and notify it to stop. This is asynchronous and
  * returns immediately. Call this whenever a runtime error occurs and you want
  * the session to stop.
- * Note: wake_up_process() performs any necessary memory-barriers for us.
+ * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
  */
 static void hidp_session_terminate(struct hidp_session *session)
 {
        atomic_inc(&session->terminate);
-       wake_up_process(session->task);
+       wake_up_interruptible(&hidp_session_wq);
 }
 
 /*
@@ -1180,7 +1181,9 @@ static void hidp_session_run(struct hidp_session *session)
        struct sock *ctrl_sk = session->ctrl_sock->sk;
        struct sock *intr_sk = session->intr_sock->sk;
        struct sk_buff *skb;
+       DEFINE_WAIT_FUNC(wait, woken_wake_function);
 
+       add_wait_queue(&hidp_session_wq, &wait);
        for (;;) {
                /*
                 * This thread can be woken up two ways:
@@ -1188,12 +1191,10 @@ static void hidp_session_run(struct hidp_session *session)
                 *    session->terminate flag and wakes this thread up.
                 *  - Via modifying the socket state of ctrl/intr_sock. This
                 *    thread is woken up by ->sk_state_changed().
-                *
-                * Note: set_current_state() performs any necessary
-                * memory-barriers for us.
                 */
-               set_current_state(TASK_INTERRUPTIBLE);
 
+               /* Ensure session->terminate is updated */
+               smp_mb__before_atomic();
                if (atomic_read(&session->terminate))
                        break;
 
@@ -1227,11 +1228,22 @@ static void hidp_session_run(struct hidp_session *session)
                hidp_process_transmit(session, &session->ctrl_transmit,
                                      session->ctrl_sock);
 
-               schedule();
+               wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
        }
+       remove_wait_queue(&hidp_session_wq, &wait);
 
        atomic_inc(&session->terminate);
-       set_current_state(TASK_RUNNING);
+
+       /* Ensure session->terminate is updated */
+       smp_mb__after_atomic();
+}
+
+static int hidp_session_wake_function(wait_queue_t *wait,
+                                     unsigned int mode,
+                                     int sync, void *key)
+{
+       wake_up_interruptible(&hidp_session_wq);
+       return false;
 }
 
 /*
@@ -1244,7 +1256,8 @@ static void hidp_session_run(struct hidp_session *session)
 static int hidp_session_thread(void *arg)
 {
        struct hidp_session *session = arg;
-       wait_queue_t ctrl_wait, intr_wait;
+       DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
+       DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
 
        BT_DBG("session %p", session);
 
@@ -1254,8 +1267,6 @@ static int hidp_session_thread(void *arg)
        set_user_nice(current, -15);
        hidp_set_timer(session);
 
-       init_waitqueue_entry(&ctrl_wait, current);
-       init_waitqueue_entry(&intr_wait, current);
        add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
        add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
        /* This memory barrier is paired with wq_has_sleeper(). See