mptcp: introduce mptcp_schedule_work

remove some of code duplications an allow preventing rescheduling on close. Signed-off-by: Paolo Abeni <pabeni@redhat.com>
multipath-tcp · Oct 24, 2020 · db2c0db · db2c0db
1 parent ec8e220
commit db2c0db
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Showing 3 changed files with 24 additions and 16 deletions.
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
@@ -89,8 +89,7 @@ static bool mptcp_pm_schedule_work(struct mptcp_sock *msk,
 		return false;
 
 	msk->pm.status |= BIT(new_status);
-	if (schedule_work(&msk->work))
-		sock_hold((struct sock *)msk);
+	mptcp_schedule_work((struct sock *)msk);
 	return true;
 }
 

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
@@ -610,9 +610,8 @@ static bool move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk)
 		 * this is not a good place to change state. Let the workqueue
 		 * do it.
 		 */
-		if (mptcp_pending_data_fin(sk, NULL) &&
-		    schedule_work(&msk->work))
-			sock_hold(sk);
+		if (mptcp_pending_data_fin(sk, NULL))
+			mptcp_schedule_work(sk);
 	}
 
 	spin_unlock_bh(&sk->sk_lock.slock);
@@ -689,23 +688,32 @@ static void mptcp_reset_timer(struct sock *sk)
 	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout);
 }
 
+bool mptcp_schedule_work(struct sock *sk)
+{
+	if (inet_sk_state_load(sk) != TCP_CLOSE &&
+	    schedule_work(&mptcp_sk(sk)->work)) {
+		/* each subflow already holds a reference to the sk, and the
+		 * workqueue is invoked by a subflow, so sk can't go away here.
+		 */
+		sock_hold(sk);
+		return true;
+	}
+	return false;
+}
+
 void mptcp_data_acked(struct sock *sk)
 {
 	mptcp_reset_timer(sk);
 
 	if ((!test_bit(MPTCP_SEND_SPACE, &mptcp_sk(sk)->flags) ||
-	     (inet_sk_state_load(sk) != TCP_ESTABLISHED)) &&
-	    schedule_work(&mptcp_sk(sk)->work))
-		sock_hold(sk);
+	     (inet_sk_state_load(sk) != TCP_ESTABLISHED)))
+		mptcp_schedule_work(sk);
 }
 
 void mptcp_subflow_eof(struct sock *sk)
 {
-	struct mptcp_sock *msk = mptcp_sk(sk);
-
-	if (!test_and_set_bit(MPTCP_WORK_EOF, &msk->flags) &&
-	    schedule_work(&msk->work))
-		sock_hold(sk);
+	if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags))
+		mptcp_schedule_work(sk);
 }
 
 static void mptcp_check_for_eof(struct mptcp_sock *msk)
@@ -1610,8 +1618,7 @@ static void mptcp_retransmit_handler(struct sock *sk)
 		mptcp_stop_timer(sk);
 	} else {
 		set_bit(MPTCP_WORK_RTX, &msk->flags);
-		if (schedule_work(&msk->work))
-			sock_hold(sk);
+		mptcp_schedule_work(sk);
 	}
 }
 
@@ -2324,7 +2331,8 @@ static void mptcp_release_cb(struct sock *sk)
 		struct sock *ssk;
 
 		ssk = mptcp_subflow_recv_lookup(msk);
-		if (!ssk || !schedule_work(&msk->work))
+		if (!ssk || sk->sk_state == TCP_CLOSE ||
+		    !schedule_work(&msk->work))
 			__sock_put(sk);
 	}
 

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
@@ -408,6 +408,7 @@ static inline bool mptcp_is_fully_established(struct sock *sk)
 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
 bool mptcp_finish_join(struct sock *sk);
+bool mptcp_schedule_work(struct sock *sk);
 void mptcp_data_acked(struct sock *sk);
 void mptcp_subflow_eof(struct sock *sk);
 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);