netdev - [PATCH net-next 01/10] mptcp: drop WORKER

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Date:   Thu, 19 Nov 2020 11:45:54 -0800
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Paolo Abeni <pabeni@...hat.com>, kuba@...nel.org,
        mptcp@...ts.01.org, Matthieu Baerts <matthieu.baerts@...sares.net>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 01/10] mptcp: drop WORKER_RUNNING status bit

From: Paolo Abeni <pabeni@...hat.com>

Only mptcp_close() can actually cancel the workqueue,
no need to add and use this flag.

Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/protocol.c | 8 +-------
 net/mptcp/protocol.h | 1 -
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 8df013daea88..749c00fffff5 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1861,7 +1861,6 @@ static void mptcp_worker(struct work_struct *work)
 	int state, ret;
 
 	lock_sock(sk);
-	set_bit(MPTCP_WORKER_RUNNING, &msk->flags);
 	state = sk->sk_state;
 	if (unlikely(state == TCP_CLOSE))
 		goto unlock;
@@ -1939,7 +1938,6 @@ static void mptcp_worker(struct work_struct *work)
 		mptcp_reset_timer(sk);
 
 unlock:
-	clear_bit(MPTCP_WORKER_RUNNING, &msk->flags);
 	release_sock(sk);
 	sock_put(sk);
 }
@@ -2010,11 +2008,7 @@ static void mptcp_cancel_work(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 
-	/* if called by the work itself, do not try to cancel the work, or
-	 * we will hang.
-	 */
-	if (!test_bit(MPTCP_WORKER_RUNNING, &msk->flags) &&
-	    cancel_work_sync(&msk->work))
+	if (cancel_work_sync(&msk->work))
 		__sock_put(sk);
 }
 
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index b4c8dbe9236b..10fffc5de9e4 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -91,7 +91,6 @@
 #define MPTCP_WORK_EOF		3
 #define MPTCP_FALLBACK_DONE	4
 #define MPTCP_WORK_CLOSE_SUBFLOW 5
-#define MPTCP_WORKER_RUNNING	6
 
 static inline bool before64(__u64 seq1, __u64 seq2)
 {
-- 
2.29.2