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[5/7] mptcp: avoid lock_fast usage in accept path

Message ID 20210114173654.7618-6-fw@strlen.de
State Superseded, archived
Delegated to: Mat Martineau
Headers show
Series mptcp netlink event support | expand

Commit Message

Florian Westphal Jan. 14, 2021, 5:36 p.m. UTC 
Once event support is added this may need to allocate memory while msk
lock is held with softirqs disabled.

Not using lock_fast also allows to do the allocation with GFP_KERNEL.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 net/mptcp/protocol.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 30986c4008c0..d31f92503abf 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3225,9 +3225,8 @@  static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
 		struct mptcp_sock *msk = mptcp_sk(newsock->sk);
 		struct mptcp_subflow_context *subflow;
 		struct sock *newsk = newsock->sk;
-		bool slowpath;
 
-		slowpath = lock_sock_fast(newsk);
+		lock_sock(newsk);
 
 		/* PM/worker can now acquire the first subflow socket
 		 * lock without racing with listener queue cleanup,
@@ -3253,7 +3252,7 @@  static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
 			if (!ssk->sk_socket)
 				mptcp_sock_graft(ssk, newsock);
 		}
-		unlock_sock_fast(newsk, slowpath);
+		release_sock(newsk);
 	}
 
 	if (inet_csk_listen_poll(ssock->sk))