[PATCH net-next 01/10] net/smc: serialize connection creation in all cases
From: Ursula Braun <hidden>
Date: 2017-07-28 11:56:13
Also in:
linux-rdma
Subsystem:
networking [general], shared memory communications (smc) sockets, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, D. Wythe, Dust Li, Sidraya Jayagond, Mahanta Jambigi, Linus Torvalds
If a link group for a new server connection exists already, the mutex serializing the determination of link groups is given up early. The coming registration of memory regions benefits from the serialization as well, if the mutex is held till connection creation is finished. This patch postpones the unlocking of the link group creation mutex. Signed-off-by: Ursula Braun <redacted> --- net/smc/af_smc.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 6793d7348cc8..120a7b9b4d8e 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c@@ -779,11 +779,6 @@ static void smc_listen_work(struct work_struct *work) mutex_lock(&smc_create_lgr_pending); local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr, smcibdev, ibport, &pclc.lcl, 0); - if (local_contact == SMC_REUSE_CONTACT) - /* lock no longer needed, free it due to following - * smc_clc_wait_msg() call - */ - mutex_unlock(&smc_create_lgr_pending); if (local_contact < 0) { rc = local_contact; if (rc == -ENOMEM)
@@ -853,8 +848,7 @@ static void smc_listen_work(struct work_struct *work) if (newsmcsk->sk_state == SMC_INIT) newsmcsk->sk_state = SMC_ACTIVE; enqueue: - if (local_contact == SMC_FIRST_CONTACT) - mutex_unlock(&smc_create_lgr_pending); + mutex_unlock(&smc_create_lgr_pending); lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); if (lsmc->sk.sk_state == SMC_LISTEN) { smc_accept_enqueue(&lsmc->sk, newsmcsk);
--
2.11.2
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