From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ursula Braun Subject: [PATCH net 1/5] net/smc: fix non-blocking connect problem Date: Tue, 18 Sep 2018 15:46:34 +0200 Message-ID: <20180918134638.90271-2-ubraun@linux.ibm.com> References: <20180918134638.90271-1-ubraun@linux.ibm.com> Cc: netdev@vger.kernel.org, linux-s390@vger.kernel.org, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, raspl@linux.ibm.com, linux-kernel@vger.kernel.org To: davem@davemloft.net Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45526 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729973AbeIRTT3 (ORCPT ); Tue, 18 Sep 2018 15:19:29 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w8IDedp6092987 for ; Tue, 18 Sep 2018 09:46:48 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2mk14um6jt-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 18 Sep 2018 09:46:47 -0400 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 18 Sep 2018 14:46:46 +0100 In-Reply-To: <20180918134638.90271-1-ubraun@linux.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: In state SMC_INIT smc_poll() delegates polling to the internal CLC socket. This means, once the connect worker has finished its kernel_connect() step, the poll wake-up may occur. This is not intended. The wake-up should occur from the wake up call in smc_connect_work() after __smc_connect() has finished. Thus in state SMC_INIT this patch now calls sock_poll_wait() on the main SMC socket. Signed-off-by: Ursula Braun --- net/smc/af_smc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 2d8a1e15e4f9..9c3976bcde46 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -742,7 +742,10 @@ static void smc_connect_work(struct work_struct *work) smc->sk.sk_err = -rc; out: - smc->sk.sk_state_change(&smc->sk); + if (smc->sk.sk_err) + smc->sk.sk_state_change(&smc->sk); + else + smc->sk.sk_write_space(&smc->sk); kfree(smc->connect_info); smc->connect_info = NULL; release_sock(&smc->sk); @@ -1529,7 +1532,7 @@ static __poll_t smc_poll(struct file *file, struct socket *sock, return EPOLLNVAL; smc = smc_sk(sock->sk); - if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { + if (smc->use_fallback) { /* delegate to CLC child sock */ mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); sk->sk_err = smc->clcsock->sk->sk_err; -- 2.16.4