From patchwork Fri Nov 22 07:16:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 13882815 Received: from out30-112.freemail.mail.aliyun.com (out30-112.freemail.mail.aliyun.com [115.124.30.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E49CD230987; Fri, 22 Nov 2024 07:22:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.112 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732260129; cv=none; b=BYIHfQ4ZlGX0N9Gi8sOcgabnxwJ8tMd7AG3z/RmOZaj7mi2Mn0fCNOogrwxssxU0Ij5/SeLXXffRQ0HNMlY6zeTwLD6EeILXWI8zE4GBuIY1UHstJt9LxDkMkONPfBA7QF4JJ6W6u8WCJwVJDe4LyeM1p0+tHwLTnZWmAeHdzSI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732260129; c=relaxed/simple; bh=krLSltSvxa1b5p+97f+phk+FYHKalBzUK+6b+JMRYx4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kcN030gTVI2cPS6fur6JS9GD9paSRxsZRPw8omvw/0R+O08iLCMkt1IdP3zNVNfj17aB6bq7EnPSR2q5YK5gllq8qvVbuEI6CNSUzwL52gIJgZ250Yco5ef5IIc22YwBC0GbVCCueLzUznHrzauVF5c0M34lea2asXaDZ7Wzo5g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=HX7iYiBI; arc=none smtp.client-ip=115.124.30.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="HX7iYiBI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1732260117; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=gaDcST95Gx4iPn815neB9XkKhGEorlv6Hxro/QIQDq0=; b=HX7iYiBIv7GZGTDu2uM6KVaanHFL/1sCyAzBlwm/f8ThZXPUHENQTzwR+La72dgpDRb4q14vZ3uNd9vR9SuvVLPUe5IExZaMeKA69YmomsOEYH42rBgaK7ZP69gaqapZcPASZVajO7wlwfR09NF3kvmY88oSoPx+fK2Bd2N577Q= Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0WJzio16_1732259792 cluster:ay36) by smtp.aliyun-inc.com; Fri, 22 Nov 2024 15:16:34 +0800 From: Wen Gu To: wenjia@linux.ibm.com, jaka@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, horms@kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 1/2] net/smc: initialize close_work early to avoid warning Date: Fri, 22 Nov 2024 15:16:29 +0800 Message-Id: <20241122071630.63707-2-guwen@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20241122071630.63707-1-guwen@linux.alibaba.com> References: <20241122071630.63707-1-guwen@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We encountered a warning that close_work was canceled before initialization. WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0 Workqueue: events smc_lgr_terminate_work [smc] RIP: 0010:__flush_work+0x19e/0x1b0 Call Trace: ? __wake_up_common+0x7a/0x190 ? work_busy+0x80/0x80 __cancel_work_timer+0xe3/0x160 smc_close_cancel_work+0x1a/0x70 [smc] smc_close_active_abort+0x207/0x360 [smc] __smc_lgr_terminate.part.38+0xc8/0x180 [smc] process_one_work+0x19e/0x340 worker_thread+0x30/0x370 ? process_one_work+0x340/0x340 kthread+0x117/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x22/0x30 This is because when smc_close_cancel_work is triggered, e.g. the RDMA driver is rmmod and the LGR is terminated, the conn->close_work is flushed before initialization, resulting in WARN_ON(!work->func). __smc_lgr_terminate | smc_connect_{rdma|ism} ------------------------------------------------------------- | smc_conn_create | \- smc_lgr_register_conn for conn in lgr->conns_all | \- smc_conn_kill | \- smc_close_active_abort | \- smc_close_cancel_work | \- cancel_work_sync | \- __flush_work | (close_work) | | smc_close_init | \- INIT_WORK(&close_work) So fix this by initializing close_work before establishing the connection. Fixes: 46c28dbd4c23 ("net/smc: no socket state changes in tasklet context") Fixes: 413498440e30 ("net/smc: add SMC-D support in af_smc") Signed-off-by: Wen Gu Reviewed-by: Wenjia Zhang Reviewed-by: Alexandra Winter --- net/smc/af_smc.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 9d76e902fd77..ed6d4d520bc7 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -383,6 +383,7 @@ void smc_sk_init(struct net *net, struct sock *sk, int protocol) smc->limit_smc_hs = net->smc.limit_smc_hs; smc->use_fallback = false; /* assume rdma capability first */ smc->fallback_rsn = 0; + smc_close_init(smc); } static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, @@ -1299,7 +1300,6 @@ static int smc_connect_rdma(struct smc_sock *smc, goto connect_abort; } - smc_close_init(smc); smc_rx_init(smc); if (ini->first_contact_local) { @@ -1435,7 +1435,6 @@ static int smc_connect_ism(struct smc_sock *smc, goto connect_abort; } } - smc_close_init(smc); smc_rx_init(smc); smc_tx_init(smc); @@ -2479,7 +2478,6 @@ static void smc_listen_work(struct work_struct *work) goto out_decl; mutex_lock(&smc_server_lgr_pending); - smc_close_init(new_smc); smc_rx_init(new_smc); smc_tx_init(new_smc);