From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B707DC433DF for ; Thu, 28 May 2020 12:07:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 97B1E215A4 for ; Thu, 28 May 2020 12:07:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590667650; bh=wRtU7PCfTBmPc8X0k2+ZdEGfMk5/kYEWd3d3rEus7J4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eoABcq6SfidgBK3jNmexVE7KLaAgmaLA8QFVPAAiNx7X7mCghUsgPHciTosH9/8S9 sNck481eBMheQBRem66OOuuH6t/iEvwXIneg+9JsJRvdGgEap+5oQL+m53Ghp2Rek6 IRCs9H0Kt+tihOVkQsjyb+T62PZdw95DCDiqmK1c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389589AbgE1MH3 (ORCPT ); Thu, 28 May 2020 08:07:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:48674 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388799AbgE1L4n (ORCPT ); Thu, 28 May 2020 07:56:43 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 97E4821475; Thu, 28 May 2020 11:56:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590667002; bh=wRtU7PCfTBmPc8X0k2+ZdEGfMk5/kYEWd3d3rEus7J4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wE3hWAnKkgzwTHCxmDug7MdKaFthM+I02PdPPVO05FKXfiydzloOYTHPA6NEdhObv +lJxbByBM/QjoshkaESx1Tn6tFT39qx1FRJ79oqi2fSwgVfXqugomuwsS2Ewv3jpA0 OnM8Iuv+1GywC3KZIiHRHRdN4qCYyEEUYYrwnxwg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Moshe Shemesh , Eran Ben Elisha , Saeed Mahameed , Sasha Levin , netdev@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH AUTOSEL 5.6 37/47] net/mlx5: Add command entry handling completion Date: Thu, 28 May 2020 07:55:50 -0400 Message-Id: <20200528115600.1405808-37-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200528115600.1405808-1-sashal@kernel.org> References: <20200528115600.1405808-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Moshe Shemesh [ Upstream commit 17d00e839d3b592da9659c1977d45f85b77f986a ] When FW response to commands is very slow and all command entries in use are waiting for completion we can have a race where commands can get timeout before they get out of the queue and handled. Timeout completion on uninitialized command will cause releasing command's buffers before accessing it for initialization and then we will get NULL pointer exception while trying access it. It may also cause releasing buffers of another command since we may have timeout completion before even allocating entry index for this command. Add entry handling completion to avoid this race. Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters") Signed-off-by: Moshe Shemesh Signed-off-by: Eran Ben Elisha Signed-off-by: Saeed Mahameed Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 14 ++++++++++++++ include/linux/mlx5/driver.h | 1 + 2 files changed, 15 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c index cede5bdfd598..d695b75bc0af 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c @@ -861,6 +861,7 @@ static void cmd_work_handler(struct work_struct *work) int alloc_ret; int cmd_mode; + complete(&ent->handling); sem = ent->page_queue ? &cmd->pages_sem : &cmd->sem; down(sem); if (!ent->page_queue) { @@ -978,6 +979,11 @@ static int wait_func(struct mlx5_core_dev *dev, struct mlx5_cmd_work_ent *ent) struct mlx5_cmd *cmd = &dev->cmd; int err; + if (!wait_for_completion_timeout(&ent->handling, timeout) && + cancel_work_sync(&ent->work)) { + ent->ret = -ECANCELED; + goto out_err; + } if (cmd->mode == CMD_MODE_POLLING || ent->polling) { wait_for_completion(&ent->done); } else if (!wait_for_completion_timeout(&ent->done, timeout)) { @@ -985,12 +991,17 @@ static int wait_func(struct mlx5_core_dev *dev, struct mlx5_cmd_work_ent *ent) mlx5_cmd_comp_handler(dev, 1UL << ent->idx, true); } +out_err: err = ent->ret; if (err == -ETIMEDOUT) { mlx5_core_warn(dev, "%s(0x%x) timeout. Will cause a leak of a command resource\n", mlx5_command_str(msg_to_opcode(ent->in)), msg_to_opcode(ent->in)); + } else if (err == -ECANCELED) { + mlx5_core_warn(dev, "%s(0x%x) canceled on out of queue timeout.\n", + mlx5_command_str(msg_to_opcode(ent->in)), + msg_to_opcode(ent->in)); } mlx5_core_dbg(dev, "err %d, delivery status %s(%d)\n", err, deliv_status_to_str(ent->status), ent->status); @@ -1026,6 +1037,7 @@ static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in, ent->token = token; ent->polling = force_polling; + init_completion(&ent->handling); if (!callback) init_completion(&ent->done); @@ -1045,6 +1057,8 @@ static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in, err = wait_func(dev, ent); if (err == -ETIMEDOUT) goto out; + if (err == -ECANCELED) + goto out_free; ds = ent->ts2 - ent->ts1; op = MLX5_GET(mbox_in, in->first.data, opcode); diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h index 277a51d3ec40..b596353a3a12 100644 --- a/include/linux/mlx5/driver.h +++ b/include/linux/mlx5/driver.h @@ -761,6 +761,7 @@ struct mlx5_cmd_work_ent { struct delayed_work cb_timeout_work; void *context; int idx; + struct completion handling; struct completion done; struct mlx5_cmd *cmd; struct work_struct work; -- 2.25.1