From patchwork Mon Nov 4 07:41:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 11225135 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3BDDA15AB for ; Mon, 4 Nov 2019 07:41:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1B5882190F for ; Mon, 4 Nov 2019 07:41:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572853306; bh=1u/OmclZYDmCL/AXUhElWHqwCkMQxKEiOIdFGBzeeaM=; h=Date:From:To:Cc:Subject:List-ID:From; b=SKg/T9JXTQc5IQmBgGU/aFWmCKCrOslvp2km6iC2oudBM+FlSAFbTX5hvKzmF6bwc Tp+54T/El/2eDcYYZAVWH7HiNzTdAR8+WHF9qkn9k+Fmom4Ov/aNPBlGV7hZO3AhJY f2RsaG4nbAN0BqFlyX4hNlx/xxsxQKJ1gwsh9qHA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727267AbfKDHlp (ORCPT ); Mon, 4 Nov 2019 02:41:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:53732 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726891AbfKDHlp (ORCPT ); Mon, 4 Nov 2019 02:41:45 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9CA07205C9; Mon, 4 Nov 2019 07:41:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572853304; bh=1u/OmclZYDmCL/AXUhElWHqwCkMQxKEiOIdFGBzeeaM=; h=Date:From:To:Cc:Subject:From; b=OGQ+HXc1XPAbXxyNoKzd3t8Id1dsgnwG4/s8qCIqz2DpPfXlfxPmP02VxzFg3/OOw bweVXGzlnMwBmVeHmw/AAGjrngRMmITJM/ojpcxROENeysxLN041pW9RXjgZyJGCud D3S35LviwwS/UO+6MerPdqN4ZPSIBUUcQ9FyZuUc= Date: Mon, 4 Nov 2019 08:41:41 +0100 From: Greg Kroah-Hartman To: Leon Romanovsky , Doug Ledford , Jason Gunthorpe Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] IB: mlx5: no need to check return value of debugfs_create functions Message-ID: <20191104074141.GA1292396@kroah.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Cc: Leon Romanovsky Cc: Doug Ledford Cc: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman Acked-by: Leon Romanovsky --- drivers/infiniband/hw/mlx5/main.c | 62 +++++++--------------------- drivers/infiniband/hw/mlx5/mlx5_ib.h | 9 +--- 2 files changed, 16 insertions(+), 55 deletions(-) Note, I kind of need to take this through my tree now as I broke the build due to me changing the use of debugfs_create_atomic_t() in my tree and not noticing this being used here. Sorry about that, any objections? And 0-day seems really broken to have missed this for the past months, ugh, I need to stop relying on it... diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 831539419c30..059db0610445 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -5710,11 +5710,10 @@ static int mlx5_ib_rn_get_params(struct ib_device *device, u8 port_num, static void delay_drop_debugfs_cleanup(struct mlx5_ib_dev *dev) { - if (!dev->delay_drop.dbg) + if (!dev->delay_drop.dir_debugfs) return; - debugfs_remove_recursive(dev->delay_drop.dbg->dir_debugfs); - kfree(dev->delay_drop.dbg); - dev->delay_drop.dbg = NULL; + debugfs_remove_recursive(dev->delay_drop.dir_debugfs); + dev->delay_drop.dir_debugfs = NULL; } static void cancel_delay_drop(struct mlx5_ib_dev *dev) @@ -5765,52 +5764,22 @@ static const struct file_operations fops_delay_drop_timeout = { .read = delay_drop_timeout_read, }; -static int delay_drop_debugfs_init(struct mlx5_ib_dev *dev) +static void delay_drop_debugfs_init(struct mlx5_ib_dev *dev) { - struct mlx5_ib_dbg_delay_drop *dbg; + struct dentry *root; if (!mlx5_debugfs_root) - return 0; - - dbg = kzalloc(sizeof(*dbg), GFP_KERNEL); - if (!dbg) - return -ENOMEM; - - dev->delay_drop.dbg = dbg; - - dbg->dir_debugfs = - debugfs_create_dir("delay_drop", - dev->mdev->priv.dbg_root); - if (!dbg->dir_debugfs) - goto out_debugfs; - - dbg->events_cnt_debugfs = - debugfs_create_atomic_t("num_timeout_events", 0400, - dbg->dir_debugfs, - &dev->delay_drop.events_cnt); - if (!dbg->events_cnt_debugfs) - goto out_debugfs; - - dbg->rqs_cnt_debugfs = - debugfs_create_atomic_t("num_rqs", 0400, - dbg->dir_debugfs, - &dev->delay_drop.rqs_cnt); - if (!dbg->rqs_cnt_debugfs) - goto out_debugfs; - - dbg->timeout_debugfs = - debugfs_create_file("timeout", 0600, - dbg->dir_debugfs, - &dev->delay_drop, - &fops_delay_drop_timeout); - if (!dbg->timeout_debugfs) - goto out_debugfs; + return; - return 0; + root = debugfs_create_dir("delay_drop", dev->mdev->priv.dbg_root); + dev->delay_drop.dir_debugfs = root; -out_debugfs: - delay_drop_debugfs_cleanup(dev); - return -ENOMEM; + debugfs_create_atomic_t("num_timeout_events", 0400, root, + &dev->delay_drop.events_cnt); + debugfs_create_atomic_t("num_rqs", 0400, root, + &dev->delay_drop.rqs_cnt); + debugfs_create_file("timeout", 0600, root, &dev->delay_drop, + &fops_delay_drop_timeout); } static void init_delay_drop(struct mlx5_ib_dev *dev) @@ -5826,8 +5795,7 @@ static void init_delay_drop(struct mlx5_ib_dev *dev) atomic_set(&dev->delay_drop.rqs_cnt, 0); atomic_set(&dev->delay_drop.events_cnt, 0); - if (delay_drop_debugfs_init(dev)) - mlx5_ib_warn(dev, "Failed to init delay drop debugfs\n"); + delay_drop_debugfs_init(dev); } static void mlx5_ib_unbind_slave_port(struct mlx5_ib_dev *ibdev, diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index 1a98ee2e01c4..55ce599db803 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -792,13 +792,6 @@ enum { MLX5_MAX_DELAY_DROP_TIMEOUT_MS = 100, }; -struct mlx5_ib_dbg_delay_drop { - struct dentry *dir_debugfs; - struct dentry *rqs_cnt_debugfs; - struct dentry *events_cnt_debugfs; - struct dentry *timeout_debugfs; -}; - struct mlx5_ib_delay_drop { struct mlx5_ib_dev *dev; struct work_struct delay_drop_work; @@ -808,7 +801,7 @@ struct mlx5_ib_delay_drop { bool activate; atomic_t events_cnt; atomic_t rqs_cnt; - struct mlx5_ib_dbg_delay_drop *dbg; + struct dentry *dir_debugfs; }; enum mlx5_ib_stages {