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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 DA5C8C433E0 for ; Fri, 29 May 2020 10:26:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9148207BC for ; Fri, 29 May 2020 10:26:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590747977; bh=9g8EAMUcXzL5rm8FvjmpgV+PpYS3jeOMP9iJf7zni+A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=2kQ83qldlglK+EezO/krvwghEaV77j75R6m7kJ34jE504kyedTYOl2MTtkKYsacju XwI7JkZCyTrc9eFnXtilwcNbOmNlSVh5VDi9YeF394FbfCGTbDc2ui8aO+EVMy1J9U pkF5IwnJGMGKvk+MGDBBqFBOTY9icJ0I9AadQe5Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726394AbgE2K0R (ORCPT ); Fri, 29 May 2020 06:26:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:57532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725681AbgE2K0Q (ORCPT ); Fri, 29 May 2020 06:26:16 -0400 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 48AE0206A4; Fri, 29 May 2020 10:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590747975; bh=9g8EAMUcXzL5rm8FvjmpgV+PpYS3jeOMP9iJf7zni+A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=11+ybmNgpO0uk2pdsPLC0m92TOgTsM8Jn35KIS5Nvel9j7bjOSBDz0wl82lnXB4GQ XGF6zQed67uJvx7GaMJBzfQv6SReTk3vE9dsKx6q15eAIClUlvn/svlZSsQkWGHGi5 WFeUz/0hO1/4WToAOSyETXwAuVoYlhxjB10RffsU= Date: Fri, 29 May 2020 12:26:13 +0200 From: Greg KH To: Luis Chamberlain Cc: keescook@chromium.org, yzaikin@google.com, nixiaoming@huawei.com, ebiederm@xmission.com, axboe@kernel.dk, clemens@ladisch.de, arnd@arndb.de, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, benh@kernel.crashing.org, rdna@fb.com, viro@zeniv.linux.org.uk, mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, vbabka@suse.cz, sfr@canb.auug.org.au, jack@suse.cz, amir73il@gmail.com, rafael@kernel.org, tytso@mit.edu, julia.lawall@lip6.fr, akpm@linux-foundation.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linuxppc-dev@lists.ozlabs.org, ocfs2-devel@oss.oracle.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH 09/13] firmware_loader: simplify sysctl declaration with register_sysctl_subdir() Message-ID: <20200529102613.GA1345939@kroah.com> References: <20200529074108.16928-1-mcgrof@kernel.org> <20200529074108.16928-10-mcgrof@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200529074108.16928-10-mcgrof@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 29, 2020 at 07:41:04AM +0000, Luis Chamberlain wrote: > From: Xiaoming Ni > > Move the firmware config sysctl table to fallback_table.c and use the > new register_sysctl_subdir() helper. This removes the clutter from > kernel/sysctl.c. > > Signed-off-by: Xiaoming Ni > Signed-off-by: Luis Chamberlain > --- > drivers/base/firmware_loader/fallback.c | 4 ++++ > drivers/base/firmware_loader/fallback.h | 11 ++++++++++ > drivers/base/firmware_loader/fallback_table.c | 22 +++++++++++++++++-- > include/linux/sysctl.h | 1 - > kernel/sysctl.c | 7 ------ > 5 files changed, 35 insertions(+), 10 deletions(-) So it now takes more lines than the old stuff? :( > > diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c > index d9ac7296205e..8190653ae9a3 100644 > --- a/drivers/base/firmware_loader/fallback.c > +++ b/drivers/base/firmware_loader/fallback.c > @@ -200,12 +200,16 @@ static struct class firmware_class = { > > int register_sysfs_loader(void) > { > + int ret = register_firmware_config_sysctl(); > + if (ret != 0) > + return ret; checkpatch :( > return class_register(&firmware_class); And if that fails? > } > > void unregister_sysfs_loader(void) > { > class_unregister(&firmware_class); > + unregister_firmware_config_sysctl(); > } > > static ssize_t firmware_loading_show(struct device *dev, > diff --git a/drivers/base/firmware_loader/fallback.h b/drivers/base/firmware_loader/fallback.h > index 06f4577733a8..7d2cb5f6ceb8 100644 > --- a/drivers/base/firmware_loader/fallback.h > +++ b/drivers/base/firmware_loader/fallback.h > @@ -42,6 +42,17 @@ void fw_fallback_set_default_timeout(void); > > int register_sysfs_loader(void); > void unregister_sysfs_loader(void); > +#ifdef CONFIG_SYSCTL > +extern int register_firmware_config_sysctl(void); > +extern void unregister_firmware_config_sysctl(void); > +#else > +static inline int register_firmware_config_sysctl(void) > +{ > + return 0; > +} > +static inline void unregister_firmware_config_sysctl(void) { } > +#endif /* CONFIG_SYSCTL */ > + > #else /* CONFIG_FW_LOADER_USER_HELPER */ > static inline int firmware_fallback_sysfs(struct firmware *fw, const char *name, > struct device *device, > diff --git a/drivers/base/firmware_loader/fallback_table.c b/drivers/base/firmware_loader/fallback_table.c > index 46a731dede6f..4234aa5ee5df 100644 > --- a/drivers/base/firmware_loader/fallback_table.c > +++ b/drivers/base/firmware_loader/fallback_table.c > @@ -24,7 +24,7 @@ struct firmware_fallback_config fw_fallback_config = { > EXPORT_SYMBOL_NS_GPL(fw_fallback_config, FIRMWARE_LOADER_PRIVATE); > > #ifdef CONFIG_SYSCTL > -struct ctl_table firmware_config_table[] = { > +static struct ctl_table firmware_config_table[] = { > { > .procname = "force_sysfs_fallback", > .data = &fw_fallback_config.force_sysfs_fallback, > @@ -45,4 +45,22 @@ struct ctl_table firmware_config_table[] = { > }, > { } > }; > -#endif > + > +static struct ctl_table_header *hdr; > +int register_firmware_config_sysctl(void) > +{ > + if (hdr) > + return -EEXIST; How can hdr be set? > + hdr = register_sysctl_subdir("kernel", "firmware_config", > + firmware_config_table); > + if (!hdr) > + return -ENOMEM; > + return 0; > +} > + > +void unregister_firmware_config_sysctl(void) > +{ > + if (hdr) > + unregister_sysctl_table(hdr); Why can't unregister_sysctl_table() take a null pointer value? And what sets 'hdr' (worst name for a static variable) to NULL so that it knows not to be unregistered again as it looks like register_firmware_config_sysctl() could be called multiple times. thanks, greg k-h