Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 9 Aug 2021 11:07:30 +0200
From:   Jiri Pirko <jiri@resnulli.us>
To:     Leon Romanovsky <leon@kernel.org>
Cc:     "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Leon Romanovsky <leonro@nvidia.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Andrew Lunn <andrew@lunn.ch>, Ariel Elior <aelior@marvell.com>,
        Bin Luo <luobin9@huawei.com>,
        Claudiu Manoil <claudiu.manoil@nxp.com>,
        Coiby Xu <coiby.xu@gmail.com>,
        Derek Chickles <dchickles@marvell.com>, drivers@pensando.io,
        Felix Manlunas <fmanlunas@marvell.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Geetha sowjanya <gakula@marvell.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        GR-everest-linux-l2@marvell.com, GR-Linux-NIC-Dev@marvell.com,
        hariprasad <hkelam@marvell.com>,
        Ido Schimmel <idosch@nvidia.com>,
        intel-wired-lan@lists.osuosl.org,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Jerin Jacob <jerinj@marvell.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Jiri Pirko <jiri@nvidia.com>,
        Linu Cherian <lcherian@marvell.com>,
        linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-staging@lists.linux.dev, Manish Chopra <manishc@marvell.com>,
        Michael Chan <michael.chan@broadcom.com>,
        netdev@vger.kernel.org, oss-drivers@corigine.com,
        Richard Cochran <richardcochran@gmail.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Satanand Burla <sburla@marvell.com>,
        Shannon Nelson <snelson@pensando.io>,
        Simon Horman <simon.horman@corigine.com>,
        Subbaraya Sundeep <sbhatta@marvell.com>,
        Sunil Goutham <sgoutham@marvell.com>,
        Taras Chornyi <tchornyi@marvell.com>,
        Tariq Toukan <tariqt@nvidia.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        UNGLinuxDriver@microchip.com, Vadym Kochan <vkochan@marvell.com>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>
Subject: Re: [PATCH net-next] devlink: Set device as early as possible
Message-ID: <YRDwUrOK1YHsK7CE@nanopsycho>
References: <6859503f7e3e6cd706bf01ef06f1cae8c0b0970b.1628449004.git.leonro@nvidia.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <6859503f7e3e6cd706bf01ef06f1cae8c0b0970b.1628449004.git.leonro@nvidia.com>
Precedence: bulk

Sun, Aug 08, 2021 at 08:57:43PM CEST, leon@kernel.org wrote:
>From: Leon Romanovsky <leonro@nvidia.com>
>
>All kernel devlink implementations call to devlink_alloc() during
>initialization routine for specific device which is used later as
>a parent device for devlink_register().
>
>Such late device assignment causes to the situation which requires us to
>call to device_register() before setting other parameters, but that call
>opens devlink to the world and makes accessible for the netlink users.
>
>Any attempt to move devlink_register() to be the last call generates the
>following error due to access to the devlink->dev pointer.
>
>[    8.758862]  devlink_nl_param_fill+0x2e8/0xe50
>[    8.760305]  devlink_param_notify+0x6d/0x180
>[    8.760435]  __devlink_params_register+0x2f1/0x670
>[    8.760558]  devlink_params_register+0x1e/0x20
>
>The simple change of API to set devlink device in the devlink_alloc()
>instead of devlink_register() fixes all this above and ensures that
>prior to call to devlink_register() everything already set.
>
>Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Reviewed-by: Jiri Pirko <jiri@nvidia.com>