linux-kernel - Re: [PATCH 1/6] auxbus: make to_auxiliary_drv accept and return a constant pointer

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Message-ID: <d2ffbc2d-0966-4210-a5d0-719c27d9adb1@intel.com>
Date: Tue, 11 Jun 2024 15:50:47 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>
CC: Dave Ertman <david.m.ertman@...el.com>, Ira Weiny <ira.weiny@...el.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>, Sakari Ailus
	<sakari.ailus@...ux.intel.com>, Bingbu Cao <bingbu.cao@...el.com>, "Tianshu
 Qiu" <tian.shu.qiu@...el.com>, Mauro Carvalho Chehab <mchehab@...nel.org>,
	Michael Chan <michael.chan@...adcom.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jesse Brandeburg
	<jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>,
	"Saeed Mahameed" <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Pierre-Louis Bossart
	<pierre-louis.bossart@...ux.intel.com>, Liam Girdwood <lgirdwood@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>, Bard Liao
	<yung-chuan.liao@...ux.intel.com>, Ranjani Sridharan
	<ranjani.sridharan@...ux.intel.com>, Daniel Baluta <daniel.baluta@....com>,
	Kai Vehmanen <kai.vehmanen@...ux.intel.com>, Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, "Richard
 Cochran" <richardcochran@...il.com>, <linux-media@...r.kernel.org>,
	<netdev@...r.kernel.org>, <intel-wired-lan@...ts.osuosl.org>,
	<linux-rdma@...r.kernel.org>, <sound-open-firmware@...a-project.org>,
	<linux-sound@...r.kernel.org>
Subject: Re: [PATCH 1/6] auxbus: make to_auxiliary_drv accept and return a
 constant pointer

On 6/11/24 15:01, Greg Kroah-Hartman wrote:
> In the quest to make struct device constant, start by making

just curious, how far it will go? eg. do you plan to convert
get/put_device() to accept const? or convert devlink API to accept
consts?

> to_auziliary_drv() return a constant pointer so that drivers that call

typo: s/auz/aux/

> this can be fixed up before the driver core changes.
> 
> As the return type previously was not constant, also fix up all callers
> that were assuming that the pointer was not going to be a constant one
> in order to not break the build.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


[...]

> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 0f17fc1181d2..7341e7c4ef24 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -2784,7 +2784,7 @@ static struct ice_pf *
>   ice_ptp_aux_dev_to_owner_pf(struct auxiliary_device *aux_dev)
>   {
>   	struct ice_ptp_port_owner *ports_owner;
> -	struct auxiliary_driver *aux_drv;
> +	const struct auxiliary_driver *aux_drv;
>   	struct ice_ptp *owner_ptp;
>   
>   	if (!aux_dev->dev.driver)
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> index 47e7c2639774..9a79674d27f1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> @@ -349,7 +349,7 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
>   {
>   	struct mlx5_priv *priv = &dev->priv;
>   	struct auxiliary_device *adev;
> -	struct auxiliary_driver *adrv;
> +	const struct auxiliary_driver *adrv;

nit: in netdev we do maintain RCT order of initialization

>   	int ret = 0, i;
>   
>   	devl_assert_locked(priv_to_devlink(dev));
> @@ -406,7 +406,7 @@ void mlx5_detach_device(struct mlx5_core_dev *dev, bool suspend)
>   {
>   	struct mlx5_priv *priv = &dev->priv;
>   	struct auxiliary_device *adev;
> -	struct auxiliary_driver *adrv;
> +	const struct auxiliary_driver *adrv;
>   	pm_message_t pm = {};
>   	int i;
>   

[...]