linux-hardening - Re: [PATCH v2 07/14] mfd: zl3073x: Add components versions register defs

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Message-ID: <df6a57df-8916-4af2-9eee-10921f90ff93@kernel.org>
Date: Thu, 10 Apr 2025 09:13:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ivan Vecera <ivecera@...hat.com>, netdev@...r.kernel.org
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Jiri Pirko <jiri@...nulli.us>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Prathosh Satish <Prathosh.Satish@...rochip.com>,
 Lee Jones <lee@...nel.org>, Kees Cook <kees@...nel.org>,
 Andy Shevchenko <andy@...nel.org>, Andrew Morton
 <akpm@...ux-foundation.org>, Michal Schmidt <mschmidt@...hat.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 07/14] mfd: zl3073x: Add components versions register
 defs

On 09/04/2025 16:42, Ivan Vecera wrote:
> Add register definitions for components versions and report them
> during probe.
> 
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> ---
>  drivers/mfd/zl3073x-core.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/mfd/zl3073x-core.c b/drivers/mfd/zl3073x-core.c
> index f0d85f77a7a76..28f28d00da1cc 100644
> --- a/drivers/mfd/zl3073x-core.c
> +++ b/drivers/mfd/zl3073x-core.c
> @@ -1,7 +1,9 @@
>  // SPDX-License-Identifier: GPL-2.0-only
>  
>  #include <linux/array_size.h>
> +#include <linux/bitfield.h>
>  #include <linux/bits.h>
> +#include <linux/cleanup.h>
>  #include <linux/dev_printk.h>
>  #include <linux/device.h>
>  #include <linux/export.h>
> @@ -13,6 +15,14 @@
>  #include <net/devlink.h>
>  #include "zl3073x.h"
>  
> +/*
> + * Register Map Page 0, General
> + */
> +ZL3073X_REG16_DEF(id,			0x0001);
> +ZL3073X_REG16_DEF(revision,		0x0003);
> +ZL3073X_REG16_DEF(fw_ver,		0x0005);
> +ZL3073X_REG32_DEF(custom_config_ver,	0x0007);
> +
>  /*
>   * Regmap ranges
>   */
> @@ -196,7 +206,9 @@ static void zl3073x_devlink_unregister(void *ptr)
>   */
>  int zl3073x_dev_init(struct zl3073x_dev *zldev)
>  {
> +	u16 id, revision, fw_ver;
>  	struct devlink *devlink;
> +	u32 cfg_ver;
>  	int rc;
>  
>  	rc = devm_mutex_init(zldev->dev, &zldev->lock);
> @@ -205,6 +217,30 @@ int zl3073x_dev_init(struct zl3073x_dev *zldev)
>  		return rc;
>  	}
>  
> +	/* Take device lock */

What is a device lock? Why do you need to comment standard guards/mutexes?

> +	scoped_guard(zl3073x, zldev) {
> +		rc = zl3073x_read_id(zldev, &id);
> +		if (rc)
> +			return rc;
> +		rc = zl3073x_read_revision(zldev, &revision);
> +		if (rc)
> +			return rc;
> +		rc = zl3073x_read_fw_ver(zldev, &fw_ver);
> +		if (rc)
> +			return rc;
> +		rc = zl3073x_read_custom_config_ver(zldev, &cfg_ver);
> +		if (rc)
> +			return rc;
> +	}

Nothing improved here. Andrew comments are still valid and do not send
v3 before the discussion is resolved.

> +
> +	dev_info(zldev->dev, "ChipID(%X), ChipRev(%X), FwVer(%u)\n",
> +		 id, revision, fw_ver);
> +	dev_info(zldev->dev, "Custom config version: %lu.%lu.%lu.%lu\n",
> +		 FIELD_GET(GENMASK(31, 24), cfg_ver),
> +		 FIELD_GET(GENMASK(23, 16), cfg_ver),
> +		 FIELD_GET(GENMASK(15, 8), cfg_ver),
> +		 FIELD_GET(GENMASK(7, 0), cfg_ver));


Both should be dev_dbg. Your driver should be silent on success.

> +
>  	devlink = priv_to_devlink(zldev);
>  	devlink_register(devlink);
>  


Best regards,
Krzysztof