linux-kernel - Re: [PATCH v2 1/2] scsi: ufs: Probe for temperature notification support

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Date:   Thu, 9 Sep 2021 09:26:59 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Avri Altman <avri.altman@....com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bean Huo <beanhuo@...ron.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v2 1/2] scsi: ufs: Probe for temperature notification
 support

On 9/8/21 11:34 PM, Avri Altman wrote:
> +static bool ufs_temp_enabled(struct ufs_hba *hba, struct ufs_hwmon_data *data)
> +{
> +	u32 ee_mask;
> +
> +	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
> +			      QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &ee_mask))
> +		return false;
> +
> +	return (data->mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) ||
> +		(data->mask & ee_mask & MASK_EE_TOO_LOW_TEMP);
> +}

The above function uses data->mask but not data so it's probably better to pass
data->mask directly as the second argument.

> +static bool ufs_temp_valid(struct ufs_hba *hba, struct ufs_hwmon_data *data,
> +			   enum attr_idn idn, u32 value)
> +{
> +	return (idn == QUERY_ATTR_IDN_CASE_ROUGH_TEMP && value >= 1 &&
> +		value <= 250 && ufs_temp_enabled(hba, data)) ||
> +	      (idn == QUERY_ATTR_IDN_HIGH_TEMP_BOUND && value >= 100 &&
> +	       value <= 250) ||
> +	      (idn == QUERY_ATTR_IDN_LOW_TEMP_BOUND && value >= 1 &&
> +	       value <= 80);
> +}

Same comment for this function - if the above comment is addressed 'mask' can be
passed as an argument instead of 'data'.

> +static int ufs_get_temp(struct ufs_hba *hba, struct ufs_hwmon_data *data,
> +			enum attr_idn idn)
> +{
> +	u32 value;
> +
> +	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0, 0,
> +	    &value))
> +		return 0;
> +
> +	if (ufs_temp_valid(hba, data, idn, value))
> +		return value - 80;
> +
> +	return 0;
> +}

Same comment here.

> +void ufs_hwmon_remove(struct ufs_hba *hba)
> +{
> +	if (hba->hwmon_device) {
> +		struct ufs_hwmon_data *data =
> +			dev_get_drvdata(hba->hwmon_device);
> +
> +		hwmon_device_unregister(hba->hwmon_device);
> +		hba->hwmon_device = NULL;
> +		kfree(data);
> +	}
> +}

Please use the "early return" style since that is the most widely used style
in the Linux kernel (if (!hba->hwmon_device) return).

Thanks,

Bart.