linux-kernel - Re: [PATCH v3 04/10] scsi: ufs-mediatek: Fix the timing of configuring device regulators

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Date:   Tue, 14 Jun 2022 09:33:57 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Stanley Chu <stanley.chu@...iatek.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com
Cc:     peter.wang@...iatek.com, chun-hung.wu@...iatek.com,
        alice.chao@...iatek.com, powen.kao@...iatek.com,
        mason.zhang@...iatek.com, qilin.tan@...iatek.com,
        lin.gui@...iatek.com, eddie.huang@...iatek.com,
        tun-yu.yu@...iatek.com, cc.chou@...iatek.com,
        chaotian.jing@...iatek.com, jiajie.hao@...iatek.com
Subject: Re: [PATCH v3 04/10] scsi: ufs-mediatek: Fix the timing of
 configuring device regulators

On 6/14/22 07:16, Stanley Chu wrote:
> +int ufs_mtk_system_suspend(struct device *dev)
> +{
> +	int ret = 0;
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +
> +	ret = ufshcd_system_suspend(dev);
> +
> +	if (!ret)
> +		ufs_mtk_vreg_set_lpm(hba, true);
> +
> +	return ret;
> +}


Please use the traditional kernel coding style and return early in case 
of an error. For the above code, that means to rewrite it as follows:

	struct ufs_hba *hba = dev_get_drvdata(dev);
	int ret;

	ret = ufshcd_system_suspend(dev);
	if (ret)
		return ret;

	ufs_mtk_vreg_set_lpm(hba, true);

	return 0;

> +int ufs_mtk_system_resume(struct device *dev)
> +{
> +	int ret = 0;
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +
> +	ufs_mtk_vreg_set_lpm(hba, false);
> +
> +	ret = ufshcd_system_resume(dev);
> +
> +	return ret;
> +}

Please remove the variable 'ret' from the above function.

> +int ufs_mtk_runtime_suspend(struct device *dev)
> +{
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +	int ret = 0;
> +
> +	ret = ufshcd_runtime_suspend(dev);
> +
> +	if (!ret)
> +		ufs_mtk_vreg_set_lpm(hba, true);
> +
> +	return ret;
> +}

Please use the "early return" style.

> +int ufs_mtk_runtime_resume(struct device *dev)
> +{
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +	int ret = 0;
> +
> +	ufs_mtk_vreg_set_lpm(hba, false);
> +
> +	ret = ufshcd_runtime_resume(dev);
> +
> +	return ret;
> +}

Please remove the variable 'ret' from the above function.

Thanks,

Bart.