linux-kernel - Re: [PATCH v2 1/4] scsi: ufs: Add checks before setting clk-gating states

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Message-ID: <31ef233b-2562-2f61-d899-587092b5c033@acm.org>
Date:   Mon, 13 Jul 2020 20:38:12 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] scsi: ufs: Add checks before setting clk-gating
 states

On 2020-07-13 19:28, Can Guo wrote:
> @@ -2538,7 +2540,8 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
>  		err = SCSI_MLQUEUE_HOST_BUSY;
>  		goto out;
>  	}
> -	WARN_ON(hba->clk_gating.state != CLKS_ON);
> +	if (ufshcd_is_clkgating_allowed(hba))
> +		WARN_ON(hba->clk_gating.state != CLKS_ON);

A minor comment: has it been considered to change this into the
following?

	WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
		hba->clk_gating.state != CLKS_ON);

Thanks,

Bart.