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Subject: Re: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and
 is_sys_suspended
To:     Can Guo <cang@codeaurora.org>, asutoshd@codeaurora.org,
        nguyenb@codeaurora.org, hongwus@codeaurora.org,
        ziqichen@codeaurora.org, linux-scsi@vger.kernel.org,
        kernel-team@android.com
Cc:     Alim Akhtar <alim.akhtar@samsung.com>,
        Avri Altman <avri.altman@wdc.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Stanley Chu <stanley.chu@mediatek.com>,
        Bean Huo <beanhuo@micron.com>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Satya Tangirala <satyat@google.com>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        open list <linux-kernel@vger.kernel.org>
References: <1624433711-9339-1-git-send-email-cang@codeaurora.org>
 <1624433711-9339-3-git-send-email-cang@codeaurora.org>
From:   Bart Van Assche <bvanassche@acm.org>
Message-ID: <77b92c6e-2e1c-c799-f6ac-04467175f96a@acm.org>
Date:   Thu, 24 Jun 2021 10:35:33 -0700
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On 6/23/21 12:35 AM, Can Guo wrote:
> @@ -9141,6 +9143,8 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>  
>  	if (!hba->is_powered)
>  		return 0;
> +
> +	hba->pm_op_in_progress = true;
>  	/*
>  	 * Disable the host irq as host controller as there won't be any
>  	 * host controller transaction expected till resume.
> @@ -9160,6 +9164,7 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>  	ufshcd_vreg_set_lpm(hba);
>  	/* Put the host controller in low power mode if possible */
>  	ufshcd_hba_vreg_set_lpm(hba);
> +	hba->pm_op_in_progress = false;
>  	return ret;
>  }
>  
> @@ -9179,6 +9184,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>  	if (!hba->is_powered)
>  		return 0;
>  
> +	hba->pm_op_in_progress = true;
>  	ufshcd_hba_vreg_set_hpm(hba);
>  	ret = ufshcd_vreg_set_hpm(hba);
>  	if (ret)
> @@ -9198,6 +9204,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>  out:
>  	if (ret)
>  		ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
> +	hba->pm_op_in_progress = false;
>  	return ret;
>  }

Has it been considered to check dev->power.runtime_status instead of
introducing the pm_op_in_progress variable?

Thanks,

Bart.