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Subject: Re: [PATCH v4 04/10] scsi: ufs: Enable IRQ after enabling clocks in
 error handling preparation
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>,
        open list <linux-kernel@vger.kernel.org>
References: <1624433711-9339-1-git-send-email-cang@codeaurora.org>
 <1624433711-9339-5-git-send-email-cang@codeaurora.org>
From:   Bart Van Assche <bvanassche@acm.org>
Message-ID: <6883ba75-be7c-96a2-9c33-62a244a15f6e@acm.org>
Date:   Wed, 23 Jun 2021 14:20:34 -0700
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On 6/23/21 12:35 AM, Can Guo wrote:
> In error handling preparation, enable IRQ after enabling clocks in case
> unclocked register access happens.
> 
> Fixes: c72e79c0ad2bd ("scsi: ufs: Recover HBA runtime PM error in error handler")
> Signed-off-by: Can Guo <cang@codeaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ee70522..5f837c4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -5927,13 +5927,14 @@ static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
>  		 * can be OFF or in LPM.
>  		 */
>  		ufshcd_setup_hba_vreg(hba, true);
> -		ufshcd_enable_irq(hba);
>  		ufshcd_setup_vreg(hba, true);
>  		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
>  		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
>  		ufshcd_hold(hba, false);
> -		if (!ufshcd_is_clkgating_allowed(hba))
> +		if (!ufshcd_is_clkgating_allowed(hba)) {
>  			ufshcd_setup_clocks(hba, true);
> +			ufshcd_enable_irq(hba);
> +		}
>  		ufshcd_release(hba);
>  		pm_op = hba->is_wlu_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
>  		ufshcd_vops_resume(hba, pm_op);

Reviewed-by: Bart Van Assche <bvanassche@acm.org>