linux-kernel - Re: [PATCH v5 1/7] scsi: ufs: avoid to call REQ_CLKS_OFF to CLKS

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Date:   Wed, 18 Nov 2020 11:54:51 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, alim.akhtar@...sung.com,
        avri.altman@....com, bvanassche@....org,
        martin.petersen@...cle.com, stanley.chu@...iatek.com
Subject: Re: [PATCH v5 1/7] scsi: ufs: avoid to call REQ_CLKS_OFF to CLKS_OFF

On 2020-11-18 00:58, Jaegeuk Kim wrote:
> Once UFS was gated with CLKS_OFF, it should not call REQ_CLKS_OFF 
> again, which
> caused hibern8_enter failure.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Can Guo <cang@...eaurora.org>

> ---
>  drivers/scsi/ufs/ufshcd.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b8f573a02713..cc8d5f0c3fdc 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1745,7 +1745,8 @@ static void __ufshcd_release(struct ufs_hba *hba)
>  	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended ||
>  	    hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL ||
>  	    ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks ||
> -	    hba->active_uic_cmd || hba->uic_async_done)
> +	    hba->active_uic_cmd || hba->uic_async_done ||
> +	    hba->clk_gating.state == CLKS_OFF)
>  		return;
> 
>  	hba->clk_gating.state = REQ_CLKS_OFF;