linux-kernel - Re: [PATCH 05/10] scsi: ufs: Complete the cmd before returning in queuecommand

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Date:   Wed, 23 Jun 2021 15:39:46 +0800
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        cang@...eaurora.org
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>,
        Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] scsi: ufs: Complete the cmd before returning in
 queuecommand

Sorry, please ignore this change, it is wrongly sent out along with this 
series...

On 2021-06-23 15:35, Can Guo wrote:
> Commit 7a7e66c65d4148fc3f23b058405bc9f102414fcb ("scsi: ufs: Fix a race
> condition between ufshcd_abort() and eh_work()") forgot to complete the
> cmd, which takes an occupied lrb, before returning in queuecommand. 
> This
> change adds the missing codes.
> 
> Fixes: 7a7e66c65d414 ("scsi: ufs: Fix a race condition between
> ufshcd_abort() and eh_work()")
> Signed-off-by: Can Guo <cang@...eaurora.org>
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 5f837c4..7fbc63e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -2758,6 +2758,16 @@ static int ufshcd_queuecommand(struct Scsi_Host
> *host, struct scsi_cmnd *cmd)
>  		goto out;
>  	}
> 
> +	if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
> +		if (hba->wlu_pm_op_in_progress) {
> +			set_host_byte(cmd, DID_BAD_TARGET);
> +			cmd->scsi_done(cmd);
> +		} else {
> +			err = SCSI_MLQUEUE_HOST_BUSY;
> +		}
> +		goto out;
> +	}
> +
>  	hba->req_abort_count = 0;
> 
>  	err = ufshcd_hold(hba, true);
> @@ -2768,15 +2778,6 @@ static int ufshcd_queuecommand(struct Scsi_Host
> *host, struct scsi_cmnd *cmd)
>  	WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
>  		(hba->clk_gating.state != CLKS_ON));
> 
> -	if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
> -		if (hba->wlu_pm_op_in_progress)
> -			set_host_byte(cmd, DID_BAD_TARGET);
> -		else
> -			err = SCSI_MLQUEUE_HOST_BUSY;
> -		ufshcd_release(hba);
> -		goto out;
> -	}
> -
>  	lrbp = &hba->lrb[tag];
>  	WARN_ON(lrbp->cmd);
>  	lrbp->cmd = cmd;