linux-kernel - Re: [PATCH] scsi: ufs-bsg: Fix runtime PM imbalance on error

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Message-ID: <yq1k10fsmaj.fsf@ca-mkp.ca.oracle.com>
Date:   Tue, 09 Jun 2020 22:11:27 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Avri Altman <avri.altman@....com>
Cc:     kjlu@....edu, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        Can Guo <cang@...eaurora.org>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dinghao Liu <dinghao.liu@....edu.cn>
Subject: Re: [PATCH] scsi: ufs-bsg: Fix runtime PM imbalance on error


Avri: Please review!

> When ufs_bsg_alloc_desc_buffer() returns an error code,
> a pairing runtime PM usage counter decrement is needed
> to keep the counter balanced.
>
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/scsi/ufs/ufs_bsg.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufs_bsg.c b/drivers/scsi/ufs/ufs_bsg.c
> index 53dd87628cbe..516a7f573942 100644
> --- a/drivers/scsi/ufs/ufs_bsg.c
> +++ b/drivers/scsi/ufs/ufs_bsg.c
> @@ -106,8 +106,10 @@ static int ufs_bsg_request(struct bsg_job *job)
>  		desc_op = bsg_request->upiu_req.qr.opcode;
>  		ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
>  						&desc_len, desc_op);
> -		if (ret)
> +		if (ret) {
> +			pm_runtime_put_sync(hba->dev);
>  			goto out;
> +		}
>  
>  		/* fall through */
>  	case UPIU_TRANSACTION_NOP_OUT:

-- 
Martin K. Petersen	Oracle Linux Engineering