linux-kernel - Re: [PATCH v2 3/4] scsi: ufs: Avoid messing up the compl_time

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Message-ID: <CAGOxZ53JFyFVZoLY0bbc8P9YbfPo2ioMiRS4+67VniXNYRjJ6g@mail.gmail.com>
Date:   Mon, 18 Nov 2019 18:50:32 +0530
From:   Alim Akhtar <alim.akhtar@...il.com>
To:     Can Guo <cang@...eaurora.org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com,
        Mark Salyzyn <salyzyn@...gle.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.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>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] scsi: ufs: Avoid messing up the compl_time_stamp
 of lrbs

On Mon, Nov 18, 2019 at 9:27 AM Can Guo <cang@...eaurora.org> wrote:
>
> To be on the safe side, do not touch one lrb after clear its slot in the
> lrb_in_use bitmap to avoid messing up the next task which would possibly
> occupy this lrb.
>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
Tested-by: Alim Akhtar <alim.akhtar@...sung.com>

>  drivers/scsi/ufs/ufshcd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 8e7c362..5950a7c 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4902,12 +4902,14 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
>                         cmd->result = result;
>                         /* Mark completed command as NULL in LRB */
>                         lrbp->cmd = NULL;
> +                       lrbp->compl_time_stamp = ktime_get();
>                         clear_bit_unlock(index, &hba->lrb_in_use);
>                         /* Do not touch lrbp after scsi done */
>                         cmd->scsi_done(cmd);
>                         __ufshcd_release(hba);
>                 } else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
>                         lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
> +                       lrbp->compl_time_stamp = ktime_get();
>                         if (hba->dev_cmd.complete) {
>                                 ufshcd_add_command_trace(hba, index,
>                                                 "dev_complete");
> @@ -4916,8 +4918,6 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
>                 }
>                 if (ufshcd_is_clkscaling_supported(hba))
>                         hba->clk_scaling.active_reqs--;
> -
> -               lrbp->compl_time_stamp = ktime_get();
>         }
>
>         /* clear corresponding bits of completed commands */
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>


-- 
Regards,
Alim