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From:   Avri Altman <Avri.Altman@wdc.com>
To:     Can Guo <cang@codeaurora.org>,
        "asutoshd@codeaurora.org" <asutoshd@codeaurora.org>,
        "nguyenb@codeaurora.org" <nguyenb@codeaurora.org>,
        "hongwus@codeaurora.org" <hongwus@codeaurora.org>,
        "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
        "kernel-team@android.com" <kernel-team@android.com>
CC:     Alim Akhtar <alim.akhtar@samsung.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>
Subject: RE: [PATCH v2 1/3] scsi: ufs: Minor adjustments to error handling
Thread-Topic: [PATCH v2 1/3] scsi: ufs: Minor adjustments to error handling
Thread-Index: AQHXCm8VGyJQOUJ72k+Gqmf0n4Zi1KpyL8Yw
Date:   Wed, 3 Mar 2021 11:43:19 +0000
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 <1614145010-36079-2-git-send-email-cang@codeaurora.org>
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>=20
> In error handling prepare stage, after SCSI requests are blocked, do a
> down/up_write(clk_scaling_lock) to clean up the queuecommand() path.
> Meanwhile, stop eeh_work in case it disturbs error recovery. Moreover,
> reset ufshcd_state at the entrance of ufshcd_probe_hba(), since it may be
> called multiple times during error recovery.
>=20
> Signed-off-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>


> ---
>  drivers/scsi/ufs/ufshcd.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
>=20
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 80620c8..013eb73 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4987,6 +4987,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba,
> struct ufshcd_lrb *lrbp)
>                          * UFS device needs urgent BKOPs.
>                          */
>                         if (!hba->pm_op_in_progress &&
> +                           !ufshcd_eh_in_progress(hba) &&
>                             ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) =
&&
>                             schedule_work(&hba->eeh_work)) {
>                                 /*
> @@ -5784,13 +5785,20 @@ static void ufshcd_err_handling_prepare(struct
> ufs_hba *hba)
>                         ufshcd_suspend_clkscaling(hba);
>                 ufshcd_clk_scaling_allow(hba, false);
>         }
> +       ufshcd_scsi_block_requests(hba);
> +       /* Drain ufshcd_queuecommand() */
> +       down_write(&hba->clk_scaling_lock);
> +       up_write(&hba->clk_scaling_lock);
> +       cancel_work_sync(&hba->eeh_work);
>  }
>=20
>  static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
>  {
> +       ufshcd_scsi_unblock_requests(hba);
>         ufshcd_release(hba);
>         if (ufshcd_is_clkscaling_supported(hba))
>                 ufshcd_clk_scaling_suspend(hba, false);
> +       ufshcd_clear_ua_wluns(hba);
>         pm_runtime_put(hba->dev);
>  }
>=20
> @@ -5882,8 +5890,8 @@ static void ufshcd_err_handler(struct work_struct
> *work)
>         spin_unlock_irqrestore(hba->host->host_lock, flags);
>         ufshcd_err_handling_prepare(hba);
>         spin_lock_irqsave(hba->host->host_lock, flags);
> -       ufshcd_scsi_block_requests(hba);
> -       hba->ufshcd_state =3D UFSHCD_STATE_RESET;
> +       if (hba->ufshcd_state !=3D UFSHCD_STATE_ERROR)
> +               hba->ufshcd_state =3D UFSHCD_STATE_RESET;
>=20
>         /* Complete requests that have door-bell cleared by h/w */
>         ufshcd_complete_requests(hba);
> @@ -6042,12 +6050,8 @@ static void ufshcd_err_handler(struct work_struct
> *work)
>         }
>         ufshcd_clear_eh_in_progress(hba);
>         spin_unlock_irqrestore(hba->host->host_lock, flags);
> -       ufshcd_scsi_unblock_requests(hba);
>         ufshcd_err_handling_unprepare(hba);
>         up(&hba->host_sem);
> -
> -       if (!err && needs_reset)
> -               ufshcd_clear_ua_wluns(hba);
>  }
>=20
>  /**
> @@ -7858,6 +7862,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool async)
>         unsigned long flags;
>         ktime_t start =3D ktime_get();
>=20
> +       hba->ufshcd_state =3D UFSHCD_STATE_RESET;
> +
>         ret =3D ufshcd_link_startup(hba);
>         if (ret)
>                 goto out;
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linu=
x
> Foundation Collaborative Project.