linux-kernel - Re: [PATCH] scsi: ufs: add missing host_lock in setup_xfer

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Date:   Tue, 13 Jul 2021 12:06:00 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Cc:     Stanley Chu <stanley.chu@...iatek.com>,
        Can Guo <cang@...eaurora.org>, Bean Huo <beanhuo@...ron.com>,
        Asutosh Das <asutoshd@...eaurora.org>
Subject: Re: [PATCH] scsi: ufs: add missing host_lock in setup_xfer_req

On 6/30/21 5:51 PM, Jaegeuk Kim wrote:
> This patch adds a host_lock which existed before on ufshcd_vops_setup_xfer_req.
> 
> Cc: Stanley Chu <stanley.chu@...iatek.com>
> Cc: Can Guo <cang@...eaurora.org>
> Cc: Bean Huo <beanhuo@...ron.com>
> Cc: Bart Van Assche <bvanassche@....org>
> Cc: Asutosh Das <asutoshd@...eaurora.org>
> Fixes: a45f937110fa ("scsi: ufs: Optimize host lock on transfer requests send/compl paths")
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>   drivers/scsi/ufs/ufshcd.h | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index c98d540ac044..194755c9ddfe 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -1229,8 +1229,13 @@ static inline int ufshcd_vops_pwr_change_notify(struct ufs_hba *hba,
>   static inline void ufshcd_vops_setup_xfer_req(struct ufs_hba *hba, int tag,
>   					bool is_scsi_cmd)
>   {
> -	if (hba->vops && hba->vops->setup_xfer_req)
> -		return hba->vops->setup_xfer_req(hba, tag, is_scsi_cmd);
> +	if (hba->vops && hba->vops->setup_xfer_req) {
> +		unsigned long flags;
> +
> +		spin_lock_irqsave(hba->host->host_lock, flags);
> +		hba->vops->setup_xfer_req(hba, tag, is_scsi_cmd);
> +		spin_unlock_irqrestore(hba->host->host_lock, flags);
> +	}
>   }
>   
>   static inline void ufshcd_vops_setup_task_mgmt(struct ufs_hba *hba,

Can anyone help with reviewing this patch?

Thanks,

Bart.