linux-kernel - Re: [PATCH 1/2] scsi: ufs: core: Fix mcq tag calcualtion

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Message-ID: <20230216074040.GB2420@thinkpad>
Date:   Thu, 16 Feb 2023 13:10:40 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Po-Wen Kao <powen.kao@...iatek.com>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        wsd_upstream@...iatek.com, peter.wang@...iatek.com,
        stanley.chu@...iatek.com, alice.chao@...iatek.com,
        chun-hung.wu@...iatek.com, cc.chou@...iatek.com,
        chaotian.jing@...iatek.com, jiajie.hao@...iatek.com,
        mason.zhang@...iatek.com, quic_asutoshd@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] scsi: ufs: core: Fix mcq tag calcualtion

On Wed, Feb 15, 2023 at 08:37:45PM +0800, Po-Wen Kao wrote:
> Transfer command descriptor is allocated in ufshcd_memory_alloc()
> and referenced by transfer request descriptor with stride size
> sizeof_utp_transfer_cmd_desc()
> instead of
> sizeof(struct utp_transfer_cmd_desc).
> 
> Consequently, computing tag by address offset should also refer to the
> same stride.
> 
> Signed-off-by: Po-Wen Kao <powen.kao@...iatek.com>

Fixes tag?

> ---
>  drivers/ufs/core/ufs-mcq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 31df052fbc41..3a27fa4b0024 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -265,7 +265,7 @@ static int ufshcd_mcq_get_tag(struct ufs_hba *hba,
>  	addr = (le64_to_cpu(cqe->command_desc_base_addr) & CQE_UCD_BA) -
>  		hba->ucdl_dma_addr;
>  
> -	return div_u64(addr, sizeof(struct utp_transfer_cmd_desc));
> +	return div_u64(addr, sizeof_utp_transfer_cmd_desc(hba));

I think it is not a good practice to name variables after the standard
operators like sizeof(). It is confusing at its best.

How about renaming this function to get_ucd_size() or something relevant?

But the change itself LGTM!

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

>  }
>  
>  static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,
> -- 
> 2.18.0
> 

-- 
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