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

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Date:   Wed, 15 Feb 2023 09:34:07 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Po-Wen Kao <powen.kao@...iatek.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     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 2/15/23 04:37, 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>
> ---
>   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));
>   }
>   
>   static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,

Reviewed-by: Bart Van Assche <bvanassche@....org>