linux-kernel - Re: [PATCH v5 1/3] scsi: ufs: core: Fix mcq tag calcualtion

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Date:   Tue, 2 May 2023 15:35:25 +0800
From:   Stanley Chu <chu.stanley@...il.com>
To:     Po-Wen Kao <powen.kao@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        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>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        wsd_upstream@...iatek.com, peter.wang@...iatek.com,
        stanley.chu@...iatek.com, alice.chao@...iatek.com,
        naomi.chu@...iatek.com, chun-hung.wu@...iatek.com,
        cc.chou@...iatek.com, eddie.huang@...iatek.com,
        mason.zhang@...iatek.com, chaotian.jing@...iatek.com,
        jiajie.hao@...iatek.com
Subject: Re: [PATCH v5 1/3] scsi: ufs: core: Fix mcq tag calcualtion

Hi Po-Wen,

Po-Wen Kao <powen.kao@...iatek.com> 於 2023年4月24日 週一 下午10:13寫道：
>
> 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>
> Reviewed-by: Bart Van Assche <bvanassche@....org>
> Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
> Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
> Reviewed-by: Ziqi Chen <quic_ziqichen@...cinc.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));

Would you also need to consider the ufshcd_release_sdb_queue() case?

Thanks.
Stanley Chu