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Subject: Re: [PATCH v3 3/3] scsi: ufs: Fix wrong Task Tag used in task
 management request UPIUs
To:     Can Guo <cang@codeaurora.org>
Cc:     jaegeuk@kernel.org, asutoshd@codeaurora.org,
        nguyenb@codeaurora.org, hongwus@codeaurora.org,
        linux-scsi@vger.kernel.org, kernel-team@android.com,
        Alim Akhtar <alim.akhtar@samsung.com>,
        Avri Altman <avri.altman@wdc.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>,
        Sujit Reddy Thumma <sthumma@codeaurora.org>,
        Vinayak Holikatti <vinholikatti@gmail.com>,
        Yaniv Gardi <ygardi@codeaurora.org>,
        open list <linux-kernel@vger.kernel.org>
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From:   Bart Van Assche <bvanassche@acm.org>
Message-ID: <00ae0fb0-4c35-686b-857c-b6cba40be83a@acm.org>
Date:   Sat, 6 Feb 2021 18:50:37 -0800
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On 2/4/21 10:09 PM, Can Guo wrote:
> That code is wrong. The Task Tag in Dword_0 should be the real tag we
> allocated for TMR. The transfer request Task Tag which we are trying to
> abort is given in Dword_5, which is the Input Parameter 3 of the TMR UPIU.
> I am not sure why the author gave hba->nutrs + req->tag as the Task Tag
> of one TMR, the commit msg abot this part is not quite informative....
> 
> Table 10.22 — Task Management Request UPIU
> TASK MANAGEMENT REQUEST UPIU
> ----------------------------------
> |0         |1      |2   |3       |
> ----------------------------------
> |xx00 0100b| Flags |LUN |Task Tag|
> ----------------------------------
> ...
> 16 (MSB)   |17     |18  |19 (LSB)|
> ----------------------------------
> Input Parameter 2
> ----------------------------------
> 
> Table 10.24 — Task Management Input Parameters
> Field Description
> Input Parameter 2 LSB: Task Tag of the task/command operated by the task
> management function.

Thanks for the clarification. Feel free to add the following to this patch:

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