linux-kernel - Re: [PATCH v2 1/1] scsi: ufs: Fix unexpected values get from ufshcd_read_desc

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Message-ID: <5271e570f2e38770da3b23f13e739e41@codeaurora.org>
Date:   Mon, 26 Oct 2020 11:19:43 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] scsi: ufs: Fix unexpected values get from
 ufshcd_read_desc_param()

Hi Avri,

On 2020-10-22 14:37, Avri Altman wrote:
>> Since WB feature has been added, WB related sysfs entries can be 
>> accessed
>> even when an UFS device does not support WB feature. In that case, the
>> descriptors which are not supported by the UFS device may be wrongly
>> reported when they are accessed from their corrsponding sysfs entries.
>> Fix it by adding a sanity check of parameter offset against the actual
>> decriptor length.s
> This should be a bug fix IMO, and be dealt with similarly like
> ufshcd_is_wb_attrs or ufshcd_is_wb_flag.
> Thanks,
> Avri

Could you please elaborate on ufshcd_is_wb_attrs or ufshcd_is_wb_flag?
Sorry that I don't quite get it.

Thanks,

Can Guo.