linux-kernel - Re: [PATCH v6 2/2] scsi: ufs: Do not rely on prefetched data

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Date:   Thu, 26 Mar 2020 22:58:19 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Can Guo <cang@...eaurora.org>
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>,
        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>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-kernel@...r.kernel.org (open list),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support)
Subject: Re: [PATCH v6 2/2] scsi: ufs: Do not rely on prefetched data


Can,

> We were setting bActiveICCLevel attribute for UFS device only once but
> type of this attribute has changed from persistent to volatile since
> UFS device specification v2.1. This attribute is set to the default
> value after power cycle or hardware reset event. It isn't safe to rely
> on prefetched data (only used for bActiveICCLevel attribute
> now). Hence this change removes the code related to data prefetching
> and set this parameter on every attempt to probe the UFS device.

Applied patch #2 to 5.7/scsi-queue. Awaiting Avri's feedback on patch
#1. Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering