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Subject: Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user
 access through sysfs
From:   Bean Huo <huobean@gmail.com>
To:     Can Guo <cang@codeaurora.org>
Cc:     asutoshd@codeaurora.org, nguyenb@codeaurora.org,
        hongwus@codeaurora.org, ziqichen@codeaurora.org,
        rnayak@codeaurora.org, linux-scsi@vger.kernel.org,
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        rjw@rjwysocki.net, 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>,
        Nitin Rawat <nitirawa@codeaurora.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Satya Tangirala <satyat@google.com>,
        open list <linux-kernel@vger.kernel.org>
Date:   Tue, 12 Jan 2021 12:32:22 +0100
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On Tue, 2021-01-12 at 08:45 +0800, Can Guo wrote:
> > > > > to
> > > > > talk to UFS, OCP can happen on VCCQ/VCCQ2. This leads to
> > > > > system
> > > > > CRASH
> > > > > too.
> > > > 
> > > > the same as above, share the crash log.
> > > > 
> > > 
> > > If you have hand-on experiences on NoC and/or OCP issues, you
> > > won't
> > > ask
> > > for the crash log. The tricky parts about critial NoC and OCP
> > > issues
> > > is
> > 
> > OK, interesting. would you tell me which register access node in
> > ufs-
> > sysfs.c can trigger this crash? let me verify your statement.
> > 
> > 
> 
> I believe I have explained enough to prove we need this change.
> 
> If you are really interested in NoC and OCP, feel free to ping me
> on teams, I will show you how to trigger one and what is it like
> on my setup.
> 
> Can Guo.

Ok, I no meant to stop or slow down your patch merging,
meant to avoid redundant instruction cycles.

Avri and Stanley have been convinced. let it go at that and merge.

Thanks,
Bean