linux-kernel - Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err

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Message-ID: <4d85d61319e6991dda75a68cb466c86c8fea30e4.camel@gmail.com>
Date:   Mon, 11 Jan 2021 09:25:52 +0100
From:   Bean Huo <huobean@...il.com>
To:     Can Guo <cang@...eaurora.org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...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>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Nitin Rawat <nitirawa@...eaurora.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bart Van Assche <bvanassche@....org>,
        Satya Tangirala <satyat@...gle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user
 access through sysfs

On Mon, 2021-01-11 at 09:30 +0800, Can Guo wrote:
> > > +static inline bool ufshcd_is_sysfs_allowed(struct ufs_hba *hba)
> > > +{
> > > +       return !hba->shutting_down;
> > > +}
> > > +
> > 
> > 
> > Can,
> > 
> > Instead adding new shutting_down flag, can we use availible
> > variable
> > system_state?
> > 
> > Thanks,
> > Bean
> 
> Hi Bean,
> 
> I prefer the flag shutting_down, it tells us whether
> ufshcd_shutdown()
> has been invoked or not. It comes handy when debug some system crash
> issues caused by UFS during reboot/shutdown tests. system_state is
> too
> wide in this case.
> 

It is only a suggestion, and others LLD use system_state, you prefer
adding new flags.

Bean

> Thanks,
> Can Guo.