Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user access through sysfs

Bean Huo
2021-01-11T10:05:33Z

On Mon, 2021-01-11 at 17:22 +0800, Can Guo wrote:
> > > meaning you are tring to access a register when clocks are
> > > disabled.
> > > This
> > > leads to system CRASH.
> > >
> >
> > OK, let it simple, share this kind of crash log becuase of access
> > sysfs
> > node in the shutdown flow.
> >
> >
> > > [2] OCP is over current protection. While UFS shutting down, you
> > > may
> > > have put UFS regulators to LPM. After that, if you are still
> > > trying
> > > 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.

Bean

>