linux-kernel - Re: [PATCH] mtd: set mtd partition panic write flag

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Date:   Mon, 4 May 2020 19:29:36 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Kamal Dasu <kamal.dasu@...adcom.com>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] mtd: set mtd partition panic write flag

Hi Kamal,

Kamal Dasu <kamal.dasu@...adcom.com> wrote on Mon, 4 May 2020 11:20:16
-0400:

> On Sat, May 2, 2020 at 2:08 PM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> >
> > Hi Kamal,
> >
> > Miquel Raynal <miquel.raynal@...tlin.com> wrote on Thu, 9 Jan 2020
> > 18:28:07 +0100:
> >  
> > > Hi Kamal,
> > >
> > > Kamal Dasu <kamal.dasu@...adcom.com> wrote on Thu, 9 Jan 2020 10:25:59
> > > -0500:
> > >  
> > > > Miquel,
> > > >
> > > > Yes the issue is still open. I was trying to understand the suggestion
> > > > and did not get a reply on the question I had
> > > >
> > > > Richard wrote :
> > > > "So the right fix would be setting the parent's oops_panic_write in
> > > > mtd_panic_write().
> > > > Then we don't have to touch mtdpart.c"
> > > >
> > > > How do I get access to the parts parent in the core ?. Maybe I am
> > > > missing something.  
> > >
> > > I think the solution is to set the oops_panic_write of the root parent, instead of updating the flag of the mtd device itself (which is maybe a partition).
> > >
> > > Would this help?
> > >
> > > https://www.spinics.net/lists/linux-mtd/msg10454.html  
> >
> > I'm pinging you here as well, as I think you raise a real issue, and we
> > agreed on a solution, which can now be easily setup with the above
> > change which has been applied and support for functions like:
> >
> >         static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
> >         static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs)
> >         static inline bool mtd_is_partition(const struct mtd_info *mtd)
> >         static inline bool mtd_has_partitions(const struct mtd_info *mtd)
> >  
> 
> So I should only set  master->oops_panic_write  with the new code ?.

Yes, if you can still reproduce the issue and it solves your problem,
then it's I think a nice fix.

Thanks,
Miquèl