linux-kernel - RE: [PATCH 1/2] mtd: use refcount to prevent corruption

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Date:   Sun, 16 Jul 2023 06:29:02 +0000
From:   "Usyskin, Alexander" <alexander.usyskin@...el.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>
CC:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Winkler, Tomas" <tomas.winkler@...el.com>,
        "Lubart, Vitaly" <vitaly.lubart@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Biju Das <biju.das.jz@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>
Subject: RE: [PATCH 1/2] mtd: use refcount to prevent corruption

> > With this patch applied, when I load up the module, I get the same 3
> > devices:
> > /dev/mtd0
> > /dev/mtd0ro
> > /dev/mtdblock0
> >
> > Upon removal, the below 2 devices still hang around:
> > /dev/mtd0
> > /dev/mtd0ro
> 
Our use-case do not produce mtdblock, maybe there are some imbalances of get/put?
I have somewhere version with pr_debug after every kref_get/put. That may help to catch where
it missed, I hope.

--
Alexander (Sasha) Usyskin

CSE FW Dev - Host SW
Intel Israel (74) Limited