linux-kernel - Re: [PATCH] mtd: use refcount to prevent corruption

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Message-ID: <9732911.325628.1611780400338.JavaMail.zimbra@nod.at>
Date:   Wed, 27 Jan 2021 21:46:40 +0100 (CET)
From:   Richard Weinberger <richard@....at>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: use refcount to prevent corruption

Tomas,

----- Ursprüngliche Mail -----
> Von: "Tomas Winkler" <tomas.winkler@...el.com>
> An: "Miquel Raynal" <miquel.raynal@...tlin.com>, "richard" <richard@....at>, "Vignesh Raghavendra" <vigneshr@...com>,
> "linux-mtd" <linux-mtd@...ts.infradead.org>, "linux-kernel" <linux-kernel@...r.kernel.org>
> CC: "Tomas Winkler" <tomas.winkler@...el.com>
> Gesendet: Mittwoch, 27. Januar 2021 21:03:19
> Betreff: [PATCH] mtd: use refcount to prevent corruption

> When underlying device is removed mtd core will crash
> in case user space is still holding an open handle to a mtd device node.
> A proper refcounting is needed so device is release only when a
> partition has no active users. The current simple counter is not
> sufficient.

Can you please explain a little more what devices are involved?
Does it implement _get_device() and _put_device()?

Thanks,
//richard