linux-kernel - Re: [PATCH v2 20/53] mtd: nand: denali: do not set mtd->name

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Message-ID: <20170327173146.655f090f@bbrezillon>
Date:   Mon, 27 Mar 2017 17:31:46 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org, laurent.monat@...uantique.com,
        thorsten.christiansson@...uantique.com,
        Enrico Jorns <ejo@...gutronix.de>,
        Jason Roberts <jason.e.roberts@...el.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Graham Moore <grmoore@...nsource.altera.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH v2 20/53] mtd: nand: denali: do not set mtd->name

On Wed, 22 Mar 2017 23:07:27 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> This will be filled by nand_scan_ident() later.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
> Changes in v2: None
> 
>  drivers/mtd/nand/denali.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
> index 3badb1d..1706975 100644
> --- a/drivers/mtd/nand/denali.c
> +++ b/drivers/mtd/nand/denali.c
> @@ -1495,7 +1495,6 @@ int denali_init(struct denali_nand_info *denali)
>  
>  	/* now that our ISR is registered, we can enable interrupts */
>  	denali_set_intr_modes(denali, true);
> -	mtd->name = "denali-nand";

Are you sure this is safe to do that? When mtd->name is NULL, the core
takes the parent name, and in the denali_dt case it's not "denali-nand",
which means you're breaking mtdparts compat.

>  	nand_set_flash_node(chip, denali->dev->of_node);
>  
>  	/* register the driver with the NAND core subsystem */