linux-kernel - Re: [PATCH 2/8] mtd: maps: gpio-addr-flash: Fix ioremapped size

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Message-ID: <20180828162611.2f45e5c9@bbrezillon>
Date:   Tue, 28 Aug 2018 16:26:11 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Zhouyang Jia <jiazhouyang09@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] mtd: maps: gpio-addr-flash: Fix ioremapped size

On Tue, 21 Aug 2018 16:31:46 +0200
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:

> We should only iomap the area of the chip that is memory mapped.
> Otherwise we could be mapping devices beyond the memory space or that
> belong to other devices.
> 

Can you add

Fixes: ebd71e3a4861 ("mtd: maps: gpio-addr-flash: fix warnings and make more portable")

and in case you want to backport the fix:

Cc: <stable@...r.kernel.org>

> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> ---
>  drivers/mtd/maps/gpio-addr-flash.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/maps/gpio-addr-flash.c b/drivers/mtd/maps/gpio-addr-flash.c
> index 17be47f72973..6de16e81994c 100644
> --- a/drivers/mtd/maps/gpio-addr-flash.c
> +++ b/drivers/mtd/maps/gpio-addr-flash.c
> @@ -234,7 +234,7 @@ static int gpio_flash_probe(struct platform_device *pdev)
>  	state->map.copy_to    = gf_copy_to;
>  	state->map.bankwidth  = pdata->width;
>  	state->map.size       = state->win_size * (1 << state->gpio_count);
> -	state->map.virt       = ioremap_nocache(memory->start, state->map.size);
> +	state->map.virt       = ioremap_nocache(memory->start, state->win_size);
>  	if (!state->map.virt)
>  		return -ENOMEM;
>