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Date:   Sat, 7 Jul 2018 11:59:16 +0200
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Zhouyang Jia <jiazhouyang09@gmail.com>
Cc:     David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mtd: gpio_flash: add error handling for
 ioremap_nocache
Message-ID: <20180707115916.1bbe954c@bbrezillon>
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        <1529632343-70907-1-git-send-email-jiazhouyang09@gmail.com>
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On Fri, 22 Jun 2018 09:52:20 +0800
Zhouyang Jia <jiazhouyang09@gmail.com> wrote:

> When ioremap_nocache fails, the lack of error-handling code may
> cause unexpected results.
> 
> This patch adds error-handling code after calling ioremap_nocache.
> 
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>

Applied.

Thanks,

Boris

> ---
> v1->v2:
> - Move the test just after the ioremap_nocache() call.
> ---
>  drivers/mtd/maps/gpio-addr-flash.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mtd/maps/gpio-addr-flash.c b/drivers/mtd/maps/gpio-addr-flash.c
> index 385305e..9d97236 100644
> --- a/drivers/mtd/maps/gpio-addr-flash.c
> +++ b/drivers/mtd/maps/gpio-addr-flash.c
> @@ -239,6 +239,9 @@ static int gpio_flash_probe(struct platform_device *pdev)
>  	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);
> +	if (!state->map.virt)
> +		return -ENOMEM;
> +
>  	state->map.phys       = NO_XIP;
>  	state->map.map_priv_1 = (unsigned long)state;
>