linux-kernel - Re: [PATCH] gpio: bcm-kona: memory corruption fix

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Date:	Mon, 8 Dec 2014 15:35:13 -0800
From:	Ray Jui <rjui@...adcom.com>
To:	Olof Johansson <olof@...om.net>, <linus.walleij@...aro.org>,
	<gnurou@...il.com>
CC:	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH] gpio: bcm-kona: memory corruption fix



On 12/8/2014 1:34 PM, Olof Johansson wrote:
> In one instance the base address of the internal controller state
> structure is passed into a function doing writel to an offset of
> the pointer passed in is used, instead of the register base.
>
> Once I found the bug, I also went back to check for other sparse
> warnings in the file, but found none. This one, however, triggered:
>
> drivers/gpio/gpio-bcm-kona.c:552:47: warning: incorrect type in argument 1 (different address spaces)
> drivers/gpio/gpio-bcm-kona.c:552:47:    expected void [noderef] <asn:2>*reg_base
> drivers/gpio/gpio-bcm-kona.c:552:47:    got struct bcm_kona_gpio *kona_gpio
> drivers/gpio/gpio-bcm-kona.c:556:47: warning: incorrect type in argument 1 (different address spaces)
> drivers/gpio/gpio-bcm-kona.c:556:47:    expected void [noderef] <asn:2>*reg_base
> drivers/gpio/gpio-bcm-kona.c:556:47:    got struct bcm_kona_gpio *kona_gpio
>
> As far as I can tell, this bug has been here for a long time and is
> not new, but I found it when hunting down another heisenbug on this
> platform.
>
> Not marking for stable since I am unaware of any upstream user of kona
> on a product that would benefit from it.
>
> Signed-off-by: Olof Johansson <olof@...om.net>

Acked-by: Ray Jui <rjui@...adcom.com>

> ---
>   drivers/gpio/gpio-bcm-kona.c |    4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
> index de0801e..d552cca 100644
> --- a/drivers/gpio/gpio-bcm-kona.c
> +++ b/drivers/gpio/gpio-bcm-kona.c
> @@ -549,11 +549,11 @@ static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio)
>   	/* disable interrupts and clear status */
>   	for (i = 0; i < kona_gpio->num_bank; i++) {
>   		/* Unlock the entire bank first */
> -		bcm_kona_gpio_write_lock_regs(kona_gpio, i, UNLOCK_CODE);
> +		bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, i, UNLOCK_CODE);
>   		writel(0xffffffff, reg_base + GPIO_INT_MASK(i));
>   		writel(0xffffffff, reg_base + GPIO_INT_STATUS(i));
>   		/* Now re-lock the bank */
> -		bcm_kona_gpio_write_lock_regs(kona_gpio, i, LOCK_CODE);
> +		bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, i, LOCK_CODE);
>   	}
>   }
>
>
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