linux-kernel - Re: [PATCH] gpio: Move gpiochip_.*lock_as

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Date:   Thu, 5 Sep 2019 10:04:27 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alexandre Courbot <acourbot@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] gpio: Move gpiochip_.*lock_as_irq() to the proper ifdef

On 2019/9/4 23:46, Sebastian Andrzej Siewior wrote:
> In a recent commit the gpiochip_.*lock_as_irq() were moved and ended up
> in the wrong `ifdef' section. Now for !CONFIG_GPIOLIB the function is
> defined twice leading to an compile error.
> 
> Move the extern function declaration under CONFIG_GPIOLIB, the "static
> inline" version is already under !CONFIG_GPIOLIB.
> 
> Fixes: c7663fa2a6631 ("gpio: Move gpiochip_lock/unlock_as_irq to gpio/driver.h")
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  include/linux/gpio/driver.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> index b74a3bee85e5d..fb134ff20f6b2 100644
> --- a/include/linux/gpio/driver.h
> +++ b/include/linux/gpio/driver.h
> @@ -702,14 +702,14 @@ void gpiochip_free_own_desc(struct gpio_desc *desc);
>  void devprop_gpiochip_set_names(struct gpio_chip *chip,
>  				const struct fwnode_handle *fwnode);
>  
> -/* lock/unlock as IRQ */
> -int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
> -void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
> -
>  #ifdef CONFIG_GPIOLIB
>  
>  struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
>  
> +/* lock/unlock as IRQ */
> +int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
> +void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
> +
>  #else /* CONFIG_GPIOLIB */

Interesting, my patch indeed do the correct thing：

+/* lock/unlock as IRQ */
+int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
+void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
+
 #else /* CONFIG_GPIOLIB */

however, now in include/linux/gpio/driver.h, it is:

/* lock/unlock as IRQ */
int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);

#ifdef CONFIG_GPIOLIB

struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);

#else /* CONFIG_GPIOLIB */


Maybe this caused by the fuzzing?  Anyway, this fix the issue, so

Reviewed-by: YueHaibing <yuehaibing@...wei.com>

>  
>  static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
>