Re: [PATCH] gpio_free might sleep, mips architecture

[Andrew Morton]

On Mon, 15 Sep 2008 22:02:41 +0200
Uwe Kleine-K__nig <ukleinek@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> According to the documentation gpio_free should only be called from task
> context only.  To make this more explicit add a might sleep to all
> implementations.
> 
> This patch changes the gpio_free implementations for the mips
> architecture.
> 
> Signed-off-by: Uwe Kleine-K__nig <ukleinek@xxxxxxxxxxxxxxxxxxxxxxxxxx>
> Cc: David Brownell <david-b@xxxxxxxxxxx>
> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
> Cc: linux-mips@xxxxxxxxxxxxxx
> Cc: Guennadi Liakhovetski <g.liakhovetski@xxxxxxxxxxxxxx>
> Cc: Greg KH <greg@xxxxxxxxx>
> Cc: Kay Sievers <kay.sievers@xxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> ---
>  include/asm-mips/mach-au1x00/gpio.h  |    2 ++
>  include/asm-mips/mach-bcm47xx/gpio.h |    3 +++
>  include/asm-mips/mach-rc32434/gpio.h |    2 ++
>  3 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/include/asm-mips/mach-au1x00/gpio.h b/include/asm-mips/mach-au1x00/gpio.h
> index 2dc61e0..31eddba 100644
> --- a/include/asm-mips/mach-au1x00/gpio.h
> +++ b/include/asm-mips/mach-au1x00/gpio.h
> @@ -1,6 +1,7 @@
>  #ifndef _AU1XXX_GPIO_H_
>  #define _AU1XXX_GPIO_H_
>  
> +#include <linux/kernel.h>
>  #include <linux/types.h>
>  
>  #define AU1XXX_GPIO_BASE	200
> @@ -31,6 +32,7 @@ static inline int gpio_request(unsigned gpio, const char *label)
>  static inline void gpio_free(unsigned gpio)
>  {
>  	/* Not yet implemented */
> +	might_sleep();
>  }
>  
>  static inline int gpio_direction_input(unsigned gpio)
> diff --git a/include/asm-mips/mach-bcm47xx/gpio.h b/include/asm-mips/mach-bcm47xx/gpio.h
> index cfc8f4d..af17ccd 100644
> --- a/include/asm-mips/mach-bcm47xx/gpio.h
> +++ b/include/asm-mips/mach-bcm47xx/gpio.h
> @@ -9,6 +9,8 @@
>  #ifndef __BCM47XX_GPIO_H
>  #define __BCM47XX_GPIO_H
>  
> +#include <linux/kernel.h>
> +
>  #define BCM47XX_EXTIF_GPIO_LINES	5
>  #define BCM47XX_CHIPCO_GPIO_LINES	16
>  
> @@ -25,6 +27,7 @@ static inline int gpio_request(unsigned gpio, const char *label)
>  
>  static inline void gpio_free(unsigned gpio)
>  {
> +	might_sleep();
>  }
>  
>  static inline int gpio_to_irq(unsigned gpio)
> diff --git a/include/asm-mips/mach-rc32434/gpio.h b/include/asm-mips/mach-rc32434/gpio.h
> index f946f5f..9b4722e 100644
> --- a/include/asm-mips/mach-rc32434/gpio.h
> +++ b/include/asm-mips/mach-rc32434/gpio.h
> @@ -13,6 +13,7 @@
>  #ifndef _RC32434_GPIO_H_
>  #define _RC32434_GPIO_H_
>  
> +#include <linux/kernel.h>
>  #include <linux/types.h>
>  
>  struct rb532_gpio_reg {
> @@ -88,6 +89,7 @@ static inline int gpio_request(unsigned gpio, const char *label)
>  static inline void gpio_free(unsigned gpio)
>  {
>  	/* Not yet implemented */
> +	might_sleep();
>  }
>  

There is no gpio_free() in linux-next's include/asm-mips/mach-rc32434/gpio.h
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