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Subject[PATCH] add might_sleep() to all implementations of gpio_free
Date
According to Documentation gpio_free should only be called from task
context. To make this more explicit add a might_sleep.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Cc: Greg KH <greg@kroah.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
---
Hello,
I added #include <linux/kernel.h> for all files that didn't already have
it. And note I didn't test these changes.

Best regards
Uwe

arch/arm/mach-davinci/gpio.c | 2 ++
arch/arm/mach-ns9xxx/gpio.c | 2 ++
arch/arm/mach-orion5x/gpio.c | 2 ++
drivers/gpio/gpiolib.c | 2 ++
include/asm-arm/arch-at91/gpio.h | 2 ++
include/asm-arm/arch-imx/gpio.h | 3 +++
include/asm-arm/arch-ixp4xx/gpio.h | 3 +++
include/asm-arm/arch-ks8695/gpio.h | 3 +++
include/asm-mips/mach-au1x00/gpio.h | 2 ++
include/asm-mips/mach-bcm47xx/gpio.h | 3 +++
include/asm-mips/mach-rc32434/gpio.h | 2 ++
include/asm-x86/mach-rdc321x/gpio.h | 3 +++
include/linux/gpio.h | 3 +++
13 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-davinci/gpio.c b/arch/arm/mach-davinci/gpio.c
index 9c67886..663e621 100644
--- a/arch/arm/mach-davinci/gpio.c
+++ b/arch/arm/mach-davinci/gpio.c
@@ -43,6 +43,8 @@ EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
+ might_sleep();
+
if (gpio >= DAVINCI_N_GPIO)
return;

diff --git a/arch/arm/mach-ns9xxx/gpio.c b/arch/arm/mach-ns9xxx/gpio.c
index b3c963b..cc7141c 100644
--- a/arch/arm/mach-ns9xxx/gpio.c
+++ b/arch/arm/mach-ns9xxx/gpio.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/module.h>
+#include <linux/kernel.h>

#include <asm/arch-ns9xxx/gpio.h>
#include <asm/arch-ns9xxx/processor.h>
@@ -63,6 +64,7 @@ EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
+ might_sleep();
clear_bit(gpio, gpiores);
return;
}
diff --git a/arch/arm/mach-orion5x/gpio.c b/arch/arm/mach-orion5x/gpio.c
index d097979..f0ff5af 100644
--- a/arch/arm/mach-orion5x/gpio.c
+++ b/arch/arm/mach-orion5x/gpio.c
@@ -165,6 +165,8 @@ EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned pin)
{
+ might_sleep();
+
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return;
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index beaf6b3..049d37d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -291,6 +291,8 @@ void gpio_free(unsigned gpio)
unsigned long flags;
struct gpio_desc *desc;

+ might_sleep();
+
if (!gpio_is_valid(gpio)) {
WARN_ON(extra_checks);
return;
diff --git a/include/asm-arm/arch-at91/gpio.h b/include/asm-arm/arch-at91/gpio.h
index 0a241e2..2fd7a83 100644
--- a/include/asm-arm/arch-at91/gpio.h
+++ b/include/asm-arm/arch-at91/gpio.h
@@ -13,6 +13,7 @@
#ifndef __ASM_ARCH_AT91RM9200_GPIO_H
#define __ASM_ARCH_AT91RM9200_GPIO_H

+#include <linux/kernel.h>
#include <asm/irq.h>

#define PIN_BASE NR_AIC_IRQS
@@ -220,6 +221,7 @@ static inline int gpio_request(unsigned gpio, const char *label)

static inline void gpio_free(unsigned gpio)
{
+ might_sleep();
}

extern int gpio_direction_input(unsigned gpio);
diff --git a/include/asm-arm/arch-imx/gpio.h b/include/asm-arm/arch-imx/gpio.h
index 4860232..55b896e 100644
--- a/include/asm-arm/arch-imx/gpio.h
+++ b/include/asm-arm/arch-imx/gpio.h
@@ -1,5 +1,6 @@
#ifndef _IMX_GPIO_H

+#include <linux/kernel.h>
#include <asm/arch/imx-regs.h>

#define IMX_GPIO_ALLOC_MODE_NORMAL 0
@@ -63,6 +64,8 @@ static inline int gpio_request(unsigned gpio, const char *label)

static inline void gpio_free(unsigned gpio)
{
+ might_sleep();
+
imx_gpio_free(gpio);
}

diff --git a/include/asm-arm/arch-ixp4xx/gpio.h b/include/asm-arm/arch-ixp4xx/gpio.h
index 3a4c5b8..d804661 100644
--- a/include/asm-arm/arch-ixp4xx/gpio.h
+++ b/include/asm-arm/arch-ixp4xx/gpio.h
@@ -25,6 +25,7 @@
#ifndef __ASM_ARCH_IXP4XX_GPIO_H
#define __ASM_ARCH_IXP4XX_GPIO_H

+#include <linux/kernel.h>
#include <asm/hardware.h>

static inline int gpio_request(unsigned gpio, const char *label)
@@ -34,6 +35,8 @@ static inline int gpio_request(unsigned gpio, const char *label)

static inline void gpio_free(unsigned gpio)
{
+ might_sleep();
+
return;
}

diff --git a/include/asm-arm/arch-ks8695/gpio.h b/include/asm-arm/arch-ks8695/gpio.h
index 65ceea2..758df66 100644
--- a/include/asm-arm/arch-ks8695/gpio.h
+++ b/include/asm-arm/arch-ks8695/gpio.h
@@ -11,6 +11,8 @@
#ifndef __ASM_ARCH_GPIO_H_
#define __ASM_ARCH_GPIO_H_

+#include <linux/kernel.h>
+
#define KS8695_GPIO_0 0
#define KS8695_GPIO_1 1
#define KS8695_GPIO_2 2
@@ -74,6 +76,7 @@ static inline int gpio_request(unsigned int pin, const char *label)

static inline void gpio_free(unsigned int pin)
{
+ might_sleep();
}

#endif
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();
}

static inline int gpio_direction_input(unsigned gpio)
diff --git a/include/asm-x86/mach-rdc321x/gpio.h b/include/asm-x86/mach-rdc321x/gpio.h
index acce0b7..3639ece 100644
--- a/include/asm-x86/mach-rdc321x/gpio.h
+++ b/include/asm-x86/mach-rdc321x/gpio.h
@@ -1,6 +1,8 @@
#ifndef _RDC321X_GPIO_H
#define _RDC321X_GPIO_H

+#include <linux/kernel.h>
+
extern int rdc_gpio_get_value(unsigned gpio);
extern void rdc_gpio_set_value(unsigned gpio, int value);
extern int rdc_gpio_direction_input(unsigned gpio);
@@ -18,6 +20,7 @@ static inline int gpio_request(unsigned gpio, const char *label)

static inline void gpio_free(unsigned gpio)
{
+ might_sleep();
rdc_gpio_free(gpio);
}

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 98be6c5..570a4f3 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -8,6 +8,7 @@

#else

+#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>

@@ -32,6 +33,8 @@ static inline int gpio_request(unsigned gpio, const char *label)

static inline void gpio_free(unsigned gpio)
{
+ might_sleep();
+
/* GPIO can never have been requested */
WARN_ON(1);
}
--
1.5.6.3
--
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