[PATCH] chardev: GPIO for SCx200 & PC-8736x: replace spinlocks w mutexes
Replace spinlocks guarding gpio config ops with mutexes. This is a me-too
patch, and is justifiable insofar as mutexes have stricter semantics and
better debugging support, so are preferred where they are applicable.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/char/pc8736x_gpio.c b/drivers/char/pc8736x_gpio.c
index b8183d5..72dcf22 100644
--- a/drivers/char/pc8736x_gpio.c
+++ b/drivers/char/pc8736x_gpio.c
@@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>
+#include <linux/mutex.h>
#include <linux/nsc_gpio.h>
#include <linux/platform_device.h>
#include <asm/uaccess.h>
@@ -31,7 +32,7 @@
module_param(major, int, 0);
MODULE_PARM_DESC(major, "Major device number");
-static DEFINE_SPINLOCK(pc8736x_gpio_config_lock);
+static DEFINE_MUTEX(pc8736x_gpio_config_lock);
static unsigned pc8736x_gpio_base;
static u8 pc8736x_gpio_shadow[4];
@@ -119,9 +120,8 @@
u32 func_slct)
{
u32 config, new_config;
- unsigned long flags;
- spin_lock_irqsave(&pc8736x_gpio_config_lock, flags);
+ mutex_lock(&pc8736x_gpio_config_lock);
device_select(SIO_GPIO_UNIT);
select_pin(index);
@@ -133,7 +133,7 @@
new_config = (config & mask) | bits;
superio_outb(func_slct, new_config);
- spin_unlock_irqrestore(&pc8736x_gpio_config_lock, flags);
+ mutex_unlock(&pc8736x_gpio_config_lock);
return config;
}