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| author | Jim Cromie <jim.cromie@gmail.com> | 2006-06-27 02:54:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:43 -0700 |
| commit | 8bcf6135c3e8cdfab375f4041a48721483519eee (patch) | |
| tree | 06658c8beb4a8e0e3808ca962fced3166a0eb22b /drivers/char/pc8736x_gpio.c | |
| parent | 6cad56fd884b7eb85ae193c94b688fe76680fcbf (diff) | |
| download | linux-stable-8bcf6135c3e8cdfab375f4041a48721483519eee.tar.gz linux-stable-8bcf6135c3e8cdfab375f4041a48721483519eee.tar.bz2 linux-stable-8bcf6135c3e8cdfab375f4041a48721483519eee.zip | |
[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>
Diffstat (limited to 'drivers/char/pc8736x_gpio.c')
| -rw-r--r-- | drivers/char/pc8736x_gpio.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/pc8736x_gpio.c b/drivers/char/pc8736x_gpio.c index b8183d508332..72dcf222f141 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 @@ static int major; /* default to dynamic major */ 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 @@ static inline u32 pc8736x_gpio_configure_fn(unsigned index, u32 mask, u32 bits, 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 @@ static inline u32 pc8736x_gpio_configure_fn(unsigned index, u32 mask, u32 bits, 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; } |