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[ARM] sa1100: use mutexes rather than semaphores

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Use a mutex in the sa1100 clock support rather than a semaphore.
Remove the unused "module" field.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-04-22 10:08:58 +01:00 committed by Russell King
parent 235b185ce4
commit d0a9d75b9c
1 changed files with 13 additions and 11 deletions
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24
arch/arm/mach-sa1100/clock.c
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@ -9,14 +9,17 @@
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/hardware.h>
#include <asm/semaphore.h>
/*
* Very simple clock implementation - we only have one clock to
* deal with at the moment, so we only match using the "name".
*/
struct clk {
struct list_head node;
unsigned long rate;
struct module *owner;
const char *name;
unsigned int enabled;
void (*enable)(void);
@ -24,21 +27,21 @@ struct clk {
};
static LIST_HEAD(clocks);
static DECLARE_MUTEX(clocks_sem);
static DEFINE_MUTEX(clocks_mutex);
static DEFINE_SPINLOCK(clocks_lock);
struct clk *clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);
down(&clocks_sem);
mutex_lock(&clocks_mutex);
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
if (strcmp(id, p->name) == 0) {
clk = p;
break;
}
}
up(&clocks_sem);
mutex_unlock(&clocks_mutex);
return clk;
}
@ -46,7 +49,6 @@ EXPORT_SYMBOL(clk_get);
void clk_put(struct clk *clk)
{
module_put(clk->owner);
}
EXPORT_SYMBOL(clk_put);
@ -109,18 +111,18 @@ static struct clk clk_gpio27 = {
int clk_register(struct clk *clk)
{
down(&clocks_sem);
mutex_lock(&clocks_mutex);
list_add(&clk->node, &clocks);
up(&clocks_sem);
mutex_unlock(&clocks_mutex);
return 0;
}
EXPORT_SYMBOL(clk_register);
void clk_unregister(struct clk *clk)
{
down(&clocks_sem);
mutex_lock(&clocks_mutex);
list_del(&clk->node);
up(&clocks_sem);
mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clk_unregister);