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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2007-04-22 10:08:58 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-04-22 10:08:58 +0100
commitd0a9d75b9cd9cc8097c746611cc57cc8438b94be (patch)
tree32684a761660f0f68681da6994534065c22a2a3b /arch/arm/mach-sa1100
parent235b185ce47ce64793362bd3ae4bcd8afc6b57b8 (diff)
[ARM] sa1100: use mutexes rather than semaphores
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>
Diffstat (limited to 'arch/arm/mach-sa1100')
-rw-r--r--arch/arm/mach-sa1100/clock.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/arch/arm/mach-sa1100/clock.c b/arch/arm/mach-sa1100/clock.c
index b1e8fd766c1a..fc97fe57ee6f 100644
--- a/arch/arm/mach-sa1100/clock.c
+++ b/arch/arm/mach-sa1100/clock.c
@@ -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);