This patch replaces spinlock used in SRF with mutexs.
Spinlocks were initially used to take care of calls
to SRF from clock f/w. Now with those clock f/w hooks
no longer needed, there is no need to use spinlocks
in SRF.
Signed-off-by: Rajendra Nayak <[EMAIL PROTECTED]>
---
arch/arm/plat-omap/resource.c | 40 ++++++++++++++++------------------------
1 files changed, 16 insertions(+), 24 deletions(-)
Index: linux-omap-2.6/arch/arm/plat-omap/resource.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/resource.c 2008-11-10
15:44:22.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/resource.c 2008-11-10
16:43:47.000000000 +0530
@@ -33,8 +33,8 @@
/* res_list contains all registered struct shared_resource */
static LIST_HEAD(res_list);
-/* res_lock protects res_list add and del ops */
-static DEFINE_SPINLOCK(res_lock);
+/* res_mutex protects res_list add and del ops */
+static DECLARE_MUTEX(res_mutex);
/* Static Pool of users for a resource used till kmalloc becomes available */
struct users_list usr_list[MAX_USERS];
@@ -73,18 +73,17 @@ static struct shared_resource *_resource
*
* Looks for a registered resource by its name. Returns a pointer to
* the struct shared_resource if found, else returns NULL.
- * The function holds spinlocks and takes care of atomicity.
+ * The function holds mutex and takes care of atomicity.
*/
static struct shared_resource *resource_lookup(const char *name)
{
struct shared_resource *res;
- unsigned long flags;
if (!name)
return NULL;
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
res = _resource_lookup(name);
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
return res;
}
@@ -254,8 +253,6 @@ int resource_refresh(void)
*/
int resource_register(struct shared_resource *resp)
{
- unsigned long flags;
-
if (!resp)
return -EINVAL;
@@ -268,7 +265,7 @@ int resource_register(struct shared_reso
INIT_LIST_HEAD(&resp->users_list);
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
/* Add the resource to the resource list */
list_add(&resp->node, &res_list);
@@ -276,7 +273,7 @@ int resource_register(struct shared_reso
if (resp->ops->init)
resp->ops->init(resp);
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
pr_debug("resource: registered %s\n", resp->name);
return 0;
@@ -292,15 +289,13 @@ EXPORT_SYMBOL(resource_register);
*/
int resource_unregister(struct shared_resource *resp)
{
- unsigned long flags;
-
if (!resp)
return -EINVAL;
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
/* delete the resource from the resource list */
list_del(&resp->node);
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
pr_debug("resource: unregistered %s\n", resp->name);
@@ -330,9 +325,8 @@ int resource_request(const char *name, s
struct shared_resource *resp;
struct users_list *user;
int found = 0, ret = 0;
- unsigned long flags;
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
resp = _resource_lookup(name);
if (!resp) {
printk(KERN_ERR "resource_request: Invalid resource name\n");
@@ -368,7 +362,7 @@ int resource_request(const char *name, s
user->level = level;
res_unlock:
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
/*
* Recompute and set the current level for the resource.
* NOTE: update_resource level moved out of spin_lock, as it may call
@@ -398,9 +392,8 @@ int resource_release(const char *name, s
struct shared_resource *resp;
struct users_list *user;
int found = 0, ret = 0;
- unsigned long flags;
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
resp = _resource_lookup(name);
if (!resp) {
printk(KERN_ERR "resource_release: Invalid resource name\n");
@@ -428,7 +421,7 @@ int resource_release(const char *name, s
/* Recompute and set the current level for the resource */
ret = update_resource_level(resp);
res_unlock:
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
return ret;
}
EXPORT_SYMBOL(resource_release);
@@ -444,17 +437,16 @@ int resource_get_level(const char *name)
{
struct shared_resource *resp;
u32 ret;
- unsigned long flags;
- spin_lock_irqsave(&res_lock, flags);
+ down(&res_mutex);
resp = _resource_lookup(name);
if (!resp) {
printk(KERN_ERR "resource_release: Invalid resource name\n");
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
return -EINVAL;
}
ret = resp->curr_level;
- spin_unlock_irqrestore(&res_lock, flags);
+ up(&res_mutex);
return ret;
}
EXPORT_SYMBOL(resource_get_level);
--
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