OMAP2+: hwmod: Remove omap_hwmod_mutex

The hwmod list will be built are init time and never
be modified at runtime. There is no need anymore to protect
the list from concurrent accesses using a mutex.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 1a0dd56..91b011e 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -159,8 +159,6 @@
 /* omap_hwmod_list contains all registered struct omap_hwmods */
 static LIST_HEAD(omap_hwmod_list);
 
-static DEFINE_MUTEX(omap_hwmod_mutex);
-
 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
 static struct omap_hwmod *mpu_oh;
 
@@ -872,7 +870,6 @@ static void _shutdown_sysc(struct omap_hwmod *oh)
  * @name: find an omap_hwmod by name
  *
  * Return a pointer to an omap_hwmod by name, or NULL if not found.
- * Caller must hold omap_hwmod_mutex.
  */
 static struct omap_hwmod *_lookup(const char *name)
 {
@@ -1443,14 +1440,10 @@ static int __init _register(struct omap_hwmod *oh)
            (oh->_state != _HWMOD_STATE_UNKNOWN))
                return -EINVAL;
 
-       mutex_lock(&omap_hwmod_mutex);
-
        pr_debug("omap_hwmod: %s: registering\n", oh->name);
 
-       if (_lookup(oh->name)) {
-               ret = -EEXIST;
-               goto ohr_unlock;
-       }
+       if (_lookup(oh->name))
+               return -EEXIST;
 
        ms_id = _find_mpu_port_index(oh);
        if (!IS_ERR_VALUE(ms_id)) {
@@ -1468,8 +1461,6 @@ static int __init _register(struct omap_hwmod *oh)
 
        ret = 0;
 
-ohr_unlock:
-       mutex_unlock(&omap_hwmod_mutex);
        return ret;
 }
 
@@ -1538,9 +1529,7 @@ struct omap_hwmod *omap_hwmod_lookup(const char *name)
        if (!name)
                return NULL;
 
-       mutex_lock(&omap_hwmod_mutex);
        oh = _lookup(name);
-       mutex_unlock(&omap_hwmod_mutex);
 
        return oh;
 }
@@ -1566,13 +1555,11 @@ int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
        if (!fn)
                return -EINVAL;
 
-       mutex_lock(&omap_hwmod_mutex);
        list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
                ret = (*fn)(temp_oh, data);
                if (ret)
                        break;
        }
-       mutex_unlock(&omap_hwmod_mutex);
 
        return ret;
 }
@@ -2112,9 +2099,8 @@ int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
  * @fn: callback function pointer to call for each hwmod in class @classname
  * @user: arbitrary context data to pass to the callback function
  *
- * For each omap_hwmod of class @classname, call @fn.  Takes
- * omap_hwmod_mutex to prevent the hwmod list from changing during the
- * iteration.  If the callback function returns something other than
+ * For each omap_hwmod of class @classname, call @fn.
+ * If the callback function returns something other than
  * zero, the iterator is terminated, and the callback function's return
  * value is passed back to the caller.  Returns 0 upon success, -EINVAL
  * if @classname or @fn are NULL, or passes back the error code from @fn.
@@ -2133,8 +2119,6 @@ int omap_hwmod_for_each_by_class(const char *classname,
        pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
                 __func__, classname);
 
-       mutex_lock(&omap_hwmod_mutex);
-
        list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
                if (!strcmp(temp_oh->class->name, classname)) {
                        pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
@@ -2145,8 +2129,6 @@ int omap_hwmod_for_each_by_class(const char *classname,
                }
        }
 
-       mutex_unlock(&omap_hwmod_mutex);
-
        if (ret)
                pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
                         __func__, ret);