ARM: OMAP2+: hwmod: consolidate finding the MPU port index and storing it

An IP block's MPU interface port only needs to be found once.  The result
can be cached to speed further lookups.  This patch consolidates these
two steps into a single function.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>

arch/arm/mach-omap2/omap_hwmod.c

@@ -1008,37 +1008,34 @@ static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
 }
 
 /**
- * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
+ * _save_mpu_port_index - find and save the index to @oh's MPU port
  * @oh: struct omap_hwmod *
  *
- * Returns the array index of the OCP slave port that the MPU
- * addresses the device on, or -EINVAL upon error or not found.
+ * Determines the array index of the OCP slave port that the MPU uses
+ * to address the device, and saves it into the struct omap_hwmod.
+ * Intended to be called during hwmod registration only. No return
+ * value.
  */
-static int __init _find_mpu_port_index(struct omap_hwmod *oh)
+static void __init _save_mpu_port_index(struct omap_hwmod *oh)
 {
-	struct omap_hwmod_ocp_if *os;
+	struct omap_hwmod_ocp_if *os = NULL;
 	int i = 0;
-	int found = 0;
 
 	if (!oh)
-		return -EINVAL;
+		return;
+
+	oh->_int_flags |= _HWMOD_NO_MPU_PORT;
 
 	while (i < oh->slaves_cnt) {
 		os = _fetch_next_ocp_if(NULL, oh->slaves, &i);
 		if (os->user & OCP_USER_MPU) {
-			found = 1;
+			oh->_mpu_port_index = i - 1;
+			oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
 			break;
 		}
 	}
 
-	if (found)
-		pr_debug("omap_hwmod: %s: MPU OCP slave port ID  %d\n",
-			 oh->name, i - 1);
-	else
-		pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
-			 oh->name);
-
-	return (found) ? (i - 1) : -EINVAL;
+	return;
 }
 
 /**
@@ -1076,7 +1073,7 @@ static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap
 	int found = 0, i = 0;
 
 	os = _find_mpu_rt_port(oh);
-	if (!os->addr)
+	if (!os || !os->addr)
 		return NULL;
 
 	do {
@@ -2213,8 +2210,6 @@ static int __init _setup(struct omap_hwmod *oh, void *data)
  */
 static int __init _register(struct omap_hwmod *oh)
 {
-	int ms_id;
-
 	if (!oh || !oh->name || !oh->class || !oh->class->name ||
 	    (oh->_state != _HWMOD_STATE_UNKNOWN))
 		return -EINVAL;
@@ -2224,11 +2219,7 @@ static int __init _register(struct omap_hwmod *oh)
 	if (_lookup(oh->name))
 		return -EEXIST;
 
-	ms_id = _find_mpu_port_index(oh);
-	if (!IS_ERR_VALUE(ms_id))
-		oh->_mpu_port_index = ms_id;
-	else
-		oh->_int_flags |= _HWMOD_NO_MPU_PORT;
+	_save_mpu_port_index(oh);
 
 	list_add_tail(&oh->node, &omap_hwmod_list);