[PATCH v5 2/3] extcon: Add extcon_alloc_muex to simplify extcon register function

[Bumwoo Lee <bw365.lee@samsung.com>]

The mutual exclusive part is functionalized from extcon_dev_register.

Signed-off-by: Bumwoo Lee <bw365.lee@samsung.com>
---
 drivers/extcon/extcon.c | 109 ++++++++++++++++++++++------------------
 1 file changed, 61 insertions(+), 48 deletions(-)

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 402d674e2896..86290afa35fb 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -1130,6 +1130,63 @@ static int extcon_alloc_cables(struct extcon_dev *edev)
 	return 0;
 }
 
+/**
+ * extcon_alloc_muex() - alloc the mutual exclusive for extcon device
+ * @edev:	extcon device
+ *
+ * Returns 0 if success or error number if fail.
+ */
+static int extcon_alloc_muex(struct extcon_dev *edev)
+{
+	char *name;
+	int index;
+
+	if (!edev)
+		return -EINVAL;
+
+	if (!(edev->max_supported && edev->mutually_exclusive))
+		return 0;
+
+	/* Count the size of mutually_exclusive array */
+	for (index = 0; edev->mutually_exclusive[index]; index++)
+		;
+
+	edev->attrs_muex = kcalloc(index + 1,
+				   sizeof(struct attribute *),
+				   GFP_KERNEL);
+	if (!edev->attrs_muex)
+		return -ENOMEM;
+
+	edev->d_attrs_muex = kcalloc(index,
+				     sizeof(struct device_attribute),
+				     GFP_KERNEL);
+	if (!edev->d_attrs_muex) {
+		kfree(edev->attrs_muex);
+		return -ENOMEM;
+	}
+
+	for (index = 0; edev->mutually_exclusive[index]; index++) {
+		name = kasprintf(GFP_KERNEL, "0x%x",
+				 edev->mutually_exclusive[index]);
+		if (!name) {
+			for (index--; index >= 0; index--)
+				kfree(edev->d_attrs_muex[index].attr.name);
+
+			kfree(edev->d_attrs_muex);
+			kfree(edev->attrs_muex);
+			return -ENOMEM;
+		}
+		sysfs_attr_init(&edev->d_attrs_muex[index].attr);
+		edev->d_attrs_muex[index].attr.name = name;
+		edev->d_attrs_muex[index].attr.mode = 0000;
+		edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr;
+	}
+	edev->attr_g_muex.name = muex_name;
+	edev->attr_g_muex.attrs = edev->attrs_muex;
+
+	return 0;
+}
+
 /**
  * extcon_dev_register() - Register an new extcon device
  * @edev:	the extcon device to be registered
@@ -1181,53 +1238,9 @@ int extcon_dev_register(struct extcon_dev *edev)
 	if (ret < 0)
 		goto err_alloc_cables;
 
-	if (edev->max_supported && edev->mutually_exclusive) {
-		char *name;
-
-		/* Count the size of mutually_exclusive array */
-		for (index = 0; edev->mutually_exclusive[index]; index++)
-			;
-
-		edev->attrs_muex = kcalloc(index + 1,
-					   sizeof(struct attribute *),
-					   GFP_KERNEL);
-		if (!edev->attrs_muex) {
-			ret = -ENOMEM;
-			goto err_muex;
-		}
-
-		edev->d_attrs_muex = kcalloc(index,
-					     sizeof(struct device_attribute),
-					     GFP_KERNEL);
-		if (!edev->d_attrs_muex) {
-			ret = -ENOMEM;
-			kfree(edev->attrs_muex);
-			goto err_muex;
-		}
-
-		for (index = 0; edev->mutually_exclusive[index]; index++) {
-			name = kasprintf(GFP_KERNEL, "0x%x",
-					 edev->mutually_exclusive[index]);
-			if (!name) {
-				for (index--; index >= 0; index--) {
-					kfree(edev->d_attrs_muex[index].attr.
-					      name);
-				}
-				kfree(edev->d_attrs_muex);
-				kfree(edev->attrs_muex);
-				ret = -ENOMEM;
-				goto err_muex;
-			}
-			sysfs_attr_init(&edev->d_attrs_muex[index].attr);
-			edev->d_attrs_muex[index].attr.name = name;
-			edev->d_attrs_muex[index].attr.mode = 0000;
-			edev->attrs_muex[index] = &edev->d_attrs_muex[index]
-							.attr;
-		}
-		edev->attr_g_muex.name = muex_name;
-		edev->attr_g_muex.attrs = edev->attrs_muex;
-
-	}
+	ret = extcon_alloc_muex(edev);
+	if (ret < 0)
+		goto err_alloc_muex;
 
 	if (edev->max_supported) {
 		edev->extcon_dev_type.groups =
@@ -1295,7 +1308,7 @@ int extcon_dev_register(struct extcon_dev *edev)
 		kfree(edev->d_attrs_muex);
 		kfree(edev->attrs_muex);
 	}
-err_muex:
+err_alloc_muex:
 	for (index = 0; index < edev->max_supported; index++)
 		kfree(edev->cables[index].attr_g.name);
 	if (edev->max_supported)
-- 
2.35.1