linux-kernel - [PATCH v2 2/4] extcon: Added extcon_alloc_cables to simplify extcon register function

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Date:   Mon, 20 Feb 2023 14:45:11 +0900
From:   Bumwoo Lee <bw365.lee@...sung.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-kernel@...r.kernel.org
Cc:     Bumwoo Lee <bw365.lee@...sung.com>
Subject: [PATCH v2 2/4] extcon: Added extcon_alloc_cables to simplify extcon
 register function

The cable allocation part is functionalized from extcon_dev_register.

Signed-off-by: Bumwoo Lee <bw365.lee@...sung.com>
---
 drivers/extcon/extcon.c | 104 +++++++++++++++++++++++-----------------
 1 file changed, 59 insertions(+), 45 deletions(-)

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index adcf01132f70..3c2f540785e8 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -1070,6 +1070,61 @@ void extcon_dev_free(struct extcon_dev *edev)
 }
 EXPORT_SYMBOL_GPL(extcon_dev_free);
 
+/**
+ * extcon_alloc_cables() - alloc the cables for extcon device
+ * @edev:	extcon device which has cables
+ *
+ * Returns 0 if success or error number if fail.
+ */
+static int extcon_alloc_cables(struct extcon_dev *edev)
+{
+	int index;
+	char *str;
+	struct extcon_cable *cable;
+
+	if (!edev->max_supported)
+		return 0;
+
+	edev->cables = kcalloc(edev->max_supported,
+			       sizeof(struct extcon_cable),
+			       GFP_KERNEL);
+	if (!edev->cables)
+		return -ENOMEM;
+
+	for (index = 0; index < edev->max_supported; index++) {
+		cable = &edev->cables[index];
+
+		str = kasprintf(GFP_KERNEL, "cable.%d", index);
+		if (!str) {
+			for (index--; index >= 0; index--) {
+				cable = &edev->cables[index];
+				kfree(cable->attr_g.name);
+			}
+			return -ENOMEM;
+		}
+
+		cable->edev = edev;
+		cable->cable_index = index;
+		cable->attrs[0] = &cable->attr_name.attr;
+		cable->attrs[1] = &cable->attr_state.attr;
+		cable->attrs[2] = NULL;
+		cable->attr_g.name = str;
+		cable->attr_g.attrs = cable->attrs;
+
+		sysfs_attr_init(&cable->attr_name.attr);
+		cable->attr_name.attr.name = "name";
+		cable->attr_name.attr.mode = 0444;
+		cable->attr_name.show = cable_name_show;
+
+		sysfs_attr_init(&cable->attr_state.attr);
+		cable->attr_state.attr.name = "state";
+		cable->attr_state.attr.mode = 0444;
+		cable->attr_state.show = cable_state_show;
+	}
+
+	return 0;
+}
+
 /**
  * extcon_dev_register() - Register an new extcon device
  * @edev:	the extcon device to be registered
@@ -1117,50 +1172,9 @@ int extcon_dev_register(struct extcon_dev *edev)
 	dev_set_name(&edev->dev, "extcon%lu",
 			(unsigned long)atomic_inc_return(&edev_no));
 
-	if (edev->max_supported) {
-		char *str;
-		struct extcon_cable *cable;
-
-		edev->cables = kcalloc(edev->max_supported,
-				       sizeof(struct extcon_cable),
-				       GFP_KERNEL);
-		if (!edev->cables) {
-			ret = -ENOMEM;
-			goto err_sysfs_alloc;
-		}
-		for (index = 0; index < edev->max_supported; index++) {
-			cable = &edev->cables[index];
-
-			str = kasprintf(GFP_KERNEL, "cable.%d", index);
-			if (!str) {
-				for (index--; index >= 0; index--) {
-					cable = &edev->cables[index];
-					kfree(cable->attr_g.name);
-				}
-				ret = -ENOMEM;
-
-				goto err_alloc_cables;
-			}
-
-			cable->edev = edev;
-			cable->cable_index = index;
-			cable->attrs[0] = &cable->attr_name.attr;
-			cable->attrs[1] = &cable->attr_state.attr;
-			cable->attrs[2] = NULL;
-			cable->attr_g.name = str;
-			cable->attr_g.attrs = cable->attrs;
-
-			sysfs_attr_init(&cable->attr_name.attr);
-			cable->attr_name.attr.name = "name";
-			cable->attr_name.attr.mode = 0444;
-			cable->attr_name.show = cable_name_show;
-
-			sysfs_attr_init(&cable->attr_state.attr);
-			cable->attr_state.attr.name = "state";
-			cable->attr_state.attr.mode = 0444;
-			cable->attr_state.show = cable_state_show;
-		}
-	}
+	ret = extcon_alloc_cables(edev);
+	if (ret)
+		goto err_alloc_cables;
 
 	if (edev->max_supported && edev->mutually_exclusive) {
 		char *name;
@@ -1282,7 +1296,7 @@ int extcon_dev_register(struct extcon_dev *edev)
 err_alloc_cables:
 	if (edev->max_supported)
 		kfree(edev->cables);
-err_sysfs_alloc:
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(extcon_dev_register);
-- 
2.35.1