Bluetooth: Add define for the maximum name length on HCI level

This patch adds a clear define for the maximum device name length in HCI
messages and thereby avoids magic numbers in the code.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci.h

@@ -535,15 +535,17 @@ struct hci_cp_delete_stored_link_key {
 	__u8     delete_all;
 } __packed;
 
+#define HCI_MAX_NAME_LENGTH		248
+
 #define HCI_OP_WRITE_LOCAL_NAME		0x0c13
 struct hci_cp_write_local_name {
-	__u8     name[248];
+	__u8     name[HCI_MAX_NAME_LENGTH];
 } __packed;
 
 #define HCI_OP_READ_LOCAL_NAME		0x0c14
 struct hci_rp_read_local_name {
 	__u8     status;
-	__u8     name[248];
+	__u8     name[HCI_MAX_NAME_LENGTH];
 } __packed;
 
 #define HCI_OP_WRITE_CA_TIMEOUT		0x0c16
@@ -745,7 +747,7 @@ struct hci_ev_auth_complete {
 struct hci_ev_remote_name {
 	__u8     status;
 	bdaddr_t bdaddr;
-	__u8     name[248];
+	__u8     name[HCI_MAX_NAME_LENGTH];
 } __packed;
 
 #define HCI_EV_ENCRYPT_CHANGE		0x08

include/net/bluetooth/hci_core.h

@@ -94,7 +94,7 @@ struct hci_dev {
 	__u8		bus;
 	__u8		dev_type;
 	bdaddr_t	bdaddr;
-	__u8		dev_name[248];
+	__u8		dev_name[HCI_MAX_NAME_LENGTH];
 	__u8		dev_class[3];
 	__u8		major_class;
 	__u8		minor_class;

net/bluetooth/hci_event.c

@@ -200,7 +200,7 @@ static void hci_cc_write_local_name(struct hci_dev *hdev, struct sk_buff *skb)
 	if (!sent)
 		return;
 
-	memcpy(hdev->dev_name, sent, 248);
+	memcpy(hdev->dev_name, sent, HCI_MAX_NAME_LENGTH);
 }
 
 static void hci_cc_read_local_name(struct hci_dev *hdev, struct sk_buff *skb)
@@ -212,7 +212,7 @@ static void hci_cc_read_local_name(struct hci_dev *hdev, struct sk_buff *skb)
 	if (rp->status)
 		return;
 
-	memcpy(hdev->dev_name, rp->name, 248);
+	memcpy(hdev->dev_name, rp->name, HCI_MAX_NAME_LENGTH);
 }
 
 static void hci_cc_write_auth_enable(struct hci_dev *hdev, struct sk_buff *skb)

net/bluetooth/hci_sysfs.c

@@ -216,13 +216,13 @@ static ssize_t show_type(struct device *dev, struct device_attribute *attr, char
 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
-	char name[249];
+	char name[HCI_MAX_NAME_LENGTH + 1];
 	int i;
 
-	for (i = 0; i < 248; i++)
+	for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 		name[i] = hdev->dev_name[i];
 
-	name[248] = '\0';
+	name[HCI_MAX_NAME_LENGTH] = '\0';
 	return sprintf(buf, "%s\n", name);
 }