Bluetooth: Fix doing some useless casts when receiving MGMT commands

Every command handler of mgmt does a cast to the command structure
so it can properly interpreted. So we can avoid that cast if we
make those functions receive a void * directly.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 83 insertions, 122 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 00ab083749eb..ad8986276848 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -611,15 +611,13 @@ static int send_settings_rsp(struct sock *sk, u16 opcode, struct hci_dev *hdev)
         return cmd_complete(sk, hdev->id, opcode, &settings, sizeof(settings));
 }
 
-static int set_powered(struct sock *sk, u16 index, unsigned char *data, u16 len)
+static int set_powered(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_mode *cp;
+        struct mgmt_mode *cp = data;
         struct hci_dev *hdev;
         struct pending_cmd *cmd;
         int err, up;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -664,17 +662,14 @@ failed:
         return err;
 }
 
-static int set_discoverable(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int set_discoverable(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_cp_set_discoverable *cp;
+        struct mgmt_cp_set_discoverable *cp = data;
         struct hci_dev *hdev;
         struct pending_cmd *cmd;
         u8 scan;
         int err;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -734,17 +729,14 @@ failed:
         return err;
 }
 
-static int set_connectable(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int set_connectable(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_mode *cp;
+        struct mgmt_mode *cp = data;
         struct hci_dev *hdev;
         struct pending_cmd *cmd;
         u8 scan;
         int err;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -827,16 +819,13 @@ static int mgmt_event(u16 event, struct hci_dev *hdev, void *data,
         return 0;
 }
 
-static int set_pairable(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int set_pairable(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_mode *cp;
+        struct mgmt_mode *cp = data;
         struct hci_dev *hdev;
         __le32 ev;
         int err;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -870,15 +859,13 @@ failed:
         return err;
 }
 
-static int add_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len)
+static int add_uuid(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_cp_add_uuid *cp;
+        struct mgmt_cp_add_uuid *cp = data;
         struct hci_dev *hdev;
         struct bt_uuid *uuid;
         int err;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -920,16 +907,14 @@ failed:
         return err;
 }
 
-static int remove_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len)
+static int remove_uuid(struct sock *sk, u16 index, void *data, u16 len)
 {
+        struct mgmt_cp_remove_uuid *cp = data;
         struct list_head *p, *n;
-        struct mgmt_cp_remove_uuid *cp;
         struct hci_dev *hdev;
         u8 bt_uuid_any[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
         int err, found;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -983,15 +968,12 @@ unlock:
         return err;
 }
 
-static int set_dev_class(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int set_dev_class(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_set_dev_class *cp;
+        struct mgmt_cp_set_dev_class *cp = data;
         int err;
 
-        cp = (void *) data;
-
         BT_DBG("request for hci%u", index);
 
         if (len != sizeof(*cp))
@@ -1026,16 +1008,13 @@ static int set_dev_class(struct sock *sk, u16 index, unsigned char *data,
         return err;
 }
 
-static int load_link_keys(struct sock *sk, u16 index, unsigned char *data,
-                                                                u16 len)
+static int load_link_keys(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_load_link_keys *cp;
+        struct mgmt_cp_load_link_keys *cp = data;
         u16 key_count, expected_len;
         int i;
 
-        cp = (void *) data;
-
         if (len < sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_LOAD_LINK_KEYS,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1085,19 +1064,16 @@ static int load_link_keys(struct sock *sk, u16 index, unsigned char *data,
         return 0;
 }
 
-static int remove_keys(struct sock *sk, u16 index, unsigned char *data,
-                                                                u16 len)
+static int remove_keys(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_remove_keys *cp;
+        struct mgmt_cp_remove_keys *cp = data;
         struct mgmt_rp_remove_keys rp;
         struct hci_cp_disconnect dc;
         struct pending_cmd *cmd;
         struct hci_conn *conn;
         int err;
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_REMOVE_KEYS,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1154,10 +1130,10 @@ unlock:
         return err;
 }
 
-static int disconnect(struct sock *sk, u16 index, unsigned char *data, u16 len)
+static int disconnect(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_disconnect *cp;
+        struct mgmt_cp_disconnect *cp = data;
         struct hci_cp_disconnect dc;
         struct pending_cmd *cmd;
         struct hci_conn *conn;
@@ -1165,8 +1141,6 @@ static int disconnect(struct sock *sk, u16 index, unsigned char *data, u16 len)
 
         BT_DBG("");
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_DISCONNECT,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1314,12 +1288,11 @@ static int send_pin_code_neg_reply(struct sock *sk, u16 index,
         return err;
 }
 
-static int pin_code_reply(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int pin_code_reply(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
         struct hci_conn *conn;
-        struct mgmt_cp_pin_code_reply *cp;
+        struct mgmt_cp_pin_code_reply *cp = data;
         struct mgmt_cp_pin_code_neg_reply ncp;
         struct hci_cp_pin_code_reply reply;
         struct pending_cmd *cmd;
@@ -1327,8 +1300,6 @@ static int pin_code_reply(struct sock *sk, u16 index, unsigned char *data,
 
         BT_DBG("");
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_PIN_CODE_REPLY,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1366,7 +1337,8 @@ static int pin_code_reply(struct sock *sk, u16 index, unsigned char *data,
                 goto failed;
         }
 
-        cmd = mgmt_pending_add(sk, MGMT_OP_PIN_CODE_REPLY, hdev, data, len);
+        cmd = mgmt_pending_add(sk, MGMT_OP_PIN_CODE_REPLY, hdev, data,
+                                                                        len);
         if (!cmd) {
                 err = -ENOMEM;
                 goto failed;
@@ -1387,17 +1359,14 @@ failed:
         return err;
 }
 
-static int pin_code_neg_reply(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int pin_code_neg_reply(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_pin_code_neg_reply *cp;
+        struct mgmt_cp_pin_code_neg_reply *cp = data;
         int err;
 
         BT_DBG("");
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_PIN_CODE_NEG_REPLY,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1424,16 +1393,13 @@ failed:
         return err;
 }
 
-static int set_io_capability(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int set_io_capability(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_set_io_capability *cp;
+        struct mgmt_cp_set_io_capability *cp = data;
 
         BT_DBG("");
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_SET_IO_CAPABILITY,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1508,10 +1474,10 @@ static void pairing_complete_cb(struct hci_conn *conn, u8 status)
                 pairing_complete(cmd, status);
 }
 
-static int pair_device(struct sock *sk, u16 index, unsigned char *data, u16 len)
+static int pair_device(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_pair_device *cp;
+        struct mgmt_cp_pair_device *cp = data;
         struct mgmt_rp_pair_device rp;
         struct pending_cmd *cmd;
         u8 sec_level, auth_type;
@@ -1520,8 +1486,6 @@ static int pair_device(struct sock *sk, u16 index, unsigned char *data, u16 len)
 
         BT_DBG("");
 
-        cp = (void *) data;
-
         if (len != sizeof(*cp))
                 return cmd_status(sk, index, MGMT_OP_PAIR_DEVICE,
                                                 MGMT_STATUS_INVALID_PARAMS);
@@ -1721,7 +1685,7 @@ done:
 
 static int user_confirm_reply(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_cp_user_confirm_reply *cp = (void *) data;
+        struct mgmt_cp_user_confirm_reply *cp = data;
 
         BT_DBG("");
 
@@ -1752,7 +1716,7 @@ static int user_confirm_neg_reply(struct sock *sk, u16 index, void *data,
 
 static int user_passkey_reply(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_cp_user_passkey_reply *cp = (void *) data;
+        struct mgmt_cp_user_passkey_reply *cp = data;
 
         BT_DBG("");
 
@@ -1768,7 +1732,7 @@ static int user_passkey_reply(struct sock *sk, u16 index, void *data, u16 len)
 static int user_passkey_neg_reply(struct sock *sk, u16 index, void *data,
                                                                         u16 len)
 {
-        struct mgmt_cp_user_passkey_neg_reply *cp = (void *) data;
+        struct mgmt_cp_user_passkey_neg_reply *cp = data;
 
         BT_DBG("");
 
@@ -1781,10 +1745,10 @@ static int user_passkey_neg_reply(struct sock *sk, u16 index, void *data,
                         HCI_OP_USER_PASSKEY_NEG_REPLY, 0);
 }
 
-static int set_local_name(struct sock *sk, u16 index, unsigned char *data,
+static int set_local_name(struct sock *sk, u16 index, void *data,
                                                                 u16 len)
 {
-        struct mgmt_cp_set_local_name *mgmt_cp = (void *) data;
+        struct mgmt_cp_set_local_name *mgmt_cp = data;
         struct hci_cp_write_local_name hci_cp;
         struct hci_dev *hdev;
         struct pending_cmd *cmd;
@@ -1803,7 +1767,8 @@ static int set_local_name(struct sock *sk, u16 index, unsigned char *data,
 
         hci_dev_lock(hdev);
 
-        cmd = mgmt_pending_add(sk, MGMT_OP_SET_LOCAL_NAME, hdev, data, len);
+        cmd = mgmt_pending_add(sk, MGMT_OP_SET_LOCAL_NAME, hdev, data,
+                                                                        len);
         if (!cmd) {
                 err = -ENOMEM;
                 goto failed;
@@ -1872,11 +1837,11 @@ unlock:
         return err;
 }
 
-static int add_remote_oob_data(struct sock *sk, u16 index, unsigned char *data,
-                                                                        u16 len)
+static int add_remote_oob_data(struct sock *sk, u16 index, void *data,
+                                                                u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_add_remote_oob_data *cp = (void *) data;
+        struct mgmt_cp_add_remote_oob_data *cp = data;
         int err;
 
         BT_DBG("hci%u ", index);
@@ -1908,10 +1873,10 @@ static int add_remote_oob_data(struct sock *sk, u16 index, unsigned char *data,
 }
 
 static int remove_remote_oob_data(struct sock *sk, u16 index,
-                                                unsigned char *data, u16 len)
+                                                void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_remove_remote_oob_data *cp = (void *) data;
+        struct mgmt_cp_remove_remote_oob_data *cp = data;
         int err;
 
         BT_DBG("hci%u ", index);
@@ -1942,9 +1907,9 @@ static int remove_remote_oob_data(struct sock *sk, u16 index,
 }
 
 static int start_discovery(struct sock *sk, u16 index,
-                                                unsigned char *data, u16 len)
+                                                void *data, u16 len)
 {
-        struct mgmt_cp_start_discovery *cp = (void *) data;
+        struct mgmt_cp_start_discovery *cp = data;
         struct pending_cmd *cmd;
         struct hci_dev *hdev;
         int err;
@@ -2054,10 +2019,9 @@ unlock:
         return err;
 }
 
-static int confirm_name(struct sock *sk, u16 index, unsigned char *data,
-                                                                u16 len)
+static int confirm_name(struct sock *sk, u16 index, void *data, u16 len)
 {
-        struct mgmt_cp_confirm_name *cp = (void *) data;
+        struct mgmt_cp_confirm_name *cp = data;
         struct inquiry_entry *e;
         struct hci_dev *hdev;
         int err;
@@ -2104,11 +2068,10 @@ failed:
         return err;
 }
 
-static int block_device(struct sock *sk, u16 index, unsigned char *data,
-                                                                u16 len)
+static int block_device(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_block_device *cp = (void *) data;
+        struct mgmt_cp_block_device *cp = data;
         int err;
 
         BT_DBG("hci%u", index);
@@ -2138,11 +2101,10 @@ static int block_device(struct sock *sk, u16 index, unsigned char *data,
         return err;
 }
 
-static int unblock_device(struct sock *sk, u16 index, unsigned char *data,
-                                                                u16 len)
+static int unblock_device(struct sock *sk, u16 index, void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_cp_unblock_device *cp = (void *) data;
+        struct mgmt_cp_unblock_device *cp = data;
         int err;
 
         BT_DBG("hci%u", index);
@@ -2174,10 +2136,10 @@ static int unblock_device(struct sock *sk, u16 index, unsigned char *data,
 }
 
 static int set_fast_connectable(struct sock *sk, u16 index,
-                                        unsigned char *data, u16 len)
+                                        void *data, u16 len)
 {
         struct hci_dev *hdev;
-        struct mgmt_mode *cp = (void *) data;
+        struct mgmt_mode *cp = data;
         struct hci_cp_write_page_scan_activity acp;
         u8 type;
         int err;
@@ -2231,7 +2193,8 @@ done:
 
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
 {
-        unsigned char *buf;
+        void *buf;
+        u8 *cp;
         struct mgmt_hdr *hdr;
         u16 opcode, index, len;
         int err;
@@ -2250,7 +2213,7 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
                 goto done;
         }
 
-        hdr = (struct mgmt_hdr *) buf;
+        hdr = buf;
         opcode = get_unaligned_le16(&hdr->opcode);
         index = get_unaligned_le16(&hdr->index);
         len = get_unaligned_le16(&hdr->len);
@@ -2260,6 +2223,8 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
                 goto done;
         }
 
+        cp = buf + sizeof(*hdr);
+
         switch (opcode) {
         case MGMT_OP_READ_VERSION:
                 err = read_version(sk);
@@ -2271,98 +2236,94 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
                 err = read_controller_info(sk, index);
                 break;
         case MGMT_OP_SET_POWERED:
-                err = set_powered(sk, index, buf + sizeof(*hdr), len);
+                err = set_powered(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_DISCOVERABLE:
-                err = set_discoverable(sk, index, buf + sizeof(*hdr), len);
+                err = set_discoverable(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_CONNECTABLE:
-                err = set_connectable(sk, index, buf + sizeof(*hdr), len);
+                err = set_connectable(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_FAST_CONNECTABLE:
-                err = set_fast_connectable(sk, index, buf + sizeof(*hdr),
-                                                                len);
+                err = set_fast_connectable(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_PAIRABLE:
-                err = set_pairable(sk, index, buf + sizeof(*hdr), len);
+                err = set_pairable(sk, index, cp, len);
                 break;
         case MGMT_OP_ADD_UUID:
-                err = add_uuid(sk, index, buf + sizeof(*hdr), len);
+                err = add_uuid(sk, index, cp, len);
                 break;
         case MGMT_OP_REMOVE_UUID:
-                err = remove_uuid(sk, index, buf + sizeof(*hdr), len);
+                err = remove_uuid(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_DEV_CLASS:
-                err = set_dev_class(sk, index, buf + sizeof(*hdr), len);
+                err = set_dev_class(sk, index, cp, len);
                 break;
         case MGMT_OP_LOAD_LINK_KEYS:
-                err = load_link_keys(sk, index, buf + sizeof(*hdr), len);
+                err = load_link_keys(sk, index, cp, len);
                 break;
         case MGMT_OP_REMOVE_KEYS:
-                err = remove_keys(sk, index, buf + sizeof(*hdr), len);
+                err = remove_keys(sk, index, cp, len);
                 break;
         case MGMT_OP_DISCONNECT:
-                err = disconnect(sk, index, buf + sizeof(*hdr), len);
+                err = disconnect(sk, index, cp, len);
                 break;
         case MGMT_OP_GET_CONNECTIONS:
                 err = get_connections(sk, index);
                 break;
         case MGMT_OP_PIN_CODE_REPLY:
-                err = pin_code_reply(sk, index, buf + sizeof(*hdr), len);
+                err = pin_code_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_PIN_CODE_NEG_REPLY:
-                err = pin_code_neg_reply(sk, index, buf + sizeof(*hdr), len);
+                err = pin_code_neg_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_IO_CAPABILITY:
-                err = set_io_capability(sk, index, buf + sizeof(*hdr), len);
+                err = set_io_capability(sk, index, cp, len);
                 break;
         case MGMT_OP_PAIR_DEVICE:
-                err = pair_device(sk, index, buf + sizeof(*hdr), len);
+                err = pair_device(sk, index, cp, len);
                 break;
         case MGMT_OP_CANCEL_PAIR_DEVICE:
                 err = cancel_pair_device(sk, index, buf + sizeof(*hdr), len);
                 break;
         case MGMT_OP_USER_CONFIRM_REPLY:
-                err = user_confirm_reply(sk, index, buf + sizeof(*hdr), len);
+                err = user_confirm_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_USER_CONFIRM_NEG_REPLY:
-                err = user_confirm_neg_reply(sk, index, buf + sizeof(*hdr),
-                                                                        len);
+                err = user_confirm_neg_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_USER_PASSKEY_REPLY:
-                err = user_passkey_reply(sk, index, buf + sizeof(*hdr), len);
+                err = user_passkey_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_USER_PASSKEY_NEG_REPLY:
-                err = user_passkey_neg_reply(sk, index, buf + sizeof(*hdr),
-                                                                        len);
+                err = user_passkey_neg_reply(sk, index, cp, len);
                 break;
         case MGMT_OP_SET_LOCAL_NAME:
-                err = set_local_name(sk, index, buf + sizeof(*hdr), len);
+                err = set_local_name(sk, index, cp, len);
                 break;
         case MGMT_OP_READ_LOCAL_OOB_DATA:
                 err = read_local_oob_data(sk, index);
                 break;
         case MGMT_OP_ADD_REMOTE_OOB_DATA:
-                err = add_remote_oob_data(sk, index, buf + sizeof(*hdr), len);
+                err = add_remote_oob_data(sk, index, cp, len);
                 break;
         case MGMT_OP_REMOVE_REMOTE_OOB_DATA:
-                err = remove_remote_oob_data(sk, index, buf + sizeof(*hdr),
-                                                                        len);
+                err = remove_remote_oob_data(sk, index, cp, len);
                 break;
         case MGMT_OP_START_DISCOVERY:
-                err = start_discovery(sk, index, buf + sizeof(*hdr), len);
+                err = start_discovery(sk, index, cp, len);
                 break;
         case MGMT_OP_STOP_DISCOVERY:
                 err = stop_discovery(sk, index);
                 break;
         case MGMT_OP_CONFIRM_NAME:
-                err = confirm_name(sk, index, buf + sizeof(*hdr), len);
+                err = confirm_name(sk, index, cp, len);
                 break;
         case MGMT_OP_BLOCK_DEVICE:
-                err = block_device(sk, index, buf + sizeof(*hdr), len);
+                err = block_device(sk, index, cp, len);
                 break;
         case MGMT_OP_UNBLOCK_DEVICE:
-                err = unblock_device(sk, index, buf + sizeof(*hdr), len);
+                err = unblock_device(sk, index, cp, len);
                 break;
         default:
                 BT_DBG("Unknown op %u", opcode);