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networking: make skb_put & friends return void pointers

Browse source 
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions (skb_put, __skb_put and pskb_put) return void *
and remove all the casts across the tree, adding a (u8 *) cast only
where the unsigned char pointer was used directly, all done with the
following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_put, __skb_put };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_put, __skb_put };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

which actually doesn't cover pskb_put since there are only three
users overall.

A handful of stragglers were converted manually, notably a macro in
drivers/isdn/i4l/isdn_bsdcomp.c and, oddly enough, one of the many
instances in net/bluetooth/hci_sock.c. In the former file, I also
had to fix one whitespace problem spatch introduced.

Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Johannes Berg 2017-06-16 14:29:21 +02:00 • committed by David S. Miller
commit 4df864c1d9
145 changed files with 486 additions and 547 deletions
Download patch file Download diff file Expand all files Collapse all files

2
net/bluetooth/hci_request.c
View file

@ -299,7 +299,7 @@ struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen,
if (!skb)
return NULL;
hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE);
hdr = skb_put(skb, HCI_COMMAND_HDR_SIZE);
hdr->opcode = cpu_to_le16(opcode);
hdr->plen = plen;

12
net/bluetooth/hci_sock.c
View file

@ -410,7 +410,7 @@ static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
if (!skb)
return NULL;
ni = (void *)skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
ni->type = hdev->dev_type;
ni->bus = hdev->bus;
bacpy(&ni->bdaddr, &hdev->bdaddr);
@ -438,7 +438,7 @@ static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
if (!skb)
return NULL;
ii = (void *)skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
bacpy(&ii->bdaddr, &hdev->bdaddr);
ii->manufacturer = cpu_to_le16(hdev->manufacturer);
@ -517,7 +517,7 @@ static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
put_unaligned_le16(format, skb_put(skb, 2));
skb_put_data(skb, ver, sizeof(ver));
put_unaligned_le32(flags, skb_put(skb, 4));
*skb_put(skb, 1) = TASK_COMM_LEN;
*(u8 *)skb_put(skb, 1) = TASK_COMM_LEN;
skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
__net_timestamp(skb);
@ -616,7 +616,7 @@ send_monitor_note(struct sock *sk, const char *fmt, ...)
va_start(args, fmt);
vsprintf(skb_put(skb, len), fmt, args);
*skb_put(skb, 1) = 0;
*(u8 *)skb_put(skb, 1) = 0;
va_end(args);
__net_timestamp(skb);
@ -703,11 +703,11 @@ static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
if (!skb)
return;
hdr = (void *)skb_put(skb, HCI_EVENT_HDR_SIZE);
hdr = skb_put(skb, HCI_EVENT_HDR_SIZE);
hdr->evt = HCI_EV_STACK_INTERNAL;
hdr->plen = sizeof(*ev) + dlen;
ev = (void *)skb_put(skb, sizeof(*ev) + dlen);
ev = skb_put(skb, sizeof(*ev) + dlen);
ev->type = type;
memcpy(ev->data, data, dlen);

2
net/bluetooth/hidp/core.c
View file

@ -112,7 +112,7 @@ static int hidp_send_message(struct hidp_session *session, struct socket *sock,
return -ENOMEM;
}
*skb_put(skb, 1) = hdr;
*(u8 *)skb_put(skb, 1) = hdr;
if (data && size > 0)
skb_put_data(skb, data, size);

14
net/bluetooth/l2cap_core.c
View file

@ -1048,7 +1048,7 @@ static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
if (!skb)
return ERR_PTR(-ENOMEM);
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(chan->dcid);
@ -2182,7 +2182,7 @@ static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
return skb;
/* Create L2CAP header */
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(chan->dcid);
lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
@ -2213,7 +2213,7 @@ static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
return skb;
/* Create L2CAP header */
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(chan->dcid);
lh->len = cpu_to_le16(len);
@ -2255,7 +2255,7 @@ static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
return skb;
/* Create L2CAP header */
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(chan->dcid);
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
@ -2373,7 +2373,7 @@ static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
return skb;
/* Create L2CAP header */
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(chan->dcid);
lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
@ -2908,7 +2908,7 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
if (!skb)
return NULL;
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh = skb_put(skb, L2CAP_HDR_SIZE);
lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
if (conn->hcon->type == LE_LINK)
@ -2916,7 +2916,7 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
else
lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
cmd = skb_put(skb, L2CAP_CMD_HDR_SIZE);
cmd->code = code;
cmd->ident = ident;
cmd->len = cpu_to_le16(dlen);

10
net/bluetooth/mgmt_util.c
View file

@ -66,7 +66,7 @@ int mgmt_send_event(u16 event, struct hci_dev *hdev, unsigned short channel,
if (!skb)
return -ENOMEM;
hdr = (void *) skb_put(skb, sizeof(*hdr));
hdr = skb_put(skb, sizeof(*hdr));
hdr->opcode = cpu_to_le16(event);
if (hdev)
hdr->index = cpu_to_le16(hdev->id);
@ -103,13 +103,13 @@ int mgmt_cmd_status(struct sock *sk, u16 index, u16 cmd, u8 status)
if (!skb)
return -ENOMEM;
hdr = (void *) skb_put(skb, sizeof(*hdr));
hdr = skb_put(skb, sizeof(*hdr));
hdr->opcode = cpu_to_le16(MGMT_EV_CMD_STATUS);
hdr->index = cpu_to_le16(index);
hdr->len = cpu_to_le16(sizeof(*ev));
ev = (void *) skb_put(skb, sizeof(*ev));
ev = skb_put(skb, sizeof(*ev));
ev->status = status;
ev->opcode = cpu_to_le16(cmd);
@ -147,13 +147,13 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
if (!skb)
return -ENOMEM;
hdr = (void *) skb_put(skb, sizeof(*hdr));
hdr = skb_put(skb, sizeof(*hdr));
hdr->opcode = cpu_to_le16(MGMT_EV_CMD_COMPLETE);
hdr->index = cpu_to_le16(index);
hdr->len = cpu_to_le16(sizeof(*ev) + rp_len);
ev = (void *) skb_put(skb, sizeof(*ev) + rp_len);
ev = skb_put(skb, sizeof(*ev) + rp_len);
ev->opcode = cpu_to_le16(cmd);
ev->status = status;

2
net/bluetooth/rfcomm/core.c
View file

@ -863,7 +863,7 @@ static int rfcomm_queue_disc(struct rfcomm_dlc *d)
if (!skb)
return -ENOMEM;
cmd = (void *) __skb_put(skb, sizeof(*cmd));
cmd = __skb_put(skb, sizeof(*cmd));
cmd->addr = d->addr;
cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
cmd->len = __len8(0);