[BLUETOOTH]: Introduce skb->data accessor methods for hci_{acl,event,sco}_hdr

For consistency with other skb data accessors, reducing the number of direct
accesses to skb->data.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

drivers/bluetooth/bluecard_cs.c

@@ -461,20 +461,20 @@ static void bluecard_receive(bluecard_info_t *info, unsigned int offset)
 				switch (info->rx_state) {
 
 				case RECV_WAIT_EVENT_HEADER:
-					eh = (struct hci_event_hdr *)(info->rx_skb->data);
+					eh = hci_event_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = eh->plen;
 					break;
 
 				case RECV_WAIT_ACL_HEADER:
-					ah = (struct hci_acl_hdr *)(info->rx_skb->data);
+					ah = hci_acl_hdr(info->rx_skb);
 					dlen = __le16_to_cpu(ah->dlen);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = dlen;
 					break;
 
 				case RECV_WAIT_SCO_HEADER:
-					sh = (struct hci_sco_hdr *)(info->rx_skb->data);
+					sh = hci_sco_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = sh->dlen;
 					break;

drivers/bluetooth/bt3c_cs.c

@@ -303,20 +303,20 @@ static void bt3c_receive(bt3c_info_t *info)
 				switch (info->rx_state) {
 
 				case RECV_WAIT_EVENT_HEADER:
-					eh = (struct hci_event_hdr *)(info->rx_skb->data);
+					eh = hci_event_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = eh->plen;
 					break;
 
 				case RECV_WAIT_ACL_HEADER:
-					ah = (struct hci_acl_hdr *)(info->rx_skb->data);
+					ah = hci_acl_hdr(info->rx_skb);
 					dlen = __le16_to_cpu(ah->dlen);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = dlen;
 					break;
 
 				case RECV_WAIT_SCO_HEADER:
-					sh = (struct hci_sco_hdr *)(info->rx_skb->data);
+					sh = hci_sco_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = sh->dlen;
 					break;

drivers/bluetooth/btuart_cs.c

@@ -250,20 +250,20 @@ static void btuart_receive(btuart_info_t *info)
 				switch (info->rx_state) {
 
 				case RECV_WAIT_EVENT_HEADER:
-					eh = (struct hci_event_hdr *)(info->rx_skb->data);
+					eh = hci_event_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = eh->plen;
 					break;
 
 				case RECV_WAIT_ACL_HEADER:
-					ah = (struct hci_acl_hdr *)(info->rx_skb->data);
+					ah = hci_acl_hdr(info->rx_skb);
 					dlen = __le16_to_cpu(ah->dlen);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = dlen;
 					break;
 
 				case RECV_WAIT_SCO_HEADER:
-					sh = (struct hci_sco_hdr *)(info->rx_skb->data);
+					sh = hci_sco_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = sh->dlen;
 					break;

drivers/bluetooth/hci_h4.c

@@ -188,7 +188,7 @@ static int h4_recv(struct hci_uart *hu, void *data, int count)
 				continue;
 
 			case H4_W4_EVENT_HDR:
-				eh = (struct hci_event_hdr *) h4->rx_skb->data;
+				eh = hci_event_hdr(h4->rx_skb);
 
 				BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
 
@@ -196,7 +196,7 @@ static int h4_recv(struct hci_uart *hu, void *data, int count)
 				continue;
 
 			case H4_W4_ACL_HDR:
-				ah = (struct hci_acl_hdr *) h4->rx_skb->data;
+				ah = hci_acl_hdr(h4->rx_skb);
 				dlen = __le16_to_cpu(ah->dlen);
 
 				BT_DBG("ACL header: dlen %d", dlen);
@@ -205,7 +205,7 @@ static int h4_recv(struct hci_uart *hu, void *data, int count)
 				continue;
 
 			case H4_W4_SCO_HDR:
-				sh = (struct hci_sco_hdr *) h4->rx_skb->data;
+				sh = hci_sco_hdr(h4->rx_skb);
 
 				BT_DBG("SCO header: dlen %d", sh->dlen);
 

include/net/bluetooth/hci.h

@@ -709,6 +709,24 @@ struct hci_sco_hdr {
 	__u8 	dlen;
 } __attribute__ ((packed));
 
+#ifdef __KERNEL__
+#include <linux/skbuff.h>
+static inline struct hci_event_hdr *hci_event_hdr(const struct sk_buff *skb)
+{
+	return (struct hci_event_hdr *)skb->data;
+}
+
+static inline struct hci_acl_hdr *hci_acl_hdr(const struct sk_buff *skb)
+{
+	return (struct hci_acl_hdr *)skb->data;
+}
+
+static inline struct hci_sco_hdr *hci_sco_hdr(const struct sk_buff *skb)
+{
+	return (struct hci_sco_hdr *)skb->data;
+}
+#endif
+
 /* Command opcode pack/unpack */
 #define hci_opcode_pack(ogf, ocf)	(__u16) ((ocf & 0x03ff)|(ogf << 10))
 #define hci_opcode_ogf(op)		(op >> 10)