NFC: NCI: Fix skb->dev usage

skb->dev is used for carrying a net_device pointer and not
an nci_dev pointer.

Remove usage of skb-dev to carry nci_dev and replace it by parameter
in nci_recv_frame(), nci_send_frame() and driver send() functions.

NfcWilink driver is also updated to use those functions.
Signed-off-by: NFrederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/nfc/nfcwilink.c

@@ -109,7 +109,7 @@ enum {
 	NFCWILINK_FW_DOWNLOAD,
 };
 
-static int nfcwilink_send(struct sk_buff *skb);
+static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb);
 
 static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
 {
@@ -156,8 +156,6 @@ static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
 		return -ENOMEM;
 	}
 
-	skb->dev = (void *)drv->ndev;
-
 	cmd = (struct nci_vs_nfcc_info_cmd *)
 			skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
 	cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
@@ -166,7 +164,7 @@ static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
 
 	drv->nfcc_info.plen = 0;
 
-	rc = nfcwilink_send(skb);
+	rc = nfcwilink_send(drv->ndev, skb);
 	if (rc)
 		return rc;
 
@@ -232,11 +230,9 @@ static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
 		return -ENOMEM;
 	}
 
-	skb->dev = (void *)drv->ndev;
-
 	memcpy(skb_put(skb, len), data, len);
 
-	rc = nfcwilink_send(skb);
+	rc = nfcwilink_send(drv->ndev, skb);
 	if (rc)
 		return rc;
 
@@ -371,10 +367,8 @@ static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
 		return 0;
 	}
 
-	skb->dev = (void *) drv->ndev;
-
 	/* Forward skb to NCI core layer */
-	rc = nci_recv_frame(skb);
+	rc = nci_recv_frame(drv->ndev, skb);
 	if (rc < 0) {
 		nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
 		return rc;
@@ -480,9 +474,8 @@ static int nfcwilink_close(struct nci_dev *ndev)
 	return rc;
 }
 
-static int nfcwilink_send(struct sk_buff *skb)
+static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb)
 {
-	struct nci_dev *ndev = (struct nci_dev *)skb->dev;
 	struct nfcwilink *drv = nci_get_drvdata(ndev);
 	struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
 	long len;

include/net/nfc/nci_core.h

@@ -66,7 +66,7 @@ struct nci_dev;
 struct nci_ops {
 	int (*open)(struct nci_dev *ndev);
 	int (*close)(struct nci_dev *ndev);
-	int (*send)(struct sk_buff *skb);
+	int (*send)(struct nci_dev *ndev, struct sk_buff *skb);
 };
 
 #define NCI_MAX_SUPPORTED_RF_INTERFACES		4
@@ -153,7 +153,7 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 void nci_free_device(struct nci_dev *ndev);
 int nci_register_device(struct nci_dev *ndev);
 void nci_unregister_device(struct nci_dev *ndev);
-int nci_recv_frame(struct sk_buff *skb);
+int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb);
 
 static inline struct sk_buff *nci_skb_alloc(struct nci_dev *ndev,
 					    unsigned int len,

net/nfc/nci/core.c

@@ -797,12 +797,11 @@ EXPORT_SYMBOL(nci_unregister_device);
 /**
  * nci_recv_frame - receive frame from NCI drivers
  *
+ * @ndev: The nci device
  * @skb: The sk_buff to receive
  */
-int nci_recv_frame(struct sk_buff *skb)
+int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
 {
-	struct nci_dev *ndev = (struct nci_dev *) skb->dev;
-
 	pr_debug("len %d\n", skb->len);
 
 	if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
@@ -819,10 +818,8 @@ int nci_recv_frame(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(nci_recv_frame);
 
-static int nci_send_frame(struct sk_buff *skb)
+static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
 {
-	struct nci_dev *ndev = (struct nci_dev *) skb->dev;
-
 	pr_debug("len %d\n", skb->len);
 
 	if (!ndev) {
@@ -833,7 +830,7 @@ static int nci_send_frame(struct sk_buff *skb)
 	/* Get rid of skb owner, prior to sending to the driver. */
 	skb_orphan(skb);
 
-	return ndev->ops->send(skb);
+	return ndev->ops->send(ndev, skb);
 }
 
 /* Send NCI command */
@@ -861,8 +858,6 @@ int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
 	if (plen)
 		memcpy(skb_put(skb, plen), payload, plen);
 
-	skb->dev = (void *) ndev;
-
 	skb_queue_tail(&ndev->cmd_q, skb);
 	queue_work(ndev->cmd_wq, &ndev->cmd_work);
 
@@ -894,7 +889,7 @@ static void nci_tx_work(struct work_struct *work)
 			 nci_conn_id(skb->data),
 			 nci_plen(skb->data));
 
-		nci_send_frame(skb);
+		nci_send_frame(ndev, skb);
 
 		mod_timer(&ndev->data_timer,
 			  jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
@@ -963,7 +958,7 @@ static void nci_cmd_work(struct work_struct *work)
 			 nci_opcode_oid(nci_opcode(skb->data)),
 			 nci_plen(skb->data));
 
-		nci_send_frame(skb);
+		nci_send_frame(ndev, skb);
 
 		mod_timer(&ndev->cmd_timer,
 			  jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));

net/nfc/nci/data.c

@@ -80,8 +80,6 @@ static inline void nci_push_data_hdr(struct nci_dev *ndev,
 
 	nci_mt_set((__u8 *)hdr, NCI_MT_DATA_PKT);
 	nci_pbf_set((__u8 *)hdr, pbf);
-
-	skb->dev = (void *) ndev;
 }
 
 static int nci_queue_tx_data_frags(struct nci_dev *ndev,