nfc: constify nfc_digital_ops

Neither the core nor the drivers modify the passed pointer to struct
nfc_digital_ops, so make it a pointer to const for correctness and safety.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/nfc/nfcsim.c

@@ -320,7 +320,7 @@ static int nfcsim_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
 	return nfcsim_send(ddev, NULL, timeout, cb, arg);
 }
 
-static struct nfc_digital_ops nfcsim_digital_ops = {
+static const struct nfc_digital_ops nfcsim_digital_ops = {
 	.in_configure_hw = nfcsim_in_configure_hw,
 	.in_send_cmd = nfcsim_in_send_cmd,
 

drivers/nfc/port100.c

@@ -1463,7 +1463,7 @@ static int port100_listen(struct nfc_digital_dev *ddev, u16 timeout,
 	return port100_tg_send_cmd(ddev, skb, timeout, cb, arg);
 }
 
-static struct nfc_digital_ops port100_digital_ops = {
+static const struct nfc_digital_ops port100_digital_ops = {
 	.in_configure_hw = port100_in_configure_hw,
 	.in_send_cmd = port100_in_send_cmd,
 

drivers/nfc/st95hf/core.c

@@ -1037,7 +1037,7 @@ static void st95hf_abort_cmd(struct nfc_digital_dev *ddev)
 {
 }
 
-static struct nfc_digital_ops st95hf_nfc_digital_ops = {
+static const struct nfc_digital_ops st95hf_nfc_digital_ops = {
 	.in_configure_hw = st95hf_in_configure_hw,
 	.in_send_cmd = st95hf_in_send_cmd,
 

drivers/nfc/trf7970a.c

@@ -1861,7 +1861,7 @@ static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
 	mutex_unlock(&trf->lock);
 }
 
-static struct nfc_digital_ops trf7970a_nfc_ops = {
+static const struct nfc_digital_ops trf7970a_nfc_ops = {
 	.in_configure_hw	= trf7970a_in_configure_hw,
 	.in_send_cmd		= trf7970a_send_cmd,
 	.tg_configure_hw	= trf7970a_tg_configure_hw,

include/net/nfc/digital.h

@@ -191,7 +191,7 @@ struct digital_poll_tech {
 
 struct nfc_digital_dev {
 	struct nfc_dev *nfc_dev;
-	struct nfc_digital_ops *ops;
+	const struct nfc_digital_ops *ops;
 
 	u32 protocols;
 
@@ -236,7 +236,7 @@ struct nfc_digital_dev {
 	void (*skb_add_crc)(struct sk_buff *skb);
 };
 
-struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
+struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops,
 						    __u32 supported_protocols,
 						    __u32 driver_capabilities,
 						    int tx_headroom,

net/nfc/digital_core.c

@@ -745,7 +745,7 @@ static const struct nfc_ops digital_nfc_ops = {
 	.im_transceive = digital_in_send,
 };
 
-struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
+struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops,
 					    __u32 supported_protocols,
 					    __u32 driver_capabilities,
 					    int tx_headroom, int tx_tailroom)