nfc: constify nfc_hci_ops

Neither the core nor the drivers modify the passed pointer to struct
nfc_hci_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/microread/microread.c

@@ -625,7 +625,7 @@ static int microread_event_received(struct nfc_hci_dev *hdev, u8 pipe,
 	return r;
 }
 
-static struct nfc_hci_ops microread_hci_ops = {
+static const struct nfc_hci_ops microread_hci_ops = {
 	.open = microread_open,
 	.close = microread_close,
 	.hci_ready = microread_hci_ready,

drivers/nfc/pn544/pn544.c

@@ -881,7 +881,7 @@ static int pn544_hci_disable_se(struct nfc_hci_dev *hdev, u32 se_idx)
 	}
 }
 
-static struct nfc_hci_ops pn544_hci_ops = {
+static const struct nfc_hci_ops pn544_hci_ops = {
 	.open = pn544_hci_open,
 	.close = pn544_hci_close,
 	.hci_ready = pn544_hci_ready,

drivers/nfc/st21nfca/core.c

@@ -912,7 +912,7 @@ static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe,
 	}
 }
 
-static struct nfc_hci_ops st21nfca_hci_ops = {
+static const struct nfc_hci_ops st21nfca_hci_ops = {
 	.open = st21nfca_hci_open,
 	.close = st21nfca_hci_close,
 	.load_session = st21nfca_hci_load_session,

include/net/nfc/hci.h

@@ -118,7 +118,7 @@ struct nfc_hci_dev {
 
 	struct sk_buff_head msg_rx_queue;
 
-	struct nfc_hci_ops *ops;
+	const struct nfc_hci_ops *ops;
 
 	struct nfc_llc *llc;
 
@@ -151,7 +151,7 @@ struct nfc_hci_dev {
 };
 
 /* hci device allocation */
-struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
+struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
 					    struct nfc_hci_init_data *init_data,
 					    unsigned long quirks,
 					    u32 protocols,

net/nfc/hci/core.c

@@ -947,7 +947,7 @@ static const struct nfc_ops hci_nfc_ops = {
 	.se_io = hci_se_io,
 };
 
-struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
+struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
 					    struct nfc_hci_init_data *init_data,
 					    unsigned long quirks,
 					    u32 protocols,