[linux-nfc] [PATCH v2 0/8] nfc: constify pointed data - missed part

[linux-nfc] [PATCH v2 0/8] nfc: constify pointed data - missed part

[Krzysztof Kozlowski]

Hi,

This was previously sent [1] but got lost. It was a  prerequisite to part two of NFC const [2].

Changes since v1:
1. Add patch 1/8 fixing up nfcmrvl_spi_parse_dt()

[1] https://lore.kernel.org/lkml/20210726145224.146006-1-krzysztof.kozlowski@canonical.com/
[2] https://lore.kernel.org/linux-nfc/20210729104022.47761-1-krzysztof.kozlowski@canonical.com/T/#m199fbdde180fa005a10addf28479fcbdc6263eab

Best regards,
Krzysztof


Krzysztof Kozlowski (8):
  nfc: mrvl: correct nfcmrvl_spi_parse_dt() device_node argument
  nfc: annotate af_nfc_exit() as __exit
  nfc: hci: annotate nfc_llc_init() as __init
  nfc: constify several pointers to u8, char and sk_buff
  nfc: constify local pointer variables
  nfc: nci: constify several pointers to u8, sk_buff and other structs
  nfc: hci: pass callback data param as pointer in nci_request()
  nfc: hci: cleanup unneeded spaces

 drivers/nfc/nfcmrvl/spi.c  |   2 +-
 drivers/nfc/pn544/pn544.c  |   4 +-
 include/net/nfc/nci_core.h |  18 ++---
 include/net/nfc/nfc.h      |   4 +-
 net/nfc/af_nfc.c           |   2 +-
 net/nfc/core.c             |   6 +-
 net/nfc/hci/core.c         |   8 +--
 net/nfc/hci/llc.c          |   2 +-
 net/nfc/hci/llc_shdlc.c    |  10 +--
 net/nfc/llcp.h             |   8 +--
 net/nfc/llcp_commands.c    |  46 +++++++------
 net/nfc/llcp_core.c        |  44 ++++++------
 net/nfc/nci/core.c         | 134 ++++++++++++++++++-------------------
 net/nfc/nci/data.c         |  12 ++--
 net/nfc/nci/hci.c          |  52 +++++++-------
 net/nfc/nci/ntf.c          |  87 +++++++++++++-----------
 net/nfc/nci/rsp.c          |  48 +++++++------
 net/nfc/nci/spi.c          |   2 +-
 net/nfc/netlink.c          |   2 +-
 net/nfc/nfc.h              |   2 +-
 20 files changed, 255 insertions(+), 238 deletions(-)

-- 
2.27.0
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[linux-nfc] [PATCH v2 1/8] nfc: mrvl: correct nfcmrvl_spi_parse_dt() device_node argument

[Krzysztof Kozlowski]

The device_node in nfcmrvl_spi_parse_dt() cannot be const as it is
passed to OF functions which modify it.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/nfc/nfcmrvl/spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nfc/nfcmrvl/spi.c b/drivers/nfc/nfcmrvl/spi.c
index d64abd0c4df3..b182ab2e03c0 100644
--- a/drivers/nfc/nfcmrvl/spi.c
+++ b/drivers/nfc/nfcmrvl/spi.c
@@ -106,7 +106,7 @@ static const struct nfcmrvl_if_ops spi_ops = {
 	.nci_update_config = nfcmrvl_spi_nci_update_config,
 };
 
-static int nfcmrvl_spi_parse_dt(const struct device_node *node,
+static int nfcmrvl_spi_parse_dt(struct device_node *node,
 				struct nfcmrvl_platform_data *pdata)
 {
 	int ret;
-- 
2.27.0
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[linux-nfc] [PATCH v2 2/8] nfc: annotate af_nfc_exit() as __exit

[Krzysztof Kozlowski]

The af_nfc_exit() is used only in other __exit annotated context
(nfc_exit()).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 net/nfc/af_nfc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/nfc/af_nfc.c b/net/nfc/af_nfc.c
index 4a9e72073564..6024fad905ff 100644
--- a/net/nfc/af_nfc.c
+++ b/net/nfc/af_nfc.c
@@ -79,7 +79,7 @@ int __init af_nfc_init(void)
 	return sock_register(&nfc_sock_family_ops);
 }
 
-void af_nfc_exit(void)
+void __exit af_nfc_exit(void)
 {
 	sock_unregister(PF_NFC);
 }
-- 
2.27.0
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[linux-nfc] [PATCH v2 3/8] nfc: hci: annotate nfc_llc_init() as __init

[Krzysztof Kozlowski]

The nfc_llc_init() is used only in other __init annotated context.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 net/nfc/hci/llc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/nfc/hci/llc.c b/net/nfc/hci/llc.c
index fc6b63de3462..2140f6724644 100644
--- a/net/nfc/hci/llc.c
+++ b/net/nfc/hci/llc.c
@@ -11,7 +11,7 @@
 
 static LIST_HEAD(llc_engines);
 
-int nfc_llc_init(void)
+int __init nfc_llc_init(void)
 {
 	int r;
 
-- 
2.27.0
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[linux-nfc] [PATCH v2 4/8] nfc: constify several pointers to u8, char and sk_buff

[Krzysztof Kozlowski]

Several functions receive pointers to u8, char or sk_buff but do not
modify the contents so make them const.  This allows doing the same for
local variables and in total makes the code a little bit safer.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 include/net/nfc/nfc.h   |  4 ++--
 net/nfc/core.c          |  4 ++--
 net/nfc/hci/llc_shdlc.c | 10 ++++-----
 net/nfc/llcp.h          |  8 +++----
 net/nfc/llcp_commands.c | 46 ++++++++++++++++++++++-------------------
 net/nfc/llcp_core.c     | 44 +++++++++++++++++++++------------------
 net/nfc/nfc.h           |  2 +-
 7 files changed, 63 insertions(+), 55 deletions(-)

diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 901779138e2b..5dee575fbe86 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -266,7 +266,7 @@ struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 
 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
-				 u8 *gt, u8 gt_len);
+				 const u8 *gt, u8 gt_len);
 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
 
 int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
@@ -280,7 +280,7 @@ int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 		       u8 comm_mode, u8 rf_mode);
 
 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
-		     u8 *gb, size_t gb_len);
+		     const u8 *gb, size_t gb_len);
 int nfc_tm_deactivated(struct nfc_dev *dev);
 int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 6ade54149b73..08182e209144 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -636,7 +636,7 @@ int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
 	return rc;
 }
 
-int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
+int nfc_set_remote_general_bytes(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 {
 	pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
 
@@ -665,7 +665,7 @@ int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
 EXPORT_SYMBOL(nfc_tm_data_received);
 
 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
-		     u8 *gb, size_t gb_len)
+		     const u8 *gb, size_t gb_len)
 {
 	int rc;
 
diff --git a/net/nfc/hci/llc_shdlc.c b/net/nfc/hci/llc_shdlc.c
index 6b747856d095..aef750d7787c 100644
--- a/net/nfc/hci/llc_shdlc.c
+++ b/net/nfc/hci/llc_shdlc.c
@@ -123,7 +123,7 @@ static bool llc_shdlc_x_lteq_y_lt_z(int x, int y, int z)
 		return ((y >= x) || (y < z)) ? true : false;
 }
 
-static struct sk_buff *llc_shdlc_alloc_skb(struct llc_shdlc *shdlc,
+static struct sk_buff *llc_shdlc_alloc_skb(const struct llc_shdlc *shdlc,
 					   int payload_len)
 {
 	struct sk_buff *skb;
@@ -137,7 +137,7 @@ static struct sk_buff *llc_shdlc_alloc_skb(struct llc_shdlc *shdlc,
 }
 
 /* immediately sends an S frame. */
-static int llc_shdlc_send_s_frame(struct llc_shdlc *shdlc,
+static int llc_shdlc_send_s_frame(const struct llc_shdlc *shdlc,
 				  enum sframe_type sframe_type, int nr)
 {
 	int r;
@@ -159,7 +159,7 @@ static int llc_shdlc_send_s_frame(struct llc_shdlc *shdlc,
 }
 
 /* immediately sends an U frame. skb may contain optional payload */
-static int llc_shdlc_send_u_frame(struct llc_shdlc *shdlc,
+static int llc_shdlc_send_u_frame(const struct llc_shdlc *shdlc,
 				  struct sk_buff *skb,
 				  enum uframe_modifier uframe_modifier)
 {
@@ -361,7 +361,7 @@ static void llc_shdlc_connect_complete(struct llc_shdlc *shdlc, int r)
 	wake_up(shdlc->connect_wq);
 }
 
-static int llc_shdlc_connect_initiate(struct llc_shdlc *shdlc)
+static int llc_shdlc_connect_initiate(const struct llc_shdlc *shdlc)
 {
 	struct sk_buff *skb;
 
@@ -377,7 +377,7 @@ static int llc_shdlc_connect_initiate(struct llc_shdlc *shdlc)
 	return llc_shdlc_send_u_frame(shdlc, skb, U_FRAME_RSET);
 }
 
-static int llc_shdlc_connect_send_ua(struct llc_shdlc *shdlc)
+static int llc_shdlc_connect_send_ua(const struct llc_shdlc *shdlc)
 {
 	struct sk_buff *skb;
 
diff --git a/net/nfc/llcp.h b/net/nfc/llcp.h
index 97853c9cefc7..d49d4bf2e37c 100644
--- a/net/nfc/llcp.h
+++ b/net/nfc/llcp.h
@@ -221,15 +221,15 @@ struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
 
 /* TLV API */
 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
-			  u8 *tlv_array, u16 tlv_array_len);
+			  const u8 *tlv_array, u16 tlv_array_len);
 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
-				  u8 *tlv_array, u16 tlv_array_len);
+				  const u8 *tlv_array, u16 tlv_array_len);
 
 /* Commands API */
 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
-u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
+u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length);
 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap);
-struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
+struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
 						  size_t uri_len);
 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp);
 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *sdp_head);
diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index 475061c79c44..3c4172a5aeb5 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -15,7 +15,7 @@
 #include "nfc.h"
 #include "llcp.h"
 
-static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
+static const u8 llcp_tlv_length[LLCP_TLV_MAX] = {
 	0,
 	1, /* VERSION */
 	2, /* MIUX */
@@ -29,7 +29,7 @@ static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
 
 };
 
-static u8 llcp_tlv8(u8 *tlv, u8 type)
+static u8 llcp_tlv8(const u8 *tlv, u8 type)
 {
 	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
 		return 0;
@@ -37,7 +37,7 @@ static u8 llcp_tlv8(u8 *tlv, u8 type)
 	return tlv[2];
 }
 
-static u16 llcp_tlv16(u8 *tlv, u8 type)
+static u16 llcp_tlv16(const u8 *tlv, u8 type)
 {
 	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
 		return 0;
@@ -46,37 +46,37 @@ static u16 llcp_tlv16(u8 *tlv, u8 type)
 }
 
 
-static u8 llcp_tlv_version(u8 *tlv)
+static u8 llcp_tlv_version(const u8 *tlv)
 {
 	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
 }
 
-static u16 llcp_tlv_miux(u8 *tlv)
+static u16 llcp_tlv_miux(const u8 *tlv)
 {
 	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
 }
 
-static u16 llcp_tlv_wks(u8 *tlv)
+static u16 llcp_tlv_wks(const u8 *tlv)
 {
 	return llcp_tlv16(tlv, LLCP_TLV_WKS);
 }
 
-static u16 llcp_tlv_lto(u8 *tlv)
+static u16 llcp_tlv_lto(const u8 *tlv)
 {
 	return llcp_tlv8(tlv, LLCP_TLV_LTO);
 }
 
-static u8 llcp_tlv_opt(u8 *tlv)
+static u8 llcp_tlv_opt(const u8 *tlv)
 {
 	return llcp_tlv8(tlv, LLCP_TLV_OPT);
 }
 
-static u8 llcp_tlv_rw(u8 *tlv)
+static u8 llcp_tlv_rw(const u8 *tlv)
 {
 	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
 }
 
-u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
+u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length)
 {
 	u8 *tlv, length;
 
@@ -130,7 +130,7 @@ struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
 	return sdres;
 }
 
-struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
+struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
 						  size_t uri_len)
 {
 	struct nfc_llcp_sdp_tlv *sdreq;
@@ -190,9 +190,10 @@ void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
 }
 
 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
-			  u8 *tlv_array, u16 tlv_array_len)
+			  const u8 *tlv_array, u16 tlv_array_len)
 {
-	u8 *tlv = tlv_array, type, length, offset = 0;
+	const u8 *tlv = tlv_array;
+	u8 type, length, offset = 0;
 
 	pr_debug("TLV array length %d\n", tlv_array_len);
 
@@ -239,9 +240,10 @@ int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
 }
 
 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
-				  u8 *tlv_array, u16 tlv_array_len)
+				  const u8 *tlv_array, u16 tlv_array_len)
 {
-	u8 *tlv = tlv_array, type, length, offset = 0;
+	const u8 *tlv = tlv_array;
+	u8 type, length, offset = 0;
 
 	pr_debug("TLV array length %d\n", tlv_array_len);
 
@@ -295,7 +297,7 @@ static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
 	return pdu;
 }
 
-static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
+static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv,
 				    u8 tlv_length)
 {
 	/* XXX Add an skb length check */
@@ -389,9 +391,10 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
 {
 	struct nfc_llcp_local *local;
 	struct sk_buff *skb;
-	u8 *service_name_tlv = NULL, service_name_tlv_length;
-	u8 *miux_tlv = NULL, miux_tlv_length;
-	u8 *rw_tlv = NULL, rw_tlv_length, rw;
+	const u8 *service_name_tlv = NULL;
+	const u8 *miux_tlv = NULL;
+	const u8 *rw_tlv = NULL;
+	u8 service_name_tlv_length, miux_tlv_length,  rw_tlv_length, rw;
 	int err;
 	u16 size = 0;
 	__be16 miux;
@@ -465,8 +468,9 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
 {
 	struct nfc_llcp_local *local;
 	struct sk_buff *skb;
-	u8 *miux_tlv = NULL, miux_tlv_length;
-	u8 *rw_tlv = NULL, rw_tlv_length, rw;
+	const u8 *miux_tlv = NULL;
+	const u8 *rw_tlv = NULL;
+	u8 miux_tlv_length, rw_tlv_length, rw;
 	int err;
 	u16 size = 0;
 	__be16 miux;
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
index cc997518f79d..eaeb2b1cfa6a 100644
--- a/net/nfc/llcp_core.c
+++ b/net/nfc/llcp_core.c
@@ -301,7 +301,7 @@ static char *wks[] = {
 	"urn:nfc:sn:snep",
 };
 
-static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
+static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 {
 	int sap, num_wks;
 
@@ -325,7 +325,7 @@ static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 
 static
 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
-					    u8 *sn, size_t sn_len)
+					    const u8 *sn, size_t sn_len)
 {
 	struct sock *sk;
 	struct nfc_llcp_sock *llcp_sock, *tmp_sock;
@@ -522,7 +522,7 @@ static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 {
 	u8 *gb_cur, version, version_length;
 	u8 lto_length, wks_length, miux_length;
-	u8 *version_tlv = NULL, *lto_tlv = NULL,
+	const u8 *version_tlv = NULL, *lto_tlv = NULL,
 	   *wks_tlv = NULL, *miux_tlv = NULL;
 	__be16 wks = cpu_to_be16(local->local_wks);
 	u8 gb_len = 0;
@@ -612,7 +612,7 @@ u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 	return local->gb;
 }
 
-int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
+int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 {
 	struct nfc_llcp_local *local;
 
@@ -639,27 +639,27 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 				     local->remote_gb_len - 3);
 }
 
-static u8 nfc_llcp_dsap(struct sk_buff *pdu)
+static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 {
 	return (pdu->data[0] & 0xfc) >> 2;
 }
 
-static u8 nfc_llcp_ptype(struct sk_buff *pdu)
+static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 {
 	return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 }
 
-static u8 nfc_llcp_ssap(struct sk_buff *pdu)
+static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 {
 	return pdu->data[1] & 0x3f;
 }
 
-static u8 nfc_llcp_ns(struct sk_buff *pdu)
+static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 {
 	return pdu->data[2] >> 4;
 }
 
-static u8 nfc_llcp_nr(struct sk_buff *pdu)
+static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 {
 	return pdu->data[2] & 0xf;
 }
@@ -801,7 +801,7 @@ static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local
 }
 
 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
-						  u8 *sn, size_t sn_len)
+						  const u8 *sn, size_t sn_len)
 {
 	struct nfc_llcp_sock *llcp_sock;
 
@@ -815,9 +815,10 @@ static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 	return llcp_sock;
 }
 
-static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
+static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
 {
-	u8 *tlv = &skb->data[2], type, length;
+	u8 type, length;
+	const u8 *tlv = &skb->data[2];
 	size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 
 	while (offset < tlv_array_len) {
@@ -875,7 +876,7 @@ static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 }
 
 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
-				  struct sk_buff *skb)
+				  const struct sk_buff *skb)
 {
 	struct sock *new_sk, *parent;
 	struct nfc_llcp_sock *sock, *new_sock;
@@ -893,7 +894,7 @@ static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 			goto fail;
 		}
 	} else {
-		u8 *sn;
+		const u8 *sn;
 		size_t sn_len;
 
 		sn = nfc_llcp_connect_sn(skb, &sn_len);
@@ -1112,7 +1113,7 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
 }
 
 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
-			       struct sk_buff *skb)
+			       const struct sk_buff *skb)
 {
 	struct nfc_llcp_sock *llcp_sock;
 	struct sock *sk;
@@ -1155,7 +1156,8 @@ static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
 	nfc_llcp_sock_put(llcp_sock);
 }
 
-static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
+static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
+			     const struct sk_buff *skb)
 {
 	struct nfc_llcp_sock *llcp_sock;
 	struct sock *sk;
@@ -1188,7 +1190,8 @@ static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
 	nfc_llcp_sock_put(llcp_sock);
 }
 
-static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
+static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
+			     const struct sk_buff *skb)
 {
 	struct nfc_llcp_sock *llcp_sock;
 	struct sock *sk;
@@ -1226,12 +1229,13 @@ static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
 }
 
 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
-			      struct sk_buff *skb)
+			      const struct sk_buff *skb)
 {
 	struct nfc_llcp_sock *llcp_sock;
-	u8 dsap, ssap, *tlv, type, length, tid, sap;
+	u8 dsap, ssap, type, length, tid, sap;
+	const u8 *tlv;
 	u16 tlv_len, offset;
-	char *service_name;
+	const char *service_name;
 	size_t service_name_len;
 	struct nfc_llcp_sdp_tlv *sdp;
 	HLIST_HEAD(llc_sdres_list);
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index 889fefd64e56..de2ec66d7e83 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -48,7 +48,7 @@ void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
 			u8 comm_mode, u8 rf_mode);
 int nfc_llcp_register_device(struct nfc_dev *dev);
 void nfc_llcp_unregister_device(struct nfc_dev *dev);
-int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len);
+int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len);
 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len);
 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
-- 
2.27.0
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[linux-nfc] [PATCH v2 5/8] nfc: constify local pointer variables

[Krzysztof Kozlowski]

Few pointers to struct nfc_target and struct nfc_se can be made const.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/nfc/pn544/pn544.c | 4 ++--
 net/nfc/core.c            | 2 +-
 net/nfc/hci/core.c        | 8 ++++----
 net/nfc/netlink.c         | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/nfc/pn544/pn544.c b/drivers/nfc/pn544/pn544.c
index c2b4555ab4b7..092f03b80a78 100644
--- a/drivers/nfc/pn544/pn544.c
+++ b/drivers/nfc/pn544/pn544.c
@@ -809,7 +809,7 @@ static int pn544_hci_discover_se(struct nfc_hci_dev *hdev)
 #define PN544_SE_MODE_ON	0x01
 static int pn544_hci_enable_se(struct nfc_hci_dev *hdev, u32 se_idx)
 {
-	struct nfc_se *se;
+	const struct nfc_se *se;
 	u8 enable = PN544_SE_MODE_ON;
 	static struct uicc_gatelist {
 		u8 head;
@@ -864,7 +864,7 @@ static int pn544_hci_enable_se(struct nfc_hci_dev *hdev, u32 se_idx)
 
 static int pn544_hci_disable_se(struct nfc_hci_dev *hdev, u32 se_idx)
 {
-	struct nfc_se *se;
+	const struct nfc_se *se;
 	u8 disable = PN544_SE_MODE_OFF;
 
 	se = nfc_find_se(hdev->ndev, se_idx);
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 08182e209144..3c645c1d99c9 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -824,7 +824,7 @@ EXPORT_SYMBOL(nfc_targets_found);
  */
 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
 {
-	struct nfc_target *tg;
+	const struct nfc_target *tg;
 	int i;
 
 	pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
index ff94ac774937..ceb87db57cdb 100644
--- a/net/nfc/hci/core.c
+++ b/net/nfc/hci/core.c
@@ -128,7 +128,7 @@ static void nfc_hci_msg_rx_work(struct work_struct *work)
 	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 						msg_rx_work);
 	struct sk_buff *skb;
-	struct hcp_message *message;
+	const struct hcp_message *message;
 	u8 pipe;
 	u8 type;
 	u8 instruction;
@@ -182,9 +182,9 @@ void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 			  struct sk_buff *skb)
 {
 	u8 status = NFC_HCI_ANY_OK;
-	struct hci_create_pipe_resp *create_info;
-	struct hci_delete_pipe_noti *delete_info;
-	struct hci_all_pipe_cleared_noti *cleared_info;
+	const struct hci_create_pipe_resp *create_info;
+	const struct hci_delete_pipe_noti *delete_info;
+	const struct hci_all_pipe_cleared_noti *cleared_info;
 	u8 gate;
 
 	pr_debug("from pipe %x cmd %x\n", pipe, cmd);
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 70467a82be8f..49089c50872e 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -530,7 +530,7 @@ int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
 
 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
 {
-	struct nfc_se *se;
+	const struct nfc_se *se;
 	struct sk_buff *msg;
 	void *hdr;
 
-- 
2.27.0
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[linux-nfc] [PATCH v2 6/8] nfc: nci: constify several pointers to u8, sk_buff and other structs

[Krzysztof Kozlowski]

Several functions receive pointers to u8, sk_buff or other structs but
do not modify the contents so make them const.  This allows doing the
same for local variables and in total makes the code a little bit safer.

This makes const also data passed as "unsigned long opt" argument to
nci_request() function.  Usual flow for such functions is:
1. Receive "u8 *" and store it (the pointer) in a structure
   allocated on stack (e.g. struct nci_set_config_param),
2. Call nci_request() or __nci_request() passing a callback function an
   the pointer to the structure via an "unsigned long opt",
3. nci_request() calls the callback which dereferences "unsigned long
   opt" in a read-only way.

This converts all above paths to use proper pointer to const data, so
entire flow is safer.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 include/net/nfc/nci_core.h | 14 ++++---
 net/nfc/nci/core.c         | 40 +++++++++---------
 net/nfc/nci/data.c         | 12 +++---
 net/nfc/nci/hci.c          | 24 +++++------
 net/nfc/nci/ntf.c          | 83 +++++++++++++++++++++-----------------
 net/nfc/nci/rsp.c          | 46 +++++++++++----------
 net/nfc/nci/spi.c          |  2 +-
 7 files changed, 118 insertions(+), 103 deletions(-)

diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index 00f2c60971d7..4770a81f4aa7 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -278,23 +278,25 @@ int nci_request(struct nci_dev *ndev,
 		void (*req)(struct nci_dev *ndev,
 			    unsigned long opt),
 		unsigned long opt, __u32 timeout);
-int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload);
-int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload);
+int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len,
+		 const __u8 *payload);
+int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
+		 const __u8 *payload);
 int nci_core_reset(struct nci_dev *ndev);
 int nci_core_init(struct nci_dev *ndev);
 
 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb);
 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb);
-int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val);
+int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val);
 
 int nci_nfcee_discover(struct nci_dev *ndev, u8 action);
 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode);
 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
 			 u8 number_destination_params,
 			 size_t params_len,
-			 struct core_conn_create_dest_spec_params *params);
+			 const struct core_conn_create_dest_spec_params *params);
 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id);
-int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
+int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
 		      struct sk_buff **resp);
 
 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev);
@@ -378,7 +380,7 @@ void nci_req_complete(struct nci_dev *ndev, int result);
 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
 						   int conn_id);
 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
-					  struct dest_spec_params *params);
+					  const struct dest_spec_params *params);
 
 /* ----- NCI status code ----- */
 int nci_to_errno(__u8 code);
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 400d66c4e210..774ddf957388 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -53,9 +53,9 @@ struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
 }
 
 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
-					  struct dest_spec_params *params)
+					  const struct dest_spec_params *params)
 {
-	struct nci_conn_info *conn_info;
+	const struct nci_conn_info *conn_info;
 
 	list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
 		if (conn_info->dest_type == dest_type) {
@@ -210,14 +210,15 @@ static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
 }
 
 struct nci_set_config_param {
-	__u8	id;
-	size_t	len;
-	__u8	*val;
+	__u8		id;
+	size_t		len;
+	const __u8	*val;
 };
 
 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
+	const struct nci_set_config_param *param =
+		(struct nci_set_config_param *)opt;
 	struct nci_core_set_config_cmd cmd;
 
 	BUG_ON(param->len > NCI_MAX_PARAM_LEN);
@@ -237,7 +238,7 @@ struct nci_rf_discover_param {
 
 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_rf_discover_param *param =
+	const struct nci_rf_discover_param *param =
 		(struct nci_rf_discover_param *)opt;
 	struct nci_rf_disc_cmd cmd;
 
@@ -303,7 +304,7 @@ struct nci_rf_discover_select_param {
 
 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_rf_discover_select_param *param =
+	const struct nci_rf_discover_select_param *param =
 		(struct nci_rf_discover_select_param *)opt;
 	struct nci_rf_discover_select_cmd cmd;
 
@@ -341,18 +342,18 @@ static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 struct nci_cmd_param {
 	__u16 opcode;
 	size_t len;
-	__u8 *payload;
+	const __u8 *payload;
 };
 
 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_cmd_param *param =
+	const struct nci_cmd_param *param =
 		(struct nci_cmd_param *)opt;
 
 	nci_send_cmd(ndev, param->opcode, param->len, param->payload);
 }
 
-int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
+int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload)
 {
 	struct nci_cmd_param param;
 
@@ -365,7 +366,8 @@ int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
 }
 EXPORT_SYMBOL(nci_prop_cmd);
 
-int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
+int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
+		 const __u8 *payload)
 {
 	struct nci_cmd_param param;
 
@@ -399,7 +401,7 @@ struct nci_loopback_data {
 
 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
+	const struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
 
 	nci_send_data(ndev, data->conn_id, data->data);
 }
@@ -420,7 +422,7 @@ static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
 	nci_req_complete(ndev, NCI_STATUS_OK);
 }
 
-int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
+int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
 		      struct sk_buff **resp)
 {
 	int r;
@@ -624,7 +626,7 @@ static int nci_dev_down(struct nfc_dev *nfc_dev)
 	return nci_close_device(ndev);
 }
 
-int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
+int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
 {
 	struct nci_set_config_param param;
 
@@ -659,7 +661,7 @@ EXPORT_SYMBOL(nci_nfcee_discover);
 
 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_nfcee_mode_set_cmd *cmd =
+	const struct nci_nfcee_mode_set_cmd *cmd =
 					(struct nci_nfcee_mode_set_cmd *)opt;
 
 	nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
@@ -681,7 +683,7 @@ EXPORT_SYMBOL(nci_nfcee_mode_set);
 
 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct core_conn_create_data *data =
+	const struct core_conn_create_data *data =
 					(struct core_conn_create_data *)opt;
 
 	nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
@@ -690,7 +692,7 @@ static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
 			 u8 number_destination_params,
 			 size_t params_len,
-			 struct core_conn_create_dest_spec_params *params)
+			 const struct core_conn_create_dest_spec_params *params)
 {
 	int r;
 	struct nci_core_conn_create_cmd *cmd;
@@ -863,7 +865,7 @@ static int nci_activate_target(struct nfc_dev *nfc_dev,
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 	struct nci_rf_discover_select_param param;
-	struct nfc_target *nci_target = NULL;
+	const struct nfc_target *nci_target = NULL;
 	int i;
 	int rc = 0;
 
diff --git a/net/nfc/nci/data.c b/net/nfc/nci/data.c
index ce3382be937f..6055dc9a82aa 100644
--- a/net/nfc/nci/data.c
+++ b/net/nfc/nci/data.c
@@ -26,7 +26,7 @@
 void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
 				__u8 conn_id, int err)
 {
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 	data_exchange_cb_t cb;
 	void *cb_context;
 
@@ -80,7 +80,7 @@ static inline void nci_push_data_hdr(struct nci_dev *ndev,
 
 int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id)
 {
-	struct nci_conn_info *conn_info;
+	const struct nci_conn_info *conn_info;
 
 	conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
 	if (!conn_info)
@@ -93,9 +93,9 @@ EXPORT_SYMBOL(nci_conn_max_data_pkt_payload_size);
 static int nci_queue_tx_data_frags(struct nci_dev *ndev,
 				   __u8 conn_id,
 				   struct sk_buff *skb) {
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 	int total_len = skb->len;
-	unsigned char *data = skb->data;
+	const unsigned char *data = skb->data;
 	unsigned long flags;
 	struct sk_buff_head frags_q;
 	struct sk_buff *skb_frag;
@@ -166,7 +166,7 @@ static int nci_queue_tx_data_frags(struct nci_dev *ndev,
 /* Send NCI data */
 int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb)
 {
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 	int rc = 0;
 
 	pr_debug("conn_id 0x%x, plen %d\n", conn_id, skb->len);
@@ -269,7 +269,7 @@ void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
 	__u8 pbf = nci_pbf(skb->data);
 	__u8 status = 0;
 	__u8 conn_id = nci_conn_id(skb->data);
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 
 	pr_debug("len %d\n", skb->len);
 
diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index d6732e5e8958..71a306b29735 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -142,7 +142,7 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 			     const u8 data_type, const u8 *data,
 			     size_t data_len)
 {
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 	struct sk_buff *skb;
 	int len, i, r;
 	u8 cb = pipe;
@@ -197,7 +197,7 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 
 static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 {
-	struct nci_data *data = (struct nci_data *)opt;
+	const struct nci_data *data = (struct nci_data *)opt;
 
 	nci_hci_send_data(ndev, data->pipe, data->cmd,
 			  data->data, data->data_len);
@@ -221,8 +221,8 @@ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 		     const u8 *param, size_t param_len,
 		     struct sk_buff **skb)
 {
-	struct nci_hcp_message *message;
-	struct nci_conn_info   *conn_info;
+	const struct nci_hcp_message *message;
+	const struct nci_conn_info *conn_info;
 	struct nci_data data;
 	int r;
 	u8 pipe = ndev->hci_dev->gate2pipe[gate];
@@ -406,7 +406,7 @@ static void nci_hci_msg_rx_work(struct work_struct *work)
 	struct nci_hci_dev *hdev =
 		container_of(work, struct nci_hci_dev, msg_rx_work);
 	struct sk_buff *skb;
-	struct nci_hcp_message *message;
+	const struct nci_hcp_message *message;
 	u8 pipe, type, instruction;
 
 	while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
@@ -498,7 +498,7 @@ void nci_hci_data_received_cb(void *context,
 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 {
 	struct nci_data data;
-	struct nci_conn_info    *conn_info;
+	const struct nci_conn_info *conn_info;
 
 	conn_info = ndev->hci_dev->conn_info;
 	if (!conn_info)
@@ -523,7 +523,7 @@ static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 	u8 pipe;
 	struct sk_buff *skb;
 	struct nci_hci_create_pipe_params params;
-	struct nci_hci_create_pipe_resp *resp;
+	const struct nci_hci_create_pipe_resp *resp;
 
 	pr_debug("gate=%d\n", dest_gate);
 
@@ -557,8 +557,8 @@ static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 		      const u8 *param, size_t param_len)
 {
-	struct nci_hcp_message *message;
-	struct nci_conn_info *conn_info;
+	const struct nci_hcp_message *message;
+	const struct nci_conn_info *conn_info;
 	struct nci_data data;
 	int r;
 	u8 *tmp;
@@ -605,8 +605,8 @@ EXPORT_SYMBOL(nci_hci_set_param);
 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 		      struct sk_buff **skb)
 {
-	struct nci_hcp_message *message;
-	struct nci_conn_info    *conn_info;
+	const struct nci_hcp_message *message;
+	const struct nci_conn_info *conn_info;
 	struct nci_data data;
 	int r;
 	u8 pipe = ndev->hci_dev->gate2pipe[gate];
@@ -697,7 +697,7 @@ EXPORT_SYMBOL(nci_hci_connect_gate);
 
 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 				     u8 gate_count,
-				     struct nci_hci_gate *gates)
+				     const struct nci_hci_gate *gates)
 {
 	int r;
 
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 98af04c86b2c..0a2ed25b9797 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -28,10 +28,10 @@
 /* Handle NCI Notification packets */
 
 static void nci_core_reset_ntf_packet(struct nci_dev *ndev,
-				      struct sk_buff *skb)
+				      const struct sk_buff *skb)
 {
 	/* Handle NCI 2.x core reset notification */
-	struct nci_core_reset_ntf *ntf = (void *)skb->data;
+	const struct nci_core_reset_ntf *ntf = (void *)skb->data;
 
 	ndev->nci_ver = ntf->nci_ver;
 	pr_debug("nci_ver 0x%x, config_status 0x%x\n",
@@ -80,7 +80,7 @@ static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
 }
 
 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
-					      struct sk_buff *skb)
+					      const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 
@@ -107,9 +107,10 @@ static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
 		nci_data_exchange_complete(ndev, NULL, ntf->conn_id, -EIO);
 }
 
-static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
-			struct rf_tech_specific_params_nfca_poll *nfca_poll,
-						     __u8 *data)
+static const __u8 *
+nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
+					struct rf_tech_specific_params_nfca_poll *nfca_poll,
+					const __u8 *data)
 {
 	nfca_poll->sens_res = __le16_to_cpu(*((__le16 *)data));
 	data += 2;
@@ -134,9 +135,10 @@ static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
 	return data;
 }
 
-static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
-			struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
-						     __u8 *data)
+static const __u8 *
+nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
+					struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
+					const __u8 *data)
 {
 	nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
 
@@ -148,9 +150,10 @@ static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 	return data;
 }
 
-static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
-			struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
-						     __u8 *data)
+static const __u8 *
+nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
+					struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
+					const __u8 *data)
 {
 	nfcf_poll->bit_rate = *data++;
 	nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
@@ -164,9 +167,10 @@ static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 	return data;
 }
 
-static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
-			struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
-						     __u8 *data)
+static const __u8 *
+nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
+					struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
+					const __u8 *data)
 {
 	++data;
 	nfcv_poll->dsfid = *data++;
@@ -175,9 +179,10 @@ static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
 	return data;
 }
 
-static __u8 *nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
-			struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
-						     __u8 *data)
+static const __u8 *
+nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
+					  struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
+					  const __u8 *data)
 {
 	nfcf_listen->local_nfcid2_len = min_t(__u8, *data++,
 					      NFC_NFCID2_MAXSIZE);
@@ -198,12 +203,12 @@ static int nci_add_new_protocol(struct nci_dev *ndev,
 				struct nfc_target *target,
 				__u8 rf_protocol,
 				__u8 rf_tech_and_mode,
-				void *params)
+				const void *params)
 {
-	struct rf_tech_specific_params_nfca_poll *nfca_poll;
-	struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
-	struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
-	struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
+	const struct rf_tech_specific_params_nfca_poll *nfca_poll;
+	const struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
+	const struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
+	const struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
 	__u32 protocol;
 
 	if (rf_protocol == NCI_RF_PROTOCOL_T1T)
@@ -274,7 +279,7 @@ static int nci_add_new_protocol(struct nci_dev *ndev,
 }
 
 static void nci_add_new_target(struct nci_dev *ndev,
-			       struct nci_rf_discover_ntf *ntf)
+			       const struct nci_rf_discover_ntf *ntf)
 {
 	struct nfc_target *target;
 	int i, rc;
@@ -319,10 +324,10 @@ void nci_clear_target_list(struct nci_dev *ndev)
 }
 
 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
-				       struct sk_buff *skb)
+				       const struct sk_buff *skb)
 {
 	struct nci_rf_discover_ntf ntf;
-	__u8 *data = skb->data;
+	const __u8 *data = skb->data;
 	bool add_target = true;
 
 	ntf.rf_discovery_id = *data++;
@@ -382,7 +387,8 @@ static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 }
 
 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
-			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
+						 struct nci_rf_intf_activated_ntf *ntf,
+						 const __u8 *data)
 {
 	struct activation_params_nfca_poll_iso_dep *nfca_poll;
 	struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
@@ -418,7 +424,8 @@ static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 }
 
 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
-			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
+						 struct nci_rf_intf_activated_ntf *ntf,
+						 const __u8 *data)
 {
 	struct activation_params_poll_nfc_dep *poll;
 	struct activation_params_listen_nfc_dep *listen;
@@ -454,7 +461,7 @@ static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
 }
 
 static void nci_target_auto_activated(struct nci_dev *ndev,
-				      struct nci_rf_intf_activated_ntf *ntf)
+				      const struct nci_rf_intf_activated_ntf *ntf)
 {
 	struct nfc_target *target;
 	int rc;
@@ -477,7 +484,7 @@ static void nci_target_auto_activated(struct nci_dev *ndev,
 }
 
 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
-		struct nci_rf_intf_activated_ntf *ntf)
+					   const struct nci_rf_intf_activated_ntf *ntf)
 {
 	ndev->remote_gb_len = 0;
 
@@ -519,11 +526,11 @@ static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 }
 
 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
-					     struct sk_buff *skb)
+					     const struct sk_buff *skb)
 {
 	struct nci_conn_info    *conn_info;
 	struct nci_rf_intf_activated_ntf ntf;
-	__u8 *data = skb->data;
+	const __u8 *data = skb->data;
 	int err = NCI_STATUS_OK;
 
 	ntf.rf_discovery_id = *data++;
@@ -681,10 +688,10 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 }
 
 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
-					 struct sk_buff *skb)
+					 const struct sk_buff *skb)
 {
-	struct nci_conn_info    *conn_info;
-	struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
+	const struct nci_conn_info *conn_info;
+	const struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 
 	pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 
@@ -725,10 +732,10 @@ static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 }
 
 static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
-					  struct sk_buff *skb)
+					  const struct sk_buff *skb)
 {
 	u8 status = NCI_STATUS_OK;
-	struct nci_nfcee_discover_ntf   *nfcee_ntf =
+	const struct nci_nfcee_discover_ntf *nfcee_ntf =
 				(struct nci_nfcee_discover_ntf *)skb->data;
 
 	pr_debug("\n");
@@ -745,7 +752,7 @@ static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
 }
 
 static void nci_nfcee_action_ntf_packet(struct nci_dev *ndev,
-					struct sk_buff *skb)
+					const struct sk_buff *skb)
 {
 	pr_debug("\n");
 }
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index e9605922a322..ebed2a7a0071 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -25,9 +25,10 @@
 
 /* Handle NCI Response packets */
 
-static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
+static void nci_core_reset_rsp_packet(struct nci_dev *ndev,
+				      const struct sk_buff *skb)
 {
-	struct nci_core_reset_rsp *rsp = (void *) skb->data;
+	const struct nci_core_reset_rsp *rsp = (void *) skb->data;
 
 	pr_debug("status 0x%x\n", rsp->status);
 
@@ -43,10 +44,11 @@ static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 	}
 }
 
-static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev, struct sk_buff *skb)
+static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev,
+				      const struct sk_buff *skb)
 {
-	struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
-	struct nci_core_init_rsp_2 *rsp_2;
+	const struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
+	const struct nci_core_init_rsp_2 *rsp_2;
 
 	pr_debug("status 0x%x\n", rsp_1->status);
 
@@ -81,10 +83,11 @@ static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev, struct sk_buff *skb)
 	return NCI_STATUS_OK;
 }
 
-static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev, struct sk_buff *skb)
+static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev,
+				      const struct sk_buff *skb)
 {
-	struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
-	u8 *supported_rf_interface = rsp->supported_rf_interfaces;
+	const struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
+	const u8 *supported_rf_interface = rsp->supported_rf_interfaces;
 	u8 rf_interface_idx = 0;
 	u8 rf_extension_cnt = 0;
 
@@ -118,7 +121,7 @@ static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev, struct sk_buff *skb)
 	return NCI_STATUS_OK;
 }
 
-static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
+static void nci_core_init_rsp_packet(struct nci_dev *ndev, const struct sk_buff *skb)
 {
 	u8 status = 0;
 
@@ -160,9 +163,9 @@ static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 }
 
 static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
-					   struct sk_buff *skb)
+					   const struct sk_buff *skb)
 {
-	struct nci_core_set_config_rsp *rsp = (void *) skb->data;
+	const struct nci_core_set_config_rsp *rsp = (void *) skb->data;
 
 	pr_debug("status 0x%x\n", rsp->status);
 
@@ -170,7 +173,7 @@ static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
-				       struct sk_buff *skb)
+				       const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 
@@ -179,7 +182,8 @@ static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 	nci_req_complete(ndev, status);
 }
 
-static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
+static void nci_rf_disc_rsp_packet(struct nci_dev *ndev,
+				   const struct sk_buff *skb)
 {
 	struct nci_conn_info    *conn_info;
 	__u8 status = skb->data[0];
@@ -210,7 +214,7 @@ static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 }
 
 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
-					  struct sk_buff *skb)
+					  const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 
@@ -222,7 +226,7 @@ static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
-					 struct sk_buff *skb)
+					 const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 
@@ -238,9 +242,9 @@ static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
-					  struct sk_buff *skb)
+					  const struct sk_buff *skb)
 {
-	struct nci_nfcee_discover_rsp *discover_rsp;
+	const struct nci_nfcee_discover_rsp *discover_rsp;
 
 	if (skb->len != 2) {
 		nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
@@ -255,7 +259,7 @@ static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
-					  struct sk_buff *skb)
+					  const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 
@@ -264,11 +268,11 @@ static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
-					    struct sk_buff *skb)
+					    const struct sk_buff *skb)
 {
 	__u8 status = skb->data[0];
 	struct nci_conn_info *conn_info = NULL;
-	struct nci_core_conn_create_rsp *rsp;
+	const struct nci_core_conn_create_rsp *rsp;
 
 	pr_debug("status 0x%x\n", status);
 
@@ -319,7 +323,7 @@ static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
 }
 
 static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
-					   struct sk_buff *skb)
+					   const struct sk_buff *skb)
 {
 	struct nci_conn_info *conn_info;
 	__u8 status = skb->data[0];
diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c
index 7d8e10e27c20..0935527d1d12 100644
--- a/net/nfc/nci/spi.c
+++ b/net/nfc/nci/spi.c
@@ -27,7 +27,7 @@
 
 #define CRC_INIT		0xFFFF
 
-static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb,
+static int __nci_spi_send(struct nci_spi *nspi, const struct sk_buff *skb,
 			  int cs_change)
 {
 	struct spi_message m;
-- 
2.27.0
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[linux-nfc] [PATCH v2 7/8] nfc: hci: pass callback data param as pointer in nci_request()

[Krzysztof Kozlowski]

The nci_request() receives a callback function and unsigned long data
argument "opt" which is passed to the callback.  Almost all of the
nci_request() callers pass pointer to a stack variable as data argument.
Only few pass scalar value (e.g. u8).

All such callbacks do not modify passed data argument and in previous
commit they were made as const.  However passing pointers via unsigned
long removes the const annotation.  The callback could simply cast
unsigned long to a pointer to writeable memory.

Use "const void *" as type of this "opt" argument to solve this and
prevent modifying the pointed contents.  This is also consistent with
generic pattern of passing data arguments - via "void *".  In few places
passing scalar values, use casts via "unsigned long" to suppress any
warnings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 include/net/nfc/nci_core.h |   4 +-
 net/nfc/nci/core.c         | 102 ++++++++++++++++++-------------------
 net/nfc/nci/hci.c          |  16 +++---
 3 files changed, 58 insertions(+), 64 deletions(-)

diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index 4770a81f4aa7..a964daedc17b 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -276,8 +276,8 @@ int nci_register_device(struct nci_dev *ndev);
 void nci_unregister_device(struct nci_dev *ndev);
 int nci_request(struct nci_dev *ndev,
 		void (*req)(struct nci_dev *ndev,
-			    unsigned long opt),
-		unsigned long opt, __u32 timeout);
+			    const void *opt),
+		const void *opt, __u32 timeout);
 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len,
 		 const __u8 *payload);
 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 774ddf957388..a17635612bcc 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -95,8 +95,8 @@ static void nci_req_cancel(struct nci_dev *ndev, int err)
 
 /* Execute request and wait for completion. */
 static int __nci_request(struct nci_dev *ndev,
-			 void (*req)(struct nci_dev *ndev, unsigned long opt),
-			 unsigned long opt, __u32 timeout)
+			 void (*req)(struct nci_dev *ndev, const void *opt),
+			 const void *opt, __u32 timeout)
 {
 	int rc = 0;
 	long completion_rc;
@@ -139,8 +139,8 @@ static int __nci_request(struct nci_dev *ndev,
 
 inline int nci_request(struct nci_dev *ndev,
 		       void (*req)(struct nci_dev *ndev,
-				   unsigned long opt),
-		       unsigned long opt, __u32 timeout)
+				   const void *opt),
+		       const void *opt, __u32 timeout)
 {
 	int rc;
 
@@ -155,7 +155,7 @@ inline int nci_request(struct nci_dev *ndev,
 	return rc;
 }
 
-static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_reset_req(struct nci_dev *ndev, const void *opt)
 {
 	struct nci_core_reset_cmd cmd;
 
@@ -163,17 +163,17 @@ static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
 	nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
 }
 
-static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_init_req(struct nci_dev *ndev, const void *opt)
 {
 	u8 plen = 0;
 
 	if (opt)
 		plen = sizeof(struct nci_core_init_v2_cmd);
 
-	nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, (void *)opt);
+	nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, opt);
 }
 
-static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_init_complete_req(struct nci_dev *ndev, const void *opt)
 {
 	struct nci_rf_disc_map_cmd cmd;
 	struct disc_map_config *cfg = cmd.mapping_configs;
@@ -215,10 +215,9 @@ struct nci_set_config_param {
 	const __u8	*val;
 };
 
-static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_set_config_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_set_config_param *param =
-		(struct nci_set_config_param *)opt;
+	const struct nci_set_config_param *param = opt;
 	struct nci_core_set_config_cmd cmd;
 
 	BUG_ON(param->len > NCI_MAX_PARAM_LEN);
@@ -236,10 +235,9 @@ struct nci_rf_discover_param {
 	__u32	tm_protocols;
 };
 
-static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_rf_discover_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_rf_discover_param *param =
-		(struct nci_rf_discover_param *)opt;
+	const struct nci_rf_discover_param *param = opt;
 	struct nci_rf_disc_cmd cmd;
 
 	cmd.num_disc_configs = 0;
@@ -302,10 +300,9 @@ struct nci_rf_discover_select_param {
 	__u8	rf_protocol;
 };
 
-static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_rf_discover_select_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_rf_discover_select_param *param =
-		(struct nci_rf_discover_select_param *)opt;
+	const struct nci_rf_discover_select_param *param = opt;
 	struct nci_rf_discover_select_cmd cmd;
 
 	cmd.rf_discovery_id = param->rf_discovery_id;
@@ -329,11 +326,11 @@ static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
 		     sizeof(struct nci_rf_discover_select_cmd), &cmd);
 }
 
-static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_rf_deactivate_req(struct nci_dev *ndev, const void *opt)
 {
 	struct nci_rf_deactivate_cmd cmd;
 
-	cmd.type = opt;
+	cmd.type = (unsigned long)opt;
 
 	nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
 		     sizeof(struct nci_rf_deactivate_cmd), &cmd);
@@ -345,10 +342,9 @@ struct nci_cmd_param {
 	const __u8 *payload;
 };
 
-static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_generic_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_cmd_param *param =
-		(struct nci_cmd_param *)opt;
+	const struct nci_cmd_param *param = opt;
 
 	nci_send_cmd(ndev, param->opcode, param->len, param->payload);
 }
@@ -361,7 +357,7 @@ int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload
 	param.len = len;
 	param.payload = payload;
 
-	return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
+	return __nci_request(ndev, nci_generic_req, &param,
 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_prop_cmd);
@@ -375,7 +371,7 @@ int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
 	param.len = len;
 	param.payload = payload;
 
-	return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
+	return __nci_request(ndev, nci_generic_req, &param,
 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_core_cmd);
@@ -399,9 +395,9 @@ struct nci_loopback_data {
 	struct sk_buff *data;
 };
 
-static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_send_data_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
+	const struct nci_loopback_data *data = opt;
 
 	nci_send_data(ndev, data->conn_id, data->data);
 }
@@ -462,7 +458,7 @@ int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
 	loopback_data.data = skb;
 
 	ndev->cur_conn_id = conn_id;
-	r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
+	r = nci_request(ndev, nci_send_data_req, &loopback_data,
 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
 	if (r == NCI_STATUS_OK && resp)
 		*resp = conn_info->rx_skb;
@@ -508,10 +504,10 @@ static int nci_open_device(struct nci_dev *ndev)
 			.feature1 = NCI_FEATURE_DISABLE,
 			.feature2 = NCI_FEATURE_DISABLE
 		};
-		unsigned long opt = 0;
+		const void *opt = NULL;
 
 		if (ndev->nci_ver & NCI_VER_2_MASK)
-			opt = (unsigned long)&nci_init_v2_cmd;
+			opt = &nci_init_v2_cmd;
 
 		rc = __nci_request(ndev, nci_init_req, opt,
 				   msecs_to_jiffies(NCI_INIT_TIMEOUT));
@@ -637,15 +633,15 @@ int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
 	param.len = len;
 	param.val = val;
 
-	return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
+	return __nci_request(ndev, nci_set_config_req, &param,
 			     msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_set_config);
 
-static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt)
 {
 	struct nci_nfcee_discover_cmd cmd;
-	__u8 action = opt;
+	__u8 action = (unsigned long)opt;
 
 	cmd.discovery_action = action;
 
@@ -654,15 +650,16 @@ static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
 
 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
 {
-	return __nci_request(ndev, nci_nfcee_discover_req, action,
+	unsigned long opt = action;
+
+	return __nci_request(ndev, nci_nfcee_discover_req, (void *)opt,
 				msecs_to_jiffies(NCI_CMD_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_nfcee_discover);
 
-static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_nfcee_mode_set_cmd *cmd =
-					(struct nci_nfcee_mode_set_cmd *)opt;
+	const struct nci_nfcee_mode_set_cmd *cmd = opt;
 
 	nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
 		     sizeof(struct nci_nfcee_mode_set_cmd), cmd);
@@ -675,16 +672,14 @@ int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
 	cmd.nfcee_id = nfcee_id;
 	cmd.nfcee_mode = nfcee_mode;
 
-	return __nci_request(ndev, nci_nfcee_mode_set_req,
-			     (unsigned long)&cmd,
+	return __nci_request(ndev, nci_nfcee_mode_set_req, &cmd,
 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_nfcee_mode_set);
 
-static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct core_conn_create_data *data =
-					(struct core_conn_create_data *)opt;
+	const struct core_conn_create_data *data = opt;
 
 	nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
 }
@@ -721,24 +716,26 @@ int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
 	}
 	ndev->cur_dest_type = destination_type;
 
-	r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
+	r = __nci_request(ndev, nci_core_conn_create_req, &data,
 			  msecs_to_jiffies(NCI_CMD_TIMEOUT));
 	kfree(cmd);
 	return r;
 }
 EXPORT_SYMBOL(nci_core_conn_create);
 
-static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt)
 {
-	__u8 conn_id = opt;
+	__u8 conn_id = (unsigned long)opt;
 
 	nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
 }
 
 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
 {
+	unsigned long opt = conn_id;
+
 	ndev->cur_conn_id = conn_id;
-	return __nci_request(ndev, nci_core_conn_close_req, conn_id,
+	return __nci_request(ndev, nci_core_conn_close_req, (void *)opt,
 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_core_conn_close);
@@ -758,14 +755,14 @@ static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
 
 	param.id = NCI_PN_ATR_REQ_GEN_BYTES;
 
-	rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
+	rc = nci_request(ndev, nci_set_config_req, &param,
 			 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 	if (rc)
 		return rc;
 
 	param.id = NCI_LN_ATR_RES_GEN_BYTES;
 
-	return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
+	return nci_request(ndev, nci_set_config_req, &param,
 			   msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 }
 
@@ -837,7 +834,7 @@ static int nci_start_poll(struct nfc_dev *nfc_dev,
 
 	param.im_protocols = im_protocols;
 	param.tm_protocols = tm_protocols;
-	rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
+	rc = nci_request(ndev, nci_rf_discover_req, &param,
 			 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
 
 	if (!rc)
@@ -915,8 +912,7 @@ static int nci_activate_target(struct nfc_dev *nfc_dev,
 		else
 			param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
 
-		rc = nci_request(ndev, nci_rf_discover_select_req,
-				 (unsigned long)&param,
+		rc = nci_request(ndev, nci_rf_discover_select_req, &param,
 				 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
 	}
 
@@ -931,7 +927,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 				  __u8 mode)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
-	u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
+	unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
 
 	pr_debug("entry\n");
 
@@ -949,7 +945,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 	}
 
 	if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
-		nci_request(ndev, nci_rf_deactivate_req, nci_mode,
+		nci_request(ndev, nci_rf_deactivate_req, (void *)nci_mode,
 			    msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 	}
 }
@@ -987,7 +983,7 @@ static int nci_dep_link_down(struct nfc_dev *nfc_dev)
 	} else {
 		if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
 		    atomic_read(&ndev->state) == NCI_DISCOVERY) {
-			nci_request(ndev, nci_rf_deactivate_req, 0,
+			nci_request(ndev, nci_rf_deactivate_req, (void *)0,
 				msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 		}
 
diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index 71a306b29735..163e5de7eda6 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -195,9 +195,9 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 	return i;
 }
 
-static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
+static void nci_hci_send_data_req(struct nci_dev *ndev, const void *opt)
 {
-	const struct nci_data *data = (struct nci_data *)opt;
+	const struct nci_data *data = opt;
 
 	nci_hci_send_data(ndev, data->pipe, data->cmd,
 			  data->data, data->data_len);
@@ -240,7 +240,7 @@ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 	data.data = param;
 	data.data_len = param_len;
 
-	r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
+	r = nci_request(ndev, nci_hci_send_data_req, &data,
 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
 	if (r == NCI_STATUS_OK) {
 		message = (struct nci_hcp_message *)conn_info->rx_skb->data;
@@ -511,9 +511,8 @@ int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 	data.data = NULL;
 	data.data_len = 0;
 
-	return nci_request(ndev, nci_hci_send_data_req,
-			(unsigned long)&data,
-			msecs_to_jiffies(NCI_DATA_TIMEOUT));
+	return nci_request(ndev, nci_hci_send_data_req, &data,
+			   msecs_to_jiffies(NCI_DATA_TIMEOUT));
 }
 EXPORT_SYMBOL(nci_hci_open_pipe);
 
@@ -587,8 +586,7 @@ int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 	data.data = tmp;
 	data.data_len = param_len + 1;
 
-	r = nci_request(ndev, nci_hci_send_data_req,
-			(unsigned long)&data,
+	r = nci_request(ndev, nci_hci_send_data_req, &data,
 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
 	if (r == NCI_STATUS_OK) {
 		message = (struct nci_hcp_message *)conn_info->rx_skb->data;
@@ -627,7 +625,7 @@ int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 	data.data = &idx;
 	data.data_len = 1;
 
-	r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
+	r = nci_request(ndev, nci_hci_send_data_req, &data,
 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
 
 	if (r == NCI_STATUS_OK) {
-- 
2.27.0
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[linux-nfc] [PATCH v2 8/8] nfc: hci: cleanup unneeded spaces

[Krzysztof Kozlowski]

No need for multiple spaces in variable declaration (the code does not
use them in other places).  No functional change.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 net/nfc/nci/core.c |  8 ++++----
 net/nfc/nci/hci.c  | 14 +++++++-------
 net/nfc/nci/ntf.c  |  4 ++--
 net/nfc/nci/rsp.c  |  2 +-
 4 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index a17635612bcc..b814d92da7a5 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -405,7 +405,7 @@ static void nci_send_data_req(struct nci_dev *ndev, const void *opt)
 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
 {
 	struct nci_dev *ndev = (struct nci_dev *)context;
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 
 	conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
 	if (!conn_info) {
@@ -1002,7 +1002,7 @@ static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 	int rc;
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 
 	conn_info = ndev->rf_conn_info;
 	if (!conn_info)
@@ -1267,7 +1267,7 @@ EXPORT_SYMBOL(nci_register_device);
  */
 void nci_unregister_device(struct nci_dev *ndev)
 {
-	struct nci_conn_info    *conn_info, *n;
+	struct nci_conn_info *conn_info, *n;
 
 	nci_close_device(ndev);
 
@@ -1439,7 +1439,7 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 static void nci_tx_work(struct work_struct *work)
 {
 	struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 	struct sk_buff *skb;
 
 	conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index 163e5de7eda6..e199912ee1e5 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -16,11 +16,11 @@
 #include <linux/nfc.h>
 
 struct nci_data {
-	u8              conn_id;
-	u8              pipe;
-	u8              cmd;
-	const u8        *data;
-	u32             data_len;
+	u8 conn_id;
+	u8 pipe;
+	u8 cmd;
+	const u8 *data;
+	u32 data_len;
 } __packed;
 
 struct nci_hci_create_pipe_params {
@@ -363,7 +363,7 @@ static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
 				  struct sk_buff *skb)
 {
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 
 	conn_info = ndev->hci_dev->conn_info;
 	if (!conn_info)
@@ -712,7 +712,7 @@ static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 
 int nci_hci_dev_session_init(struct nci_dev *ndev)
 {
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 	struct sk_buff *skb;
 	int r;
 
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 0a2ed25b9797..dde36e19f652 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -48,7 +48,7 @@ static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
 					     struct sk_buff *skb)
 {
 	struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
-	struct nci_conn_info	*conn_info;
+	struct nci_conn_info *conn_info;
 	int i;
 
 	pr_debug("num_entries %d\n", ntf->num_entries);
@@ -528,7 +528,7 @@ static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 					     const struct sk_buff *skb)
 {
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 	struct nci_rf_intf_activated_ntf ntf;
 	const __u8 *data = skb->data;
 	int err = NCI_STATUS_OK;
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index ebed2a7a0071..8539a39a8e1d 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -185,7 +185,7 @@ static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev,
 				   const struct sk_buff *skb)
 {
-	struct nci_conn_info    *conn_info;
+	struct nci_conn_info *conn_info;
 	__u8 status = skb->data[0];
 
 	pr_debug("status 0x%x\n", status);
-- 
2.27.0
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[linux-nfc] Re: [PATCH v2 7/8] nfc: hci: pass callback data param as pointer in nci_request()

[Krzysztof Kozlowski]

On 30/07/2021 15:49, Jakub Kicinski wrote:
> On Fri, 30 Jul 2021 08:56:24 +0200 Krzysztof Kozlowski wrote:
>> The nci_request() receives a callback function and unsigned long data
>> argument "opt" which is passed to the callback.  Almost all of the
>> nci_request() callers pass pointer to a stack variable as data argument.
>> Only few pass scalar value (e.g. u8).
>>
>> All such callbacks do not modify passed data argument and in previous
>> commit they were made as const.  However passing pointers via unsigned
>> long removes the const annotation.  The callback could simply cast
>> unsigned long to a pointer to writeable memory.
>>
>> Use "const void *" as type of this "opt" argument to solve this and
>> prevent modifying the pointed contents.  This is also consistent with
>> generic pattern of passing data arguments - via "void *".  In few places
>> passing scalar values, use casts via "unsigned long" to suppress any
>> warnings.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> 
> This generates a bunch of warnings:
> 
> net/nfc/nci/core.c:381:51: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:388:50: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:494:57: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:520:65: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:570:44: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:815:34: warning: Using plain integer as NULL pointer
> net/nfc/nci/core.c:856:50: warning: Using plain integer as NULL pointer

Indeed. Not that code before was better - the logic was exactly the
same. I might think more how to avoid these and maybe pass pointer to
stack value (like in other cases).

The 7/8 and 8/8 could be skipped in such case.

> 
> BTW applying this set will resolve the warnings introduced by applying
> "part 2" out of order, right? No further action needed?

Yes, it will resolve all warnings. No further action needed, at least I
am not aware of any new issues.

Best regards,
Krzysztof
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[linux-nfc] Re: [PATCH v2 7/8] nfc: hci: pass callback data param as pointer in nci_request()

[Krzysztof Kozlowski]

On 30/07/2021 15:58, Jakub Kicinski wrote:
> On Fri, 30 Jul 2021 15:56:19 +0200 Krzysztof Kozlowski wrote:
>> On 30/07/2021 15:49, Jakub Kicinski wrote:
>>> This generates a bunch of warnings:
>>>
>>> net/nfc/nci/core.c:381:51: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:388:50: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:494:57: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:520:65: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:570:44: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:815:34: warning: Using plain integer as NULL pointer
>>> net/nfc/nci/core.c:856:50: warning: Using plain integer as NULL pointer  
>>
>> Indeed. Not that code before was better - the logic was exactly the
>> same. I might think more how to avoid these and maybe pass pointer to
>> stack value (like in other cases).
>>
>> The 7/8 and 8/8 could be skipped in such case.
> 
> We don't usually take parts of series, would you mind resending first 6
> or respinning with the warnings addressed?

Sure, no problem.


Best regards,
Krzysztof
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