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From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Charles Gorand <charles.gorand@effinnov.com>,
	Krzysztof Opasiak <k.opasiak@samsung.com>,
	Mark Greer <mgreer@animalcreek.com>,
	Bongsu Jeon <bongsu.jeon@samsung.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, linux-wireless@vger.kernel.org
Subject: [PATCH 02/12] nfc: constify nci_ops
Date: Sat, 24 Jul 2021 23:47:33 +0200	[thread overview]
Message-ID: <20210724214743.121884-3-krzysztof.kozlowski@canonical.com> (raw)
In-Reply-To: <20210724214743.121884-1-krzysztof.kozlowski@canonical.com>

The struct nci_ops is modified by NFC core in only one case:
nci_allocate_device() receives too many proprietary commands (prop_ops)
to configure.  This is a build time known constrain, so a graceful
handling of such case is not necessary.

Instead, fail the nci_allocate_device() and add BUILD_BUG_ON() to places
which set these.

This allows to constify the struct nci_ops (consisting of function
pointers) for correctness and safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/nfc/fdp/fdp.c        | 3 ++-
 drivers/nfc/nfcmrvl/main.c   | 2 +-
 drivers/nfc/nxp-nci/core.c   | 2 +-
 drivers/nfc/st-nci/core.c    | 3 ++-
 drivers/nfc/virtual_ncidev.c | 2 +-
 include/net/nfc/nci_core.h   | 4 ++--
 net/nfc/nci/core.c           | 5 ++---
 7 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/nfc/fdp/fdp.c b/drivers/nfc/fdp/fdp.c
index 528745862738..73f51848a693 100644
--- a/drivers/nfc/fdp/fdp.c
+++ b/drivers/nfc/fdp/fdp.c
@@ -675,7 +675,7 @@ static struct nci_driver_ops fdp_prop_ops[] = {
 	},
 };
 
-static struct nci_ops nci_ops = {
+static const struct nci_ops nci_ops = {
 	.open = fdp_nci_open,
 	.close = fdp_nci_close,
 	.send = fdp_nci_send,
@@ -718,6 +718,7 @@ int fdp_nci_probe(struct fdp_i2c_phy *phy, struct nfc_phy_ops *phy_ops,
 		    NFC_PROTO_NFC_DEP_MASK |
 		    NFC_PROTO_ISO15693_MASK;
 
+	BUILD_BUG_ON(ARRAY_SIZE(fdp_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
 	ndev = nci_allocate_device(&nci_ops, protocols, tx_headroom,
 				   tx_tailroom);
 	if (!ndev) {
diff --git a/drivers/nfc/nfcmrvl/main.c b/drivers/nfc/nfcmrvl/main.c
index a4620b480c4f..6e9e7ce8792c 100644
--- a/drivers/nfc/nfcmrvl/main.c
+++ b/drivers/nfc/nfcmrvl/main.c
@@ -81,7 +81,7 @@ static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
 	return nfcmrvl_fw_dnld_start(ndev, firmware_name);
 }
 
-static struct nci_ops nfcmrvl_nci_ops = {
+static const struct nci_ops nfcmrvl_nci_ops = {
 	.open = nfcmrvl_nci_open,
 	.close = nfcmrvl_nci_close,
 	.send = nfcmrvl_nci_send,
diff --git a/drivers/nfc/nxp-nci/core.c b/drivers/nfc/nxp-nci/core.c
index 2b0c7232e91f..518e2afb43a8 100644
--- a/drivers/nfc/nxp-nci/core.c
+++ b/drivers/nfc/nxp-nci/core.c
@@ -83,7 +83,7 @@ static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 	return r;
 }
 
-static struct nci_ops nxp_nci_ops = {
+static const struct nci_ops nxp_nci_ops = {
 	.open = nxp_nci_open,
 	.close = nxp_nci_close,
 	.send = nxp_nci_send,
diff --git a/drivers/nfc/st-nci/core.c b/drivers/nfc/st-nci/core.c
index 110ff1281e5f..f6fce34a77da 100644
--- a/drivers/nfc/st-nci/core.c
+++ b/drivers/nfc/st-nci/core.c
@@ -94,7 +94,7 @@ static struct nci_driver_ops st_nci_prop_ops[] = {
 	},
 };
 
-static struct nci_ops st_nci_ops = {
+static const struct nci_ops st_nci_ops = {
 	.init = st_nci_init,
 	.open = st_nci_open,
 	.close = st_nci_close,
@@ -131,6 +131,7 @@ int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
 		| NFC_PROTO_ISO15693_MASK
 		| NFC_PROTO_NFC_DEP_MASK;
 
+	BUILD_BUG_ON(ARRAY_SIZE(st_nci_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
 	ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
 					phy_headroom, phy_tailroom);
 	if (!ndlc->ndev) {
diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c
index f73ee0bf3593..b914ab2c2109 100644
--- a/drivers/nfc/virtual_ncidev.c
+++ b/drivers/nfc/virtual_ncidev.c
@@ -65,7 +65,7 @@ static int virtual_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 	return 0;
 }
 
-static struct nci_ops virtual_nci_ops = {
+static const struct nci_ops virtual_nci_ops = {
 	.open = virtual_nci_open,
 	.close = virtual_nci_close,
 	.send = virtual_nci_send
diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index bf573eca07ca..5dae7e2cbc49 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -194,7 +194,7 @@ struct nci_hci_dev {
 /* NCI Core structures */
 struct nci_dev {
 	struct nfc_dev		*nfc_dev;
-	struct nci_ops		*ops;
+	const struct nci_ops	*ops;
 	struct nci_hci_dev	*hci_dev;
 
 	int			tx_headroom;
@@ -267,7 +267,7 @@ struct nci_dev {
 };
 
 /* ----- NCI Devices ----- */
-struct nci_dev *nci_allocate_device(struct nci_ops *ops,
+struct nci_dev *nci_allocate_device(const struct nci_ops *ops,
 				    __u32 supported_protocols,
 				    int tx_headroom,
 				    int tx_tailroom);
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 09967b836361..a7d26f2791b0 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1129,7 +1129,7 @@ static struct nfc_ops nci_nfc_ops = {
  * @tx_headroom: Reserved space at beginning of skb
  * @tx_tailroom: Reserved space at end of skb
  */
-struct nci_dev *nci_allocate_device(struct nci_ops *ops,
+struct nci_dev *nci_allocate_device(const struct nci_ops *ops,
 				    __u32 supported_protocols,
 				    int tx_headroom, int tx_tailroom)
 {
@@ -1152,8 +1152,7 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 	if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
 		pr_err("Too many proprietary commands: %zd\n",
 		       ops->n_prop_ops);
-		ops->prop_ops = NULL;
-		ops->n_prop_ops = 0;
+		goto free_nci;
 	}
 
 	ndev->tx_headroom = tx_headroom;
-- 
2.27.0


  parent reply	other threads:[~2021-07-24 21:48 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-24 21:47 [PATCH 00/12] nfc: constify data structures Krzysztof Kozlowski
2021-07-24 21:47 ` [PATCH 01/12] nfc: constify payload argument in nci_send_cmd() Krzysztof Kozlowski
2021-07-24 21:47 ` Krzysztof Kozlowski [this message]
2021-07-24 21:47 ` [PATCH 03/12] nfc: s3fwrn5: constify nci_ops Krzysztof Kozlowski
2021-07-24 21:47 ` [PATCH 04/12] nfc: constify nci_driver_ops (prop_ops and core_ops) Krzysztof Kozlowski
2021-07-24 21:47 ` [PATCH 05/12] nfc: constify nfc_phy_ops Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 06/12] nfc: st21nfca: constify file-scope arrays Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 07/12] nfc: constify pointer to nfc_vendor_cmd Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 08/12] nfc: constify nfc_hci_gate Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 09/12] nfc: constify nfc_ops Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 10/12] nfc: constify nfc_hci_ops Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 11/12] nfc: constify nfc_llc_ops Krzysztof Kozlowski
2021-07-24 21:49 ` [PATCH 12/12] nfc: constify nfc_digital_ops Krzysztof Kozlowski
2021-07-25  8:30 ` [PATCH 00/12] nfc: constify data structures patchwork-bot+netdevbpf

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