NFC: Clearly separate NCI states from flags

Make a clear separation between NCI states and flags.
This is required in order to support more NCI states (e.g.
for multiple targets support).

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 22 insertions, 16 deletions

diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index 9154663b606b..b9c3f8de13dd 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -34,16 +34,21 @@
 #include <net/nfc/nfc.h>
 #include <net/nfc/nci.h>
 
-/* NCI device state */
-enum {
+/* NCI device flags */
+enum nci_flag {
         NCI_INIT,
         NCI_UP,
-        NCI_DISCOVERY,
-        NCI_POLL_ACTIVE,
         NCI_DATA_EXCHANGE,
         NCI_DATA_EXCHANGE_TO,
 };
 
+/* NCI device states */
+enum nci_state {
+        NCI_IDLE,
+        NCI_DISCOVERY,
+        NCI_POLL_ACTIVE,
+};
+
 /* NCI timeouts */
 #define NCI_RESET_TIMEOUT                       5000
 #define NCI_INIT_TIMEOUT                        5000
@@ -70,6 +75,7 @@ struct nci_dev {
         int                     tx_headroom;
         int                     tx_tailroom;
 
+        atomic_t                state;
         unsigned long           flags;
 
         atomic_t                cmd_cnt;
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 815d28a0ed9d..629b76845973 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -264,6 +264,7 @@ static int nci_open_device(struct nci_dev *ndev)
 
         if (!rc) {
                 set_bit(NCI_UP, &ndev->flags);
+                atomic_set(&ndev->state, NCI_IDLE);
         } else {
                 /* Init failed, cleanup */
                 skb_queue_purge(&ndev->cmd_q);
@@ -360,7 +361,7 @@ static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
         int rc;
 
-        if (test_bit(NCI_DISCOVERY, &ndev->flags)) {
+        if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
                 pr_err("unable to start poll, since poll is already active\n");
                 return -EBUSY;
         }
@@ -370,7 +371,7 @@ static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
                 return -EBUSY;
         }
 
-        if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
+        if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
                 pr_debug("target is active, implicitly deactivate...\n");
 
                 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
@@ -392,7 +393,7 @@ static void nci_stop_poll(struct nfc_dev *nfc_dev)
 {
         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 
-        if (!test_bit(NCI_DISCOVERY, &ndev->flags)) {
+        if (atomic_read(&ndev->state) != NCI_DISCOVERY) {
                 pr_err("unable to stop poll, since poll is not active\n");
                 return;
         }
@@ -408,7 +409,7 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 
         pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol);
 
-        if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
+        if (atomic_read(&ndev->state) != NCI_POLL_ACTIVE) {
                 pr_err("there is no available target to activate\n");
                 return -EINVAL;
         }
@@ -443,7 +444,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
 
         ndev->target_active_prot = 0;
 
-        if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
+        if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
                 nci_request(ndev, nci_rf_deactivate_req, 0,
                         msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
         }
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index a88be91e973f..8ec39464cea5 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -261,8 +261,7 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
         __u8 *data = skb->data;
         int err = 0;
 
-        clear_bit(NCI_DISCOVERY, &ndev->flags);
-        set_bit(NCI_POLL_ACTIVE, &ndev->flags);
+        atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 
         ntf.rf_discovery_id = *data++;
         ntf.rf_interface = *data++;
@@ -350,7 +349,7 @@ static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 
         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 
-        clear_bit(NCI_POLL_ACTIVE, &ndev->flags);
+        atomic_set(&ndev->state, NCI_IDLE);
         ndev->target_active_prot = 0;
 
         /* drop tx data queue */
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index 3c73e92eb625..cb8bce6899cf 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -137,7 +137,7 @@ static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
         pr_debug("status 0x%x\n", status);
 
         if (status == NCI_STATUS_OK)
-                set_bit(NCI_DISCOVERY, &ndev->flags);
+                atomic_set(&ndev->state, NCI_DISCOVERY);
 
         nci_req_complete(ndev, status);
 }
@@ -149,12 +149,12 @@ static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 
         pr_debug("status 0x%x\n", status);
 
-        clear_bit(NCI_DISCOVERY, &ndev->flags);
-
         /* If target was active, complete the request only in deactivate_ntf */
         if ((status != NCI_STATUS_OK) ||
-                (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)))
+                (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
+                atomic_set(&ndev->state, NCI_IDLE);
                 nci_req_complete(ndev, status);
+        }
 }
 
 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)