NFC: Cache the core NFC active target pointer instead of its index

The NFC Core now caches the active nfc target pointer, thereby avoiding
the need to lookup the target table for each invocation of a driver ops.
Consequently, pn533, HCI and NCI now directly receive an nfc_target
pointer instead of a target index.

Cc: Ilan Elias <ilane@ti.com>
Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 14 insertions, 13 deletions

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 8737c20..d560e6f 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -436,16 +436,16 @@ static void nci_stop_poll(struct nfc_dev *nfc_dev)
 		    msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 }
 
-static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
-			       __u32 protocol)
+static int nci_activate_target(struct nfc_dev *nfc_dev,
+			       struct nfc_target *target, __u32 protocol)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 	struct nci_rf_discover_select_param param;
-	struct nfc_target *target = NULL;
+	struct nfc_target *nci_target = NULL;
 	int i;
 	int rc = 0;
 
-	pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol);
+	pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
 
 	if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
 	    (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
@@ -459,25 +459,25 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 	}
 
 	for (i = 0; i < ndev->n_targets; i++) {
-		if (ndev->targets[i].idx == target_idx) {
-			target = &ndev->targets[i];
+		if (ndev->targets[i].idx == target->idx) {
+			nci_target = &ndev->targets[i];
 			break;
 		}
 	}
 
-	if (!target) {
+	if (!nci_target) {
 		pr_err("unable to find the selected target\n");
 		return -EINVAL;
 	}
 
-	if (!(target->supported_protocols & (1 << protocol))) {
+	if (!(nci_target->supported_protocols & (1 << protocol))) {
 		pr_err("target does not support the requested protocol 0x%x\n",
 		       protocol);
 		return -EINVAL;
 	}
 
 	if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
-		param.rf_discovery_id = target->logical_idx;
+		param.rf_discovery_id = nci_target->logical_idx;
 
 		if (protocol == NFC_PROTO_JEWEL)
 			param.rf_protocol = NCI_RF_PROTOCOL_T1T;
@@ -501,11 +501,12 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 	return rc;
 }
 
-static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
+static void nci_deactivate_target(struct nfc_dev *nfc_dev,
+				  struct nfc_target *target)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 
-	pr_debug("target_idx %d\n", target_idx);
+	pr_debug("target_idx %d\n", target->idx);
 
 	if (!ndev->target_active_prot) {
 		pr_err("unable to deactivate target, no active target\n");
@@ -520,14 +521,14 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
 	}
 }
 
-static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
+static int nci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
 			     struct sk_buff *skb,
 			     data_exchange_cb_t cb, void *cb_context)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 	int rc;
 
-	pr_debug("target_idx %d, len %d\n", target_idx, skb->len);
+	pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
 
 	if (!ndev->target_active_prot) {
 		pr_err("unable to exchange data, no active target\n");