From: Eric Lapuyade <eric.lapuyade@linux.intel.com>
Date: Wed, 28 Nov 2012 14:48:44 +0000 (+0100)
Subject: NFC: Added error handling in event_received hci ops
X-Git-Tag: v3.12-rc1~1418^2~242^2^2~26^2~14
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=27c31191b3d7ff32c266a5dbea344b9aa96ebf14;p=kernel%2Fkernel-generic.git

NFC: Added error handling in event_received hci ops

There is no use to return an error if the caller doesn't get it.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---

diff --git a/drivers/nfc/pn544/pn544.c b/drivers/nfc/pn544/pn544.c
index cc666de..4af70f9 100644
--- a/drivers/nfc/pn544/pn544.c
+++ b/drivers/nfc/pn544/pn544.c
@@ -714,8 +714,8 @@ static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
 	return 0;
 }
 
-static void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate,
-					u8 event, struct sk_buff *skb)
+static int pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate, u8 event,
+				    struct sk_buff *skb)
 {
 	struct sk_buff *rgb_skb = NULL;
 	int r = 0;
@@ -724,25 +724,23 @@ static void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate,
 	switch (event) {
 	case PN544_HCI_EVT_ACTIVATED:
 		if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
-			nfc_hci_target_discovered(hdev, gate);
+			r = nfc_hci_target_discovered(hdev, gate);
 		else if (gate == PN544_RF_READER_NFCIP1_TARGET_GATE) {
 			r = nfc_hci_get_param(hdev, gate, PN544_DEP_ATR_REQ,
-						&rgb_skb);
-
+					      &rgb_skb);
 			if (r < 0)
 				goto exit;
 
-			nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
-					NFC_COMM_PASSIVE, rgb_skb->data,
-					rgb_skb->len);
+			r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
+					     NFC_COMM_PASSIVE, rgb_skb->data,
+					     rgb_skb->len);
 
 			kfree_skb(rgb_skb);
 		}
-
 		break;
 	case PN544_HCI_EVT_DEACTIVATED:
-		nfc_hci_send_event(hdev, gate,
-			NFC_HCI_EVT_END_OPERATION, NULL, 0);
+		r = nfc_hci_send_event(hdev, gate, NFC_HCI_EVT_END_OPERATION,
+				       NULL, 0);
 		break;
 	case PN544_HCI_EVT_RCV_DATA:
 		if (skb->len < 2) {
@@ -757,15 +755,16 @@ static void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate,
 		}
 
 		skb_pull(skb, 2);
-		nfc_tm_data_received(hdev->ndev, skb);
-
-		return;
+		return nfc_tm_data_received(hdev->ndev, skb);
 	default:
+		pr_err("Discarded unknown event %x to gate %x\n", event, gate);
 		break;
 	}
 
 exit:
 	kfree_skb(skb);
+
+	return r;
 }
 
 static struct nfc_hci_ops pn544_hci_ops = {
diff --git a/include/net/nfc/hci.h b/include/net/nfc/hci.h
index e622457..834e364 100644
--- a/include/net/nfc/hci.h
+++ b/include/net/nfc/hci.h
@@ -57,8 +57,8 @@ struct nfc_hci_ops {
 	int (*tm_send)(struct nfc_hci_dev *hdev, struct sk_buff *skb);
 	int (*check_presence)(struct nfc_hci_dev *hdev,
 			      struct nfc_target *target);
-	void (*event_received)(struct nfc_hci_dev *hdev, u8 gate, u8 event,
-				struct sk_buff *skb);
+	int (*event_received)(struct nfc_hci_dev *hdev, u8 gate, u8 event,
+			      struct sk_buff *skb);
 };
 
 /* Pipes */
diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
index b4b8426..f30f6fe 100644
--- a/net/nfc/hci/core.c
+++ b/net/nfc/hci/core.c
@@ -323,16 +323,18 @@ void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 		break;
 	default:
 		if (hdev->ops->event_received) {
-			hdev->ops->event_received(hdev, gate, event, skb);
-			return;
+			r = hdev->ops->event_received(hdev, gate, event, skb);
+			goto exit_noskb;
+		} else {
+			r = -EINVAL;
 		}
-
 		break;
 	}
 
 exit:
 	kfree_skb(skb);
 
+exit_noskb:
 	if (r) {
 		/* TODO: There was an error dispatching the event,
 		 * how to propagate up to nfc core?