Bluetooth: Add discovery state tracking

This patch adds proper state tracking to the device discovery process.
This makes it possible to return appropriate errors when trying to stop
a non-active discovery or start discovery when it is already ongoing.
Once name resolving is implemented this also makes it possible to know
what the right action to do is when a remote name lookup is cancelled.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 5a566fd5e2a6..2f19de4770b6 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -57,6 +57,12 @@ struct inquiry_entry {
 };
 
 struct discovery_state {
+	enum {
+		DISCOVERY_STOPPED,
+		DISCOVERY_STARTING,
+		DISCOVERY_ACTIVE,
+		DISCOVERY_STOPPING,
+	} state;
 	struct list_head all;		/* All devices found during inquiry */
 	struct list_head unknown;	/* Name state not known */
 	struct list_head resolve;	/* Name needs to be resolved */
@@ -359,11 +365,14 @@ extern int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb);
 
 static inline void discovery_init(struct hci_dev *hdev)
 {
+	hdev->discovery.state = DISCOVERY_STOPPED;
 	INIT_LIST_HEAD(&hdev->discovery.all);
 	INIT_LIST_HEAD(&hdev->discovery.unknown);
 	INIT_LIST_HEAD(&hdev->discovery.resolve);
 }
 
+void hci_discovery_set_state(struct hci_dev *hdev, int state);
+
 static inline int inquiry_cache_empty(struct hci_dev *hdev)
 {
 	return list_empty(&hdev->discovery.all);