Bluetooth: Defer SCO setup if mode change is pending

Certain headsets such as the Motorola H350 will reject SCO and eSCO
connection requests while the ACL is transitioning from sniff mode
to active mode. Add synchronization so that SCO and eSCO connection
requests will wait until the ACL has fully transitioned to active mode.

< HCI Command: Exit Sniff Mode (0x02|0x0004) plen 2
    handle 12
> HCI Event: Command Status (0x0f) plen 4
    Exit Sniff Mode (0x02|0x0004) status 0x00 ncmd 1
< HCI Command:  Setup Synchronous Connection (0x01|0x0028) plen 17
    handle 12 voice setting 0x0040
> HCI Event: Command Status (0x0f) plen 4
    Setup Synchronous Connection (0x01|0x0028) status 0x00 ncmd 1
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 12 packets 1
> HCI Event: Mode Change (0x14) plen 6
    status 0x00 handle 12 mode 0x00 interval 0
    Mode: Active
> HCI Event: Synchronous Connect Complete (0x2c) plen 17
    status 0x10 handle 14 bdaddr 00:1A:0E:50:28:A4 type SCO
    Error: Connection Accept Timeout Exceeded

Signed-off-by: Ron Shaffer <rshaffer@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 15 insertions, 16 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 2069c3b05fda..bfef5bae0b3a 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -785,9 +785,13 @@ static void hci_cs_sniff_mode(struct hci_dev *hdev, __u8 status)
 	hci_dev_lock(hdev);
 
 	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
-	if (conn)
+	if (conn) {
 		clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
 
+		if (test_and_clear_bit(HCI_CONN_SCO_SETUP_PEND, &conn->pend))
+			hci_sco_setup(conn, status);
+	}
+
 	hci_dev_unlock(hdev);
 }
 
@@ -808,9 +812,13 @@ static void hci_cs_exit_sniff_mode(struct hci_dev *hdev, __u8 status)
 	hci_dev_lock(hdev);
 
 	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
-	if (conn)
+	if (conn) {
 		clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
 
+		if (test_and_clear_bit(HCI_CONN_SCO_SETUP_PEND, &conn->pend))
+			hci_sco_setup(conn, status);
+	}
+
 	hci_dev_unlock(hdev);
 }
 
@@ -915,20 +923,8 @@ static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 	} else
 		conn->state = BT_CLOSED;
 
-	if (conn->type == ACL_LINK) {
-		struct hci_conn *sco = conn->link;
-		if (sco) {
-			if (!ev->status) {
-				if (lmp_esco_capable(hdev))
-					hci_setup_sync(sco, conn->handle);
-				else
-					hci_add_sco(sco, conn->handle);
-			} else {
-				hci_proto_connect_cfm(sco, ev->status);
-				hci_conn_del(sco);
-			}
-		}
-	}
+	if (conn->type == ACL_LINK)
+		hci_sco_setup(conn, ev->status);
 
 	if (ev->status) {
 		hci_proto_connect_cfm(conn, ev->status);
@@ -1481,6 +1477,9 @@ static inline void hci_mode_change_evt(struct hci_dev *hdev, struct sk_buff *skb
 			else
 				conn->power_save = 0;
 		}
+
+		if (test_and_clear_bit(HCI_CONN_SCO_SETUP_PEND, &conn->pend))
+			hci_sco_setup(conn, ev->status);
 	}
 
 	hci_dev_unlock(hdev);