Systematically removing the LE connection parameters and autoconnect
action is inconvenient for rebonding without disconnecting from
userland (i.e. unpairing followed by repairing without
disconnecting). The parameters will be lost after unparing and
userland needs to take care of book-keeping them and re-adding them.
This patch allows userland to forget about parameter management when
rebonding without disconnecting. It defers clearing the connection
parameters when unparing without disconnecting, giving a chance of
keeping the parameters if a repairing happens before the connection is
closed.
Signed-off-by: Alfonso Acosta <fons@xxxxxxxxxxx>
---
include/net/bluetooth/hci_core.h | 1 +
net/bluetooth/hci_conn.c | 6 ++++++
net/bluetooth/mgmt.c | 16 +++++++++++++---
3 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 07ddeed62..b8685a7 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -555,6 +555,7 @@ enum {
HCI_CONN_STK_ENCRYPT,
HCI_CONN_AUTH_INITIATOR,
HCI_CONN_DROP,
+ HCI_CONN_PARAM_REMOVAL_PEND,
};
static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index b9517bd..d106f29 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -356,6 +356,9 @@ static void hci_conn_timeout(struct work_struct *work)
conn->state = BT_CLOSED;
break;
}
+
+ if (test_and_clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags))
+ hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
}
/* Enter sniff mode */
@@ -544,6 +547,9 @@ int hci_conn_del(struct hci_conn *conn)
hci_conn_del_sysfs(conn);
+ if (test_and_clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags))
+ hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
+
hci_dev_put(hdev);
hci_conn_put(conn);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 3fd88b0..0f2c0e9 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2700,6 +2700,7 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
struct hci_cp_disconnect dc;
struct pending_cmd *cmd;
struct hci_conn *conn;
+ struct hci_conn *le_conn = NULL;
int err;
memset(&rp, 0, sizeof(rp));
@@ -2736,7 +2737,17 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
hci_remove_irk(hdev, &cp->addr.bdaddr, addr_type);
- hci_conn_params_del(hdev, &cp->addr.bdaddr, addr_type);
+ le_conn = hci_conn_hash_lookup_ba(hdev, LE_LINK,
+ &cp->addr.bdaddr);
+
+ /* If the BLE connection is being used, defer clearing up
+ * the connection parameters until closing to give a
+ * chance of keeping them if a repairing happens.
+ */
+ if (le_conn && !cp->disconnect)
+ set_bit(HCI_CONN_PARAM_REMOVAL_PEND, &le_conn->flags);
+ else
+ hci_conn_params_del(hdev, &cp->addr.bdaddr, addr_type);
err = hci_remove_ltk(hdev, &cp->addr.bdaddr, addr_type);
}
@@ -2752,8 +2763,7 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK,
&cp->addr.bdaddr);
else
- conn = hci_conn_hash_lookup_ba(hdev, LE_LINK,
- &cp->addr.bdaddr);
+ conn = le_conn;
} else {
conn = NULL;
}
--
1.9.1
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