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Bluetooth: Add public l2cap_conn_shutdown() API to request disconnection

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Since we no-longer do special handling of SMP within l2cap_core.c we
don't have any code for calling l2cap_conn_del() when smp.c doesn't like
the data it gets. At the same time we cannot simply export
l2cap_conn_del() since it will try to lock the channels it calls into
whereas we already hold the lock in the smp.c l2cap_chan callbacks (i.e.
it'd lead to a deadlock).

This patch adds a new l2cap_conn_shutdown() API which is very similar to
l2cap_conn_del() except that it defers the call to l2cap_conn_del()
through a workqueue, thereby making it safe to use it from an L2CAP
channel callback.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-08-11 22:06:37 +03:00 committed by Marcel Holtmann
parent 44f1a7ab51
commit dec5b49235
2 changed files with 29 additions and 0 deletions
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4
include/net/bluetooth/l2cap.h
View file

@ -625,6 +625,9 @@ struct l2cap_conn {
struct delayed_work info_timer;
int disconn_err;
struct work_struct disconn_work;
struct sk_buff *rx_skb;
__u32 rx_len;
__u8 tx_ident;
@ -944,6 +947,7 @@ void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
u8 status);
void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
void l2cap_conn_shutdown(struct l2cap_conn *conn, int err);
void l2cap_conn_get(struct l2cap_conn *conn);
void l2cap_conn_put(struct l2cap_conn *conn);

25
net/bluetooth/l2cap_core.c
View file

@ -1627,6 +1627,9 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
if (work_pending(&conn->pending_rx_work))
cancel_work_sync(&conn->pending_rx_work);
if (work_pending(&conn->disconn_work))
cancel_work_sync(&conn->disconn_work);
l2cap_unregister_all_users(conn);
mutex_lock(&conn->chan_lock);
@ -1669,6 +1672,26 @@ static void security_timeout(struct work_struct *work)
}
}
static void disconn_work(struct work_struct *work)
{
struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
disconn_work);
BT_DBG("conn %p", conn);
l2cap_conn_del(conn->hcon, conn->disconn_err);
}
void l2cap_conn_shutdown(struct l2cap_conn *conn, int err)
{
struct hci_dev *hdev = conn->hcon->hdev;
BT_DBG("conn %p err %d", conn, err);
conn->disconn_err = err;
queue_work(hdev->workqueue, &conn->disconn_work);
}
static void l2cap_conn_free(struct kref *ref)
{
struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
@ -6930,6 +6953,8 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
else
INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
INIT_WORK(&conn->disconn_work, disconn_work);
skb_queue_head_init(&conn->pending_rx);
INIT_WORK(&conn->pending_rx_work, process_pending_rx);