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Bluetooth: Let HIDP grab the device reference for connections 

The core exports the hci_conn_hold_device() and hci_conn_put_device()
functions for device reference of connections. Use this to ensure that
the uevents from the parent are send after the child ones.

Based on a report by Brian Rogers <brian@xyzw.org>

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2009-08-22 14:22:15 -07:00
parent 9eba32b86d
commit edad638869
2 changed files with 43 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
net/bluetooth/hidp/core.c
View File

@ -93,10 +93,14 @@ static void __hidp_link_session(struct hidp_session *session)
{
__module_get(THIS_MODULE);
list_add(&session->list, &hidp_session_list);
hci_conn_hold_device(session->conn);
}
static void __hidp_unlink_session(struct hidp_session *session)
{
hci_conn_put_device(session->conn);
list_del(&session->list);
module_put(THIS_MODULE);
}
@ -577,7 +581,9 @@ static int hidp_session(void *arg)
hidinput_disconnect(session->hid);
if (session->hid->claimed & HID_CLAIMED_HIDRAW)
hidraw_disconnect(session->hid);
hid_destroy_device(session->hid);
session->hid = NULL;
}
/* Wakeup user-space polling for socket errors */
@ -605,25 +611,27 @@ static struct device *hidp_get_device(struct hidp_session *session)
{
bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src;
bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst;
struct device *device = NULL;
struct hci_dev *hdev;
struct hci_conn *conn;
hdev = hci_get_route(dst, src);
if (!hdev)
return NULL;
conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
session->conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
if (session->conn)
device = &session->conn->dev;
hci_dev_put(hdev);
return conn ? &conn->dev : NULL;
return device;
}
static int hidp_setup_input(struct hidp_session *session,
struct hidp_connadd_req *req)
{
struct input_dev *input;
int i;
int err, i;
input = input_allocate_device();
if (!input)
@ -670,7 +678,13 @@ static int hidp_setup_input(struct hidp_session *session,
input->event = hidp_input_event;
return input_register_device(input);
err = input_register_device(input);
if (err < 0) {
hci_conn_put_device(session->conn);
return err;
}
return 0;
}
static int hidp_open(struct hid_device *hid)
@ -752,13 +766,11 @@ static int hidp_setup_hid(struct hidp_session *session,
{
struct hid_device *hid;
bdaddr_t src, dst;
int ret;
int err;
hid = hid_allocate_device();
if (IS_ERR(hid)) {
ret = PTR_ERR(session->hid);
goto err;
}
if (IS_ERR(hid))
return PTR_ERR(session->hid);
session->hid = hid;
session->req = req;
@ -780,16 +792,17 @@ static int hidp_setup_hid(struct hidp_session *session,
hid->dev.parent = hidp_get_device(session);
hid->ll_driver = &hidp_hid_driver;
ret = hid_add_device(hid);
if (ret)
goto err_hid;
err = hid_add_device(hid);
if (err < 0)
goto failed;
return 0;
err_hid:
failed:
hid_destroy_device(hid);
session->hid = NULL;
err:
return ret;
return err;
}
int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock)
@ -839,13 +852,13 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock,
if (req->rd_size > 0) {
err = hidp_setup_hid(session, req);
if (err && err != -ENODEV)
goto err_skb;
goto purge;
}
if (!session->hid) {
err = hidp_setup_input(session, req);
if (err < 0)
goto err_skb;
goto purge;
}
__hidp_link_session(session);
@ -873,13 +886,20 @@ unlink:
__hidp_unlink_session(session);
if (session->input)
if (session->input) {
input_unregister_device(session->input);
if (session->hid)
session->input = NULL;
}
if (session->hid) {
hid_destroy_device(session->hid);
err_skb:
session->hid = NULL;
}
purge:
skb_queue_purge(&session->ctrl_transmit);
skb_queue_purge(&session->intr_transmit);
failed:
up_write(&hidp_session_sem);

2
net/bluetooth/hidp/hidp.h
View File

@ -126,6 +126,8 @@ int hidp_get_conninfo(struct hidp_conninfo *ci);
struct hidp_session {
struct list_head list;
struct hci_conn *conn;
struct socket *ctrl_sock;
struct socket *intr_sock;