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Bluetooth: Convert hci_cb_list_lock to a mutex

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We'll soon need to be able to sleep inside the loops that iterate the
hci_cb list, so neither a spinlock, rwlock or rcu are usable. This patch
changes the lock to a mutex which permits sleeping while holding the
lock.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2015-02-18 14:53:55 +02:00 committed by Marcel Holtmann
parent 00629e0fd5
commit fba7ecf09b
2 changed files with 14 additions and 14 deletions
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18
include/net/bluetooth/hci_core.h
View File

@ -499,7 +499,7 @@ struct hci_conn_params {
extern struct list_head hci_dev_list;
extern struct list_head hci_cb_list;
extern rwlock_t hci_dev_list_lock;
extern rwlock_t hci_cb_list_lock;
extern struct mutex hci_cb_list_lock;
/* ----- HCI interface to upper protocols ----- */
int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr);
@ -1160,12 +1160,12 @@ static inline void hci_auth_cfm(struct hci_conn *conn, __u8 status)
encrypt = test_bit(HCI_CONN_ENCRYPT, &conn->flags) ? 0x01 : 0x00;
read_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_for_each_entry(cb, &hci_cb_list, list) {
if (cb->security_cfm)
cb->security_cfm(conn, status, encrypt);
}
read_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
}
static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status,
@ -1181,24 +1181,24 @@ static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status,
hci_proto_encrypt_cfm(conn, status, encrypt);
read_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_for_each_entry(cb, &hci_cb_list, list) {
if (cb->security_cfm)
cb->security_cfm(conn, status, encrypt);
}
read_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
}
static inline void hci_key_change_cfm(struct hci_conn *conn, __u8 status)
{
struct hci_cb *cb;
read_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_for_each_entry(cb, &hci_cb_list, list) {
if (cb->key_change_cfm)
cb->key_change_cfm(conn, status);
}
read_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
}
static inline void hci_role_switch_cfm(struct hci_conn *conn, __u8 status,
@ -1206,12 +1206,12 @@ static inline void hci_role_switch_cfm(struct hci_conn *conn, __u8 status,
{
struct hci_cb *cb;
read_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_for_each_entry(cb, &hci_cb_list, list) {
if (cb->role_switch_cfm)
cb->role_switch_cfm(conn, status, role);
}
read_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
}
static inline bool eir_has_data_type(u8 *data, size_t data_len, u8 type)

10
net/bluetooth/hci_core.c
View File

@ -51,7 +51,7 @@ DEFINE_RWLOCK(hci_dev_list_lock);
/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_RWLOCK(hci_cb_list_lock);
DEFINE_MUTEX(hci_cb_list_lock);
/* HCI ID Numbering */
static DEFINE_IDA(hci_index_ida);
@ -3464,9 +3464,9 @@ int hci_register_cb(struct hci_cb *cb)
{
BT_DBG("%p name %s", cb, cb->name);
write_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_add_tail(&cb->list, &hci_cb_list);
write_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
return 0;
}
@ -3476,9 +3476,9 @@ int hci_unregister_cb(struct hci_cb *cb)
{
BT_DBG("%p name %s", cb, cb->name);
write_lock(&hci_cb_list_lock);
mutex_lock(&hci_cb_list_lock);
list_del(&cb->list);
write_unlock(&hci_cb_list_lock);
mutex_unlock(&hci_cb_list_lock);
return 0;
}