Bluetooth: Remove global mutex hci_task_lock
The hci_task_lock mutex (previously a lock) was supposed to protect the
register/unregister of HCI protocols against RX/TX tasks. This will not
be needed anymore because SCO and L2CAP will always be compiled.
Moreover, with the recent move of RX/TX to workqueues per device the
global hci_task_lock was causing starvation between different HCI
devices.
Signed-off-by: Ulisses Furquim <ulisses@profusion.mobi>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 884eb85..fea8dad 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -61,8 +61,6 @@
static void hci_cmd_work(struct work_struct *work);
static void hci_tx_work(struct work_struct *work);
-static DEFINE_MUTEX(hci_task_lock);
-
/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);
@@ -1832,8 +1830,7 @@
/* ---- Interface to upper protocols ---- */
-/* Register/Unregister protocols.
- * hci_task_lock is used to ensure that no tasks are running. */
+/* Register/Unregister protocols. */
int hci_register_proto(struct hci_proto *hp)
{
int err = 0;
@@ -1843,15 +1840,11 @@
if (hp->id >= HCI_MAX_PROTO)
return -EINVAL;
- mutex_lock(&hci_task_lock);
-
if (!hci_proto[hp->id])
hci_proto[hp->id] = hp;
else
err = -EEXIST;
- mutex_unlock(&hci_task_lock);
-
return err;
}
EXPORT_SYMBOL(hci_register_proto);
@@ -1865,15 +1858,11 @@
if (hp->id >= HCI_MAX_PROTO)
return -EINVAL;
- mutex_lock(&hci_task_lock);
-
if (hci_proto[hp->id])
hci_proto[hp->id] = NULL;
else
err = -ENOENT;
- mutex_unlock(&hci_task_lock);
-
return err;
}
EXPORT_SYMBOL(hci_unregister_proto);
@@ -2439,8 +2428,6 @@
struct hci_dev *hdev = container_of(work, struct hci_dev, tx_work);
struct sk_buff *skb;
- mutex_lock(&hci_task_lock);
-
BT_DBG("%s acl %d sco %d le %d", hdev->name, hdev->acl_cnt,
hdev->sco_cnt, hdev->le_cnt);
@@ -2457,8 +2444,6 @@
/* Send next queued raw (unknown type) packet */
while ((skb = skb_dequeue(&hdev->raw_q)))
hci_send_frame(skb);
-
- mutex_unlock(&hci_task_lock);
}
/* ----- HCI RX task (incoming data processing) ----- */
@@ -2546,8 +2531,6 @@
BT_DBG("%s", hdev->name);
- mutex_lock(&hci_task_lock);
-
while ((skb = skb_dequeue(&hdev->rx_q))) {
if (atomic_read(&hdev->promisc)) {
/* Send copy to the sockets */
@@ -2591,8 +2574,6 @@
break;
}
}
-
- mutex_unlock(&hci_task_lock);
}
static void hci_cmd_work(struct work_struct *work)
