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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>
This commit is contained in:
Ulisses Furquim 2011-12-20 17:10:51 -02:00 committed by Gustavo F. Padovan
parent fa0fb93f2a
commit f2d64f6aa6
1 changed files with 1 additions and 20 deletions
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21
net/bluetooth/hci_core.c
View File

@ -61,8 +61,6 @@ static void hci_rx_work(struct work_struct *work);
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 @@ EXPORT_SYMBOL(hci_recv_stream_fragment);
/* ---- 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 @@ int hci_register_proto(struct hci_proto *hp)
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 @@ int hci_unregister_proto(struct hci_proto *hp)
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 @@ static void hci_tx_work(struct work_struct *work)
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 @@ static void hci_tx_work(struct work_struct *work)
/* 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 @@ static void hci_rx_work(struct work_struct *work)
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 @@ static void hci_rx_work(struct work_struct *work)
break;
}
}
mutex_unlock(&hci_task_lock);
}
static void hci_cmd_work(struct work_struct *work)