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Bluetooth: Add a new workqueue for hci_request operations

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The hci_request function is blocking and cannot be called through the
usual per-HCI device workqueue (hdev->workqueue). While hci_request is
in progress any other work from the queue, including sending HCI
commands to the controller would be blocked and eventually cause the
hci_request call to time out.

This patch adds a second workqueue to be used by operations needing
hci_request and thereby avoiding issues with blocking other workqueue
users.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Johan Hedberg 2013-01-14 22:33:50 +02:00 committed by Gustavo Padovan
parent 52e0b011e2
commit 6ead1bbc38
2 changed files with 12 additions and 0 deletions
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1
include/net/bluetooth/hci_core.h
View File

@ -216,6 +216,7 @@ struct hci_dev {
unsigned long le_last_tx;
struct workqueue_struct *workqueue;
struct workqueue_struct *req_workqueue;
struct work_struct power_on;
struct delayed_work power_off;

11
net/bluetooth/hci_core.c
View File

@ -1799,6 +1799,15 @@ int hci_register_dev(struct hci_dev *hdev)
goto err;
}
hdev->req_workqueue = alloc_workqueue(hdev->name,
WQ_HIGHPRI | WQ_UNBOUND |
WQ_MEM_RECLAIM, 1);
if (!hdev->req_workqueue) {
destroy_workqueue(hdev->workqueue);
error = -ENOMEM;
goto err;
}
error = hci_add_sysfs(hdev);
if (error < 0)
goto err_wqueue;
@ -1827,6 +1836,7 @@ int hci_register_dev(struct hci_dev *hdev)
err_wqueue:
destroy_workqueue(hdev->workqueue);
destroy_workqueue(hdev->req_workqueue);
err:
ida_simple_remove(&hci_index_ida, hdev->id);
write_lock(&hci_dev_list_lock);
@ -1880,6 +1890,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
hci_del_sysfs(hdev);
destroy_workqueue(hdev->workqueue);
destroy_workqueue(hdev->req_workqueue);
hci_dev_lock(hdev);
hci_blacklist_clear(hdev);