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Bluetooth: Remove unneeded commands for suspend

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During suspend, there are a few scan enable and set event filter
commands that don't need to be sent unless there are actual BR/EDR
devices capable of waking the system. Check the HCI_PSCAN bit before
writing scan enable and use a new dev flag, HCI_EVENT_FILTER_CONFIGURED
to control whether to clear the event filter.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Abhishek Pandit-Subedi 2021-03-03 08:34:04 -08:00 committed by Marcel Holtmann
parent 5cb08553f7
commit e5b0ad69c9
3 changed files with 55 additions and 17 deletions
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1
include/net/bluetooth/hci.h
View File

@ -320,6 +320,7 @@ enum {
HCI_BREDR_ENABLED,
HCI_LE_SCAN_INTERRUPTED,
HCI_WIDEBAND_SPEECH_ENABLED,
HCI_EVENT_FILTER_CONFIGURED,
HCI_DUT_MODE,
HCI_VENDOR_DIAG,

27
net/bluetooth/hci_event.c
View File

@ -395,6 +395,29 @@ static void hci_cc_write_scan_enable(struct hci_dev *hdev, struct sk_buff *skb)
hci_dev_unlock(hdev);
}
static void hci_cc_set_event_filter(struct hci_dev *hdev, struct sk_buff *skb)
{
__u8 status = *((__u8 *)skb->data);
struct hci_cp_set_event_filter *cp;
void *sent;
BT_DBG("%s status 0x%2.2x", hdev->name, status);
if (status)
return;
sent = hci_sent_cmd_data(hdev, HCI_OP_SET_EVENT_FLT);
if (!sent)
return;
cp = (struct hci_cp_set_event_filter *)sent;
if (cp->flt_type == HCI_FLT_CLEAR_ALL)
hci_dev_clear_flag(hdev, HCI_EVENT_FILTER_CONFIGURED);
else
hci_dev_set_flag(hdev, HCI_EVENT_FILTER_CONFIGURED);
}
static void hci_cc_read_class_of_dev(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_rp_read_class_of_dev *rp = (void *) skb->data;
@ -3328,6 +3351,10 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb,
hci_cc_write_scan_enable(hdev, skb);
break;
case HCI_OP_SET_EVENT_FLT:
hci_cc_set_event_filter(hdev, skb);
break;
case HCI_OP_READ_CLASS_OF_DEV:
hci_cc_read_class_of_dev(hdev, skb);
break;

44
net/bluetooth/hci_request.c
View File

@ -1131,14 +1131,14 @@ static void hci_req_clear_event_filter(struct hci_request *req)
{
struct hci_cp_set_event_filter f;
memset(&f, 0, sizeof(f));
f.flt_type = HCI_FLT_CLEAR_ALL;
hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &f);
if (!hci_dev_test_flag(req->hdev, HCI_BREDR_ENABLED))
return;
/* Update page scan state (since we may have modified it when setting
* the event filter).
*/
__hci_req_update_scan(req);
if (hci_dev_test_flag(req->hdev, HCI_EVENT_FILTER_CONFIGURED)) {
memset(&f, 0, sizeof(f));
f.flt_type = HCI_FLT_CLEAR_ALL;
hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &f);
}
}
static void hci_req_set_event_filter(struct hci_request *req)
@ -1147,6 +1147,10 @@ static void hci_req_set_event_filter(struct hci_request *req)
struct hci_cp_set_event_filter f;
struct hci_dev *hdev = req->hdev;
u8 scan = SCAN_DISABLED;
bool scanning = test_bit(HCI_PSCAN, &hdev->flags);
if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
return;
/* Always clear event filter when starting */
hci_req_clear_event_filter(req);
@ -1167,12 +1171,13 @@ static void hci_req_set_event_filter(struct hci_request *req)
scan = SCAN_PAGE;
}
if (scan)
if (scan && !scanning) {
set_bit(SUSPEND_SCAN_ENABLE, hdev->suspend_tasks);
else
hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
} else if (!scan && scanning) {
set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
}
}
static void cancel_adv_timeout(struct hci_dev *hdev)
@ -1315,9 +1320,14 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
hdev->advertising_paused = true;
hdev->advertising_old_state = old_state;
/* Disable page scan */
page_scan = SCAN_DISABLED;
hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &page_scan);
/* Disable page scan if enabled */
if (test_bit(HCI_PSCAN, &hdev->flags)) {
page_scan = SCAN_DISABLED;
hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1,
&page_scan);
set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
}
/* Disable LE passive scan if enabled */
if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
@ -1328,9 +1338,6 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
/* Disable advertisement filters */
hci_req_add_set_adv_filter_enable(&req, false);
/* Mark task needing completion */
set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
/* Prevent disconnects from causing scanning to be re-enabled */
hdev->scanning_paused = true;
@ -1364,7 +1371,10 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
hdev->suspended = false;
hdev->scanning_paused = false;
/* Clear any event filters and restore scan state */
hci_req_clear_event_filter(&req);
__hci_req_update_scan(&req);
/* Reset passive/background scanning to normal */
__hci_update_background_scan(&req);
/* Enable all of the advertisement filters */