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Bluetooth: hci_conn: Fix not waiting for HCI_EVT_LE_CIS_ESTABLISHED
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When submitting HCI_OP_LE_CREATE_CIS the code shall wait for
HCI_EVT_LE_CIS_ESTABLISHED thus enforcing the serialization of
HCI_OP_LE_CREATE_CIS as the Core spec does not allow to send them in
parallel:

  BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E page 2566:

  If the Host issues this command before all the HCI_LE_CIS_Established
  events from the previous use of the command have been generated, the
  Controller shall return the error code Command Disallowed (0x0C).

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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Vudentz committed Apr 24, 2023
1 parent c14516f commit c09b80b
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Showing 3 changed files with 68 additions and 57 deletions.
2 changes: 2 additions & 0 deletions include/net/bluetooth/hci_sync.h
Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,8 @@ int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason);

int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn);

int hci_le_create_cis_sync(struct hci_dev *hdev, struct hci_conn *conn);

int hci_le_remove_cig_sync(struct hci_dev *hdev, u8 handle);

int hci_le_terminate_big_sync(struct hci_dev *hdev, u8 handle, u8 reason);
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58 changes: 1 addition & 57 deletions net/bluetooth/hci_conn.c
Original file line number Diff line number Diff line change
Expand Up @@ -1932,63 +1932,7 @@ bool hci_iso_setup_path(struct hci_conn *conn)

static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
{
struct {
struct hci_cp_le_create_cis cp;
struct hci_cis cis[0x1f];
} cmd;
struct hci_conn *conn = data;
u8 cig;

memset(&cmd, 0, sizeof(cmd));
cmd.cis[0].acl_handle = cpu_to_le16(conn->parent->handle);
cmd.cis[0].cis_handle = cpu_to_le16(conn->handle);
cmd.cp.num_cis++;
cig = conn->iso_qos.ucast.cig;

hci_dev_lock(hdev);

rcu_read_lock();

list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
struct hci_cis *cis = &cmd.cis[cmd.cp.num_cis];

if (conn == data || conn->type != ISO_LINK ||
conn->state == BT_CONNECTED ||
conn->iso_qos.ucast.cig != cig)
continue;

/* Check if all CIS(s) belonging to a CIG are ready */
if (!conn->parent || conn->parent->state != BT_CONNECTED ||
conn->state != BT_CONNECT) {
cmd.cp.num_cis = 0;
break;
}

/* Group all CIS with state BT_CONNECT since the spec don't
* allow to send them individually:
*
* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
* page 2566:
*
* If the Host issues this command before all the
* HCI_LE_CIS_Established events from the previous use of the
* command have been generated, the Controller shall return the
* error code Command Disallowed (0x0C).
*/
cis->acl_handle = cpu_to_le16(conn->parent->handle);
cis->cis_handle = cpu_to_le16(conn->handle);
cmd.cp.num_cis++;
}

rcu_read_unlock();

hci_dev_unlock(hdev);

if (!cmd.cp.num_cis)
return 0;

return hci_send_cmd(hdev, HCI_OP_LE_CREATE_CIS, sizeof(cmd.cp) +
sizeof(cmd.cis[0]) * cmd.cp.num_cis, &cmd);
return hci_le_create_cis_sync(hdev, data);
}

int hci_le_create_cis(struct hci_conn *conn)
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65 changes: 65 additions & 0 deletions net/bluetooth/hci_sync.c
Original file line number Diff line number Diff line change
Expand Up @@ -6137,6 +6137,71 @@ int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn)
return err;
}

int hci_le_create_cis_sync(struct hci_dev *hdev, struct hci_conn *conn)
{
struct {
struct hci_cp_le_create_cis cp;
struct hci_cis cis[0x1f];
} cmd;
u8 cig;
struct hci_conn *hcon = conn;

memset(&cmd, 0, sizeof(cmd));
cmd.cis[0].acl_handle = cpu_to_le16(conn->parent->handle);
cmd.cis[0].cis_handle = cpu_to_le16(conn->handle);
cmd.cp.num_cis++;
cig = conn->iso_qos.ucast.cig;

hci_dev_lock(hdev);

rcu_read_lock();

list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
struct hci_cis *cis = &cmd.cis[cmd.cp.num_cis];

if (conn == hcon || conn->type != ISO_LINK ||
conn->state == BT_CONNECTED ||
conn->iso_qos.ucast.cig != cig)
continue;

/* Check if all CIS(s) belonging to a CIG are ready */
if (!conn->parent || conn->parent->state != BT_CONNECTED ||
conn->state != BT_CONNECT) {
cmd.cp.num_cis = 0;
break;
}

/* Group all CIS with state BT_CONNECT since the spec don't
* allow to send them individually:
*
* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
* page 2566:
*
* If the Host issues this command before all the
* HCI_LE_CIS_Established events from the previous use of the
* command have been generated, the Controller shall return the
* error code Command Disallowed (0x0C).
*/
cis->acl_handle = cpu_to_le16(conn->parent->handle);
cis->cis_handle = cpu_to_le16(conn->handle);
cmd.cp.num_cis++;
}

rcu_read_unlock();

hci_dev_unlock(hdev);

if (!cmd.cp.num_cis)
return 0;

/* Wait for HCI_LE_CIS_Established */
return __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_CREATE_CIS,
sizeof(cmd.cp) + sizeof(cmd.cis[0]) *
cmd.cp.num_cis, &cmd,
HCI_EVT_LE_CIS_ESTABLISHED,
conn->conn_timeout, NULL);
}

int hci_le_remove_cig_sync(struct hci_dev *hdev, u8 handle)
{
struct hci_cp_le_remove_cig cp;
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