6.11-stable review patch. If anyone has any objections, please let me know.
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From: Iulia Tanasescu iulia.tanasescu@nxp.com
[ Upstream commit 07a9342b94a91b306ed1cf6aa8254aea210764c9 ]
Before issuing the LE BIG Create Sync command, an available BIG handle is chosen by iterating through the conn_hash list and finding the first unused value.
If a BIG is terminated, the associated hcons are removed from the list and the LE BIG Terminate Sync command is sent via hci_sync queue. However, a new LE BIG Create sync command might be issued via hci_send_cmd, before the previous BIG sync was terminated. This can cause the same BIG handle to be reused and the LE BIG Create Sync to fail with Command Disallowed.
< HCI Command: LE Broadcast Isochronous Group Create Sync (0x08|0x006b) BIG Handle: 0x00 BIG Sync Handle: 0x0002 Encryption: Unencrypted (0x00) Broadcast Code[16]: 00000000000000000000000000000000 Maximum Number Subevents: 0x00 Timeout: 20000 ms (0x07d0) Number of BIS: 1 BIS ID: 0x01
HCI Event: Command Status (0x0f) plen 4
LE Broadcast Isochronous Group Create Sync (0x08|0x006b) ncmd 1 Status: Command Disallowed (0x0c) < HCI Command: LE Broadcast Isochronous Group Terminate Sync (0x08|0x006c) BIG Handle: 0x00
This commit fixes the ordering of the LE BIG Create Sync/LE BIG Terminate Sync commands, to make sure that either the previous BIG sync is terminated before reusing the handle, or that a new handle is chosen for a new sync.
Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS connections") Signed-off-by: Iulia Tanasescu iulia.tanasescu@nxp.com Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/bluetooth/hci_conn.c | 17 ++++++++++++++++- net/bluetooth/iso.c | 9 +++++++++ 2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index b2bb14055a759..cc3253e9d41d0 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -2189,7 +2189,15 @@ static bool hci_conn_check_create_big_sync(struct hci_conn *conn) return true; }
-int hci_le_big_create_sync_pending(struct hci_dev *hdev) +static void big_create_sync_complete(struct hci_dev *hdev, void *data, int err) +{ + bt_dev_dbg(hdev, ""); + + if (err) + bt_dev_err(hdev, "Unable to create BIG sync: %d", err); +} + +static int big_create_sync(struct hci_dev *hdev, void *data) { DEFINE_FLEX(struct hci_cp_le_big_create_sync, pdu, bis, num_bis, 0x11); struct hci_conn *conn; @@ -2246,6 +2254,13 @@ int hci_le_big_create_sync_pending(struct hci_dev *hdev) struct_size(pdu, bis, pdu->num_bis), pdu); }
+int hci_le_big_create_sync_pending(struct hci_dev *hdev) +{ + /* Queue big_create_sync */ + return hci_cmd_sync_queue_once(hdev, big_create_sync, + NULL, big_create_sync_complete); +} + int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon, struct bt_iso_qos *qos, __u16 sync_handle, __u8 num_bis, __u8 bis[]) diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c index 463c61712b249..5e2d9758bd3c1 100644 --- a/net/bluetooth/iso.c +++ b/net/bluetooth/iso.c @@ -1392,6 +1392,13 @@ static void iso_conn_big_sync(struct sock *sk) if (!hdev) return;
+ /* hci_le_big_create_sync requires hdev lock to be held, since + * it enqueues the HCI LE BIG Create Sync command via + * hci_cmd_sync_queue_once, which checks hdev flags that might + * change. + */ + hci_dev_lock(hdev); + if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) { err = hci_le_big_create_sync(hdev, iso_pi(sk)->conn->hcon, &iso_pi(sk)->qos, @@ -1402,6 +1409,8 @@ static void iso_conn_big_sync(struct sock *sk) bt_dev_err(hdev, "hci_le_big_create_sync: %d", err); } + + hci_dev_unlock(hdev); }
static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,