[v2,1/4] Bluetooth: ISO: use hci_sync for setting CIG parameters

Commit Message

Pauli Virtanen June 1, 2023, 6:34 a.m. UTC

When reconfiguring CIG after disconnection of the last CIS, LE Remove
CIG shall be sent before LE Set CIG Parameters.  Otherwise, it fails
because CIG is in the inactive state and not configurable (Core v5.3
Vol 6 Part B Sec. 4.5.14.3). This ordering is currently wrong under
suitable timing conditions, because LE Remove CIG is sent via the
hci_sync queue and may be delayed, but Set CIG Parameters is via
hci_send_cmd.

Make the ordering well-defined by sending also Set CIG Parameters via
hci_sync.

Fixes: 26afbd826ee3 ("Bluetooth: Add initial implementation of CIS connections")
Signed-off-by: Pauli Virtanen <[e-mail]>
---

Notes:
    v2: rebased, no changes

 net/bluetooth/hci_conn.c | 47 +++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 8 deletions(-)

Comments

[e-mail] June 1, 2023, 7:36 a.m. UTC | #1

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=752943

---Test result---

Test Summary:
CheckPatch                    PASS      3.68 seconds
GitLint                       PASS      1.00 seconds
SubjectPrefix                 PASS      0.28 seconds
BuildKernel                   PASS      38.01 seconds
CheckAllWarning               PASS      42.14 seconds
CheckSparse                   WARNING   47.48 seconds
CheckSmatch                   WARNING   129.23 seconds
BuildKernel32                 PASS      37.72 seconds
TestRunnerSetup               PASS      528.41 seconds
TestRunner_l2cap-tester       PASS      19.39 seconds
TestRunner_iso-tester         PASS      27.00 seconds
TestRunner_bnep-tester        PASS      6.56 seconds
TestRunner_mgmt-tester        PASS      132.55 seconds
TestRunner_rfcomm-tester      PASS      10.70 seconds
TestRunner_sco-tester         PASS      9.77 seconds
TestRunner_ioctl-tester       PASS      11.76 seconds
TestRunner_mesh-tester        PASS      8.46 seconds
TestRunner_smp-tester         PASS      9.57 seconds
TestRunner_userchan-tester    PASS      6.95 seconds
IncrementalBuild              PASS      81.16 seconds

Details
##############################
Test: CheckSparse - WARNING
Desc: Run sparse tool with linux kernel
Output:
net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):
##############################
Test: CheckSmatch - WARNING
Desc: Run smatch tool with source
Output:
net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):


---
Regards,
Linux Bluetooth

Patch

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 795b2daa5bac..f45476deca82 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -775,6 +775,11 @@  static void le_conn_timeout(struct work_struct *work)
 	hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 }
 
+struct iso_cig_params {
+	struct hci_cp_le_set_cig_params cp;
+	struct hci_cis_params cis[0x1f];
+};
+
 struct iso_list_data {
 	union {
 		u8  cig;
@@ -786,10 +791,7 @@  struct iso_list_data {
 		u16 sync_handle;
 	};
 	int count;
-	struct {
-		struct hci_cp_le_set_cig_params cp;
-		struct hci_cis_params cis[0x11];
-	} pdu;
+	struct iso_cig_params pdu;
 	bool big_term;
 };
 
@@ -1783,10 +1785,33 @@  static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
 	return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
 }
 
+static void set_cig_params_complete(struct hci_dev *hdev, void *data, int err)
+{
+	struct iso_cig_params *pdu = data;
+
+	bt_dev_dbg(hdev, "");
+
+	if (err)
+		bt_dev_err(hdev, "Unable to set CIG parameters: %d", err);
+
+	kfree(pdu);
+}
+
+static int set_cig_params_sync(struct hci_dev *hdev, void *data)
+{
+	struct iso_cig_params *pdu = data;
+	u32 plen;
+
+	plen = sizeof(pdu->cp) + pdu->cp.num_cis * sizeof(pdu->cis[0]);
+	return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS, plen, pdu,
+				     HCI_CMD_TIMEOUT);
+}
+
 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
 {
 	struct hci_dev *hdev = conn->hdev;
 	struct iso_list_data data;
+	struct iso_cig_params *pdu;
 
 	memset(&data, 0, sizeof(data));
 
@@ -1856,12 +1881,18 @@  static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
 	if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET || !data.pdu.cp.num_cis)
 		return false;
 
-	if (hci_send_cmd(hdev, HCI_OP_LE_SET_CIG_PARAMS,
-			 sizeof(data.pdu.cp) +
-			 (data.pdu.cp.num_cis * sizeof(*data.pdu.cis)),
-			 &data.pdu) < 0)
+	pdu = kzalloc(sizeof(*pdu), GFP_KERNEL);
+	if (!pdu)
 		return false;
 
+	memcpy(pdu, &data.pdu, sizeof(*pdu));
+
+	if (hci_cmd_sync_queue(hdev, set_cig_params_sync, pdu,
+			       set_cig_params_complete) < 0) {
+		kfree(pdu);
+		return false;
+	}
+
 	return true;
 }