Bluetooth: Fix usage of __hci_cmd_sync_status

[ Upstream commit 87be7b1 ]

__hci_cmd_sync_status shall only be used if hci_req_sync_lock is _not_
required which is not the case of hci_dev_cmd so it needs to use
hci_cmd_sync_status which uses hci_req_sync_lock internally.

Fixes: f1a8f40 ("Bluetooth: L2CAP: Fix deadlock")
Reported-by: Pauli Virtanen <[email protected]>
Signed-off-by: Luiz Augusto von Dentz <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Vudentz

net/bluetooth/hci_core.c

@@ -711,8 +711,8 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 
 	switch (cmd) {
 	case HCISETAUTH:
-		err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_AUTH_ENABLE,
-					    1, &dr.dev_opt, HCI_CMD_TIMEOUT);
+		err = hci_cmd_sync_status(hdev, HCI_OP_WRITE_AUTH_ENABLE,
+					  1, &dr.dev_opt, HCI_CMD_TIMEOUT);
 		break;
 
 	case HCISETENCRYPT:
@@ -723,23 +723,21 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 
 		if (!test_bit(HCI_AUTH, &hdev->flags)) {
 			/* Auth must be enabled first */
-			err = __hci_cmd_sync_status(hdev,
-						    HCI_OP_WRITE_AUTH_ENABLE,
-						    1, &dr.dev_opt,
-						    HCI_CMD_TIMEOUT);
+			err = hci_cmd_sync_status(hdev,
+						  HCI_OP_WRITE_AUTH_ENABLE,
+						  1, &dr.dev_opt,
+						  HCI_CMD_TIMEOUT);
 			if (err)
 				break;
 		}
 
-		err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_ENCRYPT_MODE,
-					    1, &dr.dev_opt,
-					    HCI_CMD_TIMEOUT);
+		err = hci_cmd_sync_status(hdev, HCI_OP_WRITE_ENCRYPT_MODE,
+					  1, &dr.dev_opt, HCI_CMD_TIMEOUT);
 		break;
 
 	case HCISETSCAN:
-		err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SCAN_ENABLE,
-					    1, &dr.dev_opt,
-					    HCI_CMD_TIMEOUT);
+		err = hci_cmd_sync_status(hdev, HCI_OP_WRITE_SCAN_ENABLE,
+					  1, &dr.dev_opt, HCI_CMD_TIMEOUT);
 
 		/* Ensure that the connectable and discoverable states
 		 * get correctly modified as this was a non-mgmt change.
@@ -751,9 +749,8 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 	case HCISETLINKPOL:
 		policy = cpu_to_le16(dr.dev_opt);
 
-		err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_DEF_LINK_POLICY,
-					    2, &policy,
-					    HCI_CMD_TIMEOUT);
+		err = hci_cmd_sync_status(hdev, HCI_OP_WRITE_DEF_LINK_POLICY,
+					  2, &policy, HCI_CMD_TIMEOUT);
 		break;
 
 	case HCISETLINKMODE: