Bluetooth: hci_core: Fix triggering cmd_timer for HCI_OP_NOP

HCI_OP_NOP means no command was actually sent so there is no point in
triggering cmd_timer which may cause a hdev->reset in the process since
it is assumed that the controller is stuck processing a command.

Fixes: e2d471b7806b ("Bluetooth: ISO: Fix not using SID from adv report")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 3418d7b964a1c73c8ebc1a0e809a0fa62bfa5d05..1920e3d62bdaa1ea4cc68c89688bcf32bb46f3c6 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -4121,7 +4121,7 @@ static void hci_rx_work(struct work_struct *work)
        }
 }
 
-static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
+static int hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
 {
        int err;
 
@@ -4133,16 +4133,19 @@ static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
        if (!hdev->sent_cmd) {
                skb_queue_head(&hdev->cmd_q, skb);
                queue_work(hdev->workqueue, &hdev->cmd_work);
-               return;
+               return -EINVAL;
        }
 
        if (hci_skb_opcode(skb) != HCI_OP_NOP) {
                err = hci_send_frame(hdev, skb);
                if (err < 0) {
                        hci_cmd_sync_cancel_sync(hdev, -err);
-                       return;
+                       return err;
                }
                atomic_dec(&hdev->cmd_cnt);
+       } else {
+               err = -ENODATA;
+               kfree_skb(skb);
        }
 
        if (hdev->req_status == HCI_REQ_PEND &&
@@ -4150,12 +4153,15 @@ static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
                kfree_skb(hdev->req_skb);
                hdev->req_skb = skb_clone(hdev->sent_cmd, GFP_KERNEL);
        }
+
+       return err;
 }
 
 static void hci_cmd_work(struct work_struct *work)
 {
        struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_work);
        struct sk_buff *skb;
+       int err;
 
        BT_DBG("%s cmd_cnt %d cmd queued %d", hdev->name,
               atomic_read(&hdev->cmd_cnt), skb_queue_len(&hdev->cmd_q));
@@ -4166,7 +4172,9 @@ static void hci_cmd_work(struct work_struct *work)
                if (!skb)
                        return;
 
-               hci_send_cmd_sync(hdev, skb);
+               err = hci_send_cmd_sync(hdev, skb);
+               if (err)
+                       return;
 
                rcu_read_lock();
                if (test_bit(HCI_RESET, &hdev->flags) ||