Bluetooth: btnxpuart: Fix driver sending truncated data

JIRA: https://issues.redhat.com/browse/RHEL-74483

commit 8023dd2
Author: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
Date:   Fri Dec 20 18:32:52 2024 +0530

    Bluetooth: btnxpuart: Fix driver sending truncated data

    This fixes the apparent controller hang issue seen during stress test
    where the host sends a truncated payload, followed by HCI commands. The
    controller treats these HCI commands as a part of previously truncated
    payload, leading to command timeouts.

    Adding a serdev_device_wait_until_sent() call after
    serdev_device_write_buf() fixed the issue.

    Fixes: 689ca16 ("Bluetooth: NXP: Add protocol support for NXP Bluetooth chipsets")
    Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
    Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Signed-off-by: Bastien Nocera <bnocera@redhat.com>

Author: Bastien Nocera

drivers/bluetooth/btnxpuart.c

@@ -1381,6 +1381,7 @@ static void btnxpuart_tx_work(struct work_struct *work)
 
 	while ((skb = nxp_dequeue(nxpdev))) {
 		len = serdev_device_write_buf(serdev, skb->data, skb->len);
+		serdev_device_wait_until_sent(serdev, 0);
 		hdev->stat.byte_tx += len;
 
 		skb_pull(skb, len);