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Date: Thu, 5 May 2016 16:22:38 +0100
From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Amitkumar Karwar <akarwar@marvell.com>
Cc: <linux-bluetooth@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Ganapathi Bhat <gbhat@marvell.com>
Subject: Re: [PATCH v10 3/3] Bluetooth: hci_uart: Support firmware download
 for Marvell
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> +/* Send ACK/NAK to the device */
> +static void mrvl_send_ack(struct hci_uart *hu, unsigned char ack)
> +{
> +	struct tty_struct *tty = hu->tty;
> +
> +	tty->ops->write(tty, &ack, sizeof(ack));
> +}

You don't know if the device has a write method, and it should be locked.
This should go via your ldisc not directly.

Alan