linux-kernel - Re: [PATCH] serial: tegra: add serial driver

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Date:	Mon, 17 Dec 2012 18:23:43 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	<alan@...ux.intel.com>, <gregkh@...uxfoundation.org>,
	<jslaby@...e.cz>, <grant.likely@...retlab.ca>,
	<rob.herring@...xeda.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<swarren@...dotorg.org>
Subject: Re: [PATCH] serial: tegra: add serial driver



> +
> +static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup, int count)
> +{
> +	int copied;
> +
> +	tup->uport.icount.rx += count;
> +	dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys,
> +				TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
> +	copied = tty_insert_flip_string(tup->uport.state->port.tty,

Reference needed and port.tty can go to NULL
(good rule of thumb - any use of port.tty directly is probably wrong)

‎
> +	tty_flip_buffer_push(u->state->port.tty);

Ditto (and elsewhere)

> +	if ((c_cflag & PARENB) == PARENB) {
> +		symb_bit++;
> +		if ((c_cflag & CMSPAR) == CMSPAR) {
> +			dev_err(tup->uport.dev, "Space parity not supported\n");
> +			return;

No - this is out of spec and lets user tasks spam the log. Just clear the
flag if not supported.


> +	/* Baud rate. */
> +	baud = uart_get_baud_rate(u, termios, oldtermios, 200, 4000000);
> +	spin_unlock_irqrestore(&u->lock, flags);
> +	tegra_set_baudrate(tup, baud);
> +	spin_lock_irqsave(&u->lock, flags);

I think you need to use the helpers to put the actual baud it got into the
termios if not B0 - see 8250.c ?

Alan
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