linux-kernel - Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

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Message-ID: <47A76106.3000103@gandalf.sssup.it>
Date:	Mon, 04 Feb 2008 20:01:26 +0100
From:	michael <trimarchi@...dalf.sssup.it>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
CC:	Remy Bohmer <linux@...mer.net>, fabio@...dalf.sssup.it,
	Andrew Victor <linux@...im.org.za>,
	Chip Coldwell <coldwell@...hat.com>,
	Marc Pignat <marc.pignat@...s.ch>,
	David Brownell <david-b@...bell.net>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

Hi
> Haavard
>
> diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
> index 477950f..c61fcc3 100644
> --- a/drivers/serial/atmel_serial.c
> +++ b/drivers/serial/atmel_serial.c
> @@ -337,9 +337,12 @@ atmel_buffer_rx_char(struct uart_port *port, unsigned int status,
>  	struct circ_buf *ring = &atmel_port->rx_ring;
>  	struct atmel_uart_char *c;
>  
> -	if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))
> +	if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE)) {
> +		dev_err(port->dev, "RX ring buffer full, dropping data\n");
> +
>  		/* Buffer overflow, ignore char */
>  		return;
> +	}
>  
>  	c = &((struct atmel_uart_char *)ring->buf)[ring->head];
>  	c->status	= status;
>
>   

I have already tried that but I have never seen the buffer full. So 
tomorrow  I can do other
tests with the serial device. I think the the atmel_interrupt handler 
must check the
pass_counter before return IRQ_HANDLED.

Regards Michael


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