linux-kernel - Re: [PATCH] max3100 driver

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Message-ID: <47663726.3010508@gmail.com>
Date:	Mon, 17 Dec 2007 09:45:26 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	chripell@...il.com
CC:	linux-kernel@...r.kernel.org,
	Christian Pellegrin <chripell@...e.org>
Subject: Re: [PATCH] max3100 driver

On 12/17/2007 09:17 AM, chripell@...il.com wrote:
> This patch adds support for the MAX3100 SPI UART.
> 
> Generated on  20071217  against v2.6.23
> 
> Signed-off-by: Christian Pellegrin <chripell@...e.org>
> ---
>  drivers/serial/Kconfig         |    7 +
>  drivers/serial/Makefile        |    1 +
>  drivers/serial/max3100.c       |  956 ++++++++++++++++++++++++++++++++++++++++
>  include/linux/serial_max3100.h |   25 +
>  4 files changed, 989 insertions(+), 0 deletions(-)
> 
[...]
> diff --git a/drivers/serial/max3100.c b/drivers/serial/max3100.c
> new file mode 100644
> index 0000000..d07936d
> --- /dev/null
> +++ b/drivers/serial/max3100.c
[...]
> +static int __devexit max3100_remove(struct spi_device *spi)
> +{
> +	int i;
> +
> +	i = 0;
> +
> +	for (i = 0; i < MAX_MAX3100; i++)
> +		if (max3100s[i] && max3100s[i]->ref_count > 0)
> +			return -EBUSY;
> +
> +	for (i = 0; i < MAX_MAX3100; i++)
> +		if (max3100s[i]) {
> +			tty_unregister_device(serial_driver, i);
> +			kfree(max3100s[i]);
> +			max3100s[i] = NULL;
> +		}
> +
> +	if (serial_driver)
> +		tty_unregister_driver(serial_driver);

You probably wanted to unregister it after _all_ cards are removed, not after
each...

> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int max3100_suspend(struct spi_device *spi, pm_message_t state)
> +{
> +	struct max3100_port_s *s = dev_get_drvdata(&spi->dev);
> +	u16 tx, rx;
> +
> +	tx = MAX3100_WC | MAX3100_SHDN;
> +	max3100_sr(s, tx, &rx, 0);

Also you should synchronize_irq() after stopping them here.

> +	return 0;
> +}

regards,
-- 
Jiri Slaby (jirislaby@...il.com)
Faculty of Informatics, Masaryk University
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