linux-kernel - Re: [PATCH 3/3] ipoctal: get carrier driver to avoid rmmod

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Date:	Wed, 03 Sep 2014 09:53:05 +0200
From:	Samuel Iglesias Gonsálvez 
	<siglesias@...lia.com>
To:	Federico Vaga <federico.vaga@...n.ch>
Cc:	Jens Taprogge <jens.taprogge@...rogge.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	industrypack-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ipoctal: get carrier driver to avoid rmmod


On Tue, 2014-09-02 at 17:31 +0200, Federico Vaga wrote:
> Signed-off-by: Federico Vaga <federico.vaga@...n.ch>
> ---
>  drivers/ipack/devices/ipoctal.c |   30 +++++++++++++++++++++++++++---
>  1 file changed, 27 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
> index e531379..035d544 100644
> --- a/drivers/ipack/devices/ipoctal.c
> +++ b/drivers/ipack/devices/ipoctal.c
> @@ -55,6 +55,12 @@ struct ipoctal {
>  	u8 __iomem			*int_space;
>  };
>  
> +static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
> +					      unsigned int index)
> +{
> +	return container_of(chan, struct ipoctal, channel[index]);
> +}
> +
>  static void ipoctal_reset_channel(struct ipoctal_channel *channel)
>  {
>  	iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
> @@ -82,12 +88,20 @@ static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
>  
>  static int ipoctal_open(struct tty_struct *tty, struct file *file)
>  {
> -	struct ipoctal_channel *channel;
> +	struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
> +	struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
> +	int err;
>  
> -	channel = dev_get_drvdata(tty->dev);
>  	tty->driver_data = channel;
>  
> -	return tty_port_open(&channel->tty_port, tty, file);
> +	if (!ipack_get_carrier(ipoctal->dev))
> +		return -EBUSY;
> +
> +	err = tty_port_open(&channel->tty_port, tty, file);
> +	if (err)
> +		ipack_put_carrier(ipoctal->dev);
> +
> +	return err;
>  }
>  
>  static void ipoctal_reset_stats(struct ipoctal_stats *stats)
> @@ -631,6 +645,15 @@ static void ipoctal_shutdown(struct tty_struct *tty)
>  	clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
>  }
>  
> +static void ipoctal_cleanup(struct tty_struct *tty)
> +{
> +	struct ipoctal_channel *channel = tty->driver_data;
> +	struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
> +
> +	/* release the carrier driver */
> +	ipack_put_carrier(ipoctal->dev);
> +}
> +
>  static const struct tty_operations ipoctal_fops = {
>  	.ioctl =		NULL,
>  	.open =			ipoctal_open,
> @@ -642,6 +665,7 @@ static const struct tty_operations ipoctal_fops = {
>  	.get_icount =		ipoctal_get_icount,
>  	.hangup =		ipoctal_hangup,
>  	.shutdown =		ipoctal_shutdown,
> +	.cleanup =              ipoctal_cleanup,
>  };
>  
>  static int ipoctal_probe(struct ipack_device *dev)

Acked-by: Samuel Iglesias Gonsalvez <siglesias@...lia.com>

Greg, Can you this series through your char-misc tree?

Sam



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