netdev - Re: [PATCH 13/16] c_can: flexcard: add ioctl to reset FIFO message object

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Date:	Mon, 09 Sep 2013 12:24:10 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Benedikt Spranger <b.spranger@...utronix.de>
CC:	netdev@...r.kernel.org,
	Alexander Frank <Alexander.Frank@...rspaecher.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Holger Dengler <dengler@...utronix.de>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Subject: Re: [PATCH 13/16] c_can: flexcard: add ioctl to reset FIFO message
 object

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The FlexCard FIFO reset implementation did not reset the FIFO message object.
> Since the FIFO configuration is done from userspace a function to reset the
> FIFO message object is needed. Add an ioctl to reset the FIFO message object
> from userspace.

Can you elaborate this a bit.

> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
>
> ---
>  drivers/net/can/c_can/c_can.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 51ca2a6..670a6b1 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -1447,7 +1447,21 @@ void free_c_can_dev(struct net_device *dev)
>  }
>  EXPORT_SYMBOL_GPL(free_c_can_dev);
>  
> +static int c_can_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
> +{
> +	switch (cmd) {
> +	case SIOCDEVPRIVATE:
> +		c_can_inval_msg_object(dev, 0, FC_TXFIFO_MO);
> +		break;

What happens if you call this ioctl on non flexcard HW?

> +	default:
> +		return -ENOIOCTLCMD;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct net_device_ops c_can_netdev_ops = {
> +	.ndo_do_ioctl = c_can_ioctl,
>  	.ndo_open = c_can_open,
>  	.ndo_stop = c_can_close,
>  	.ndo_start_xmit = c_can_start_xmit,
> 

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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