netdev - Re: [PATCH 5/7] can: clear ctrlmode when close candev

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Message-ID: <5457AD40.7020606@pengutronix.de>
Date:	Mon, 03 Nov 2014 17:28:48 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Dong Aisheng <b29396@...escale.com>, linux-can@...r.kernel.org
CC:	wg@...ndegger.com, varkabhadram@...il.com, netdev@...r.kernel.org,
	socketcan@...tkopp.net, linux-arm-kernel@...ts.infradead.org,
	Oliver Hartkopp <socketcan@...tkopp.net>
Subject: Re: [PATCH 5/7] can: clear ctrlmode when close candev

On 10/29/2014 11:45 AM, Dong Aisheng wrote:
> Currently priv->ctrlmode is not cleared when close_candev, so next time
> the driver will still use this value to set controller even user
> does not set any ctrl mode.
> e.g.
> Step 1. ip link set can0 up type can0 bitrate 1000000 loopback on
> Controller will be in loopback mode
> Step 2. ip link set can0 down
> Step 3. ip link set can0 up type can0 bitrate 1000000
> Controller will still be set to loopback mode in driver due to saved
> priv->ctrlmode.
> 
> This patch clears priv->ctrlmode when the CAN interface is closed,
> and set it to correct mode according to next user setting.

Oliver, what do you think of this patch? It will introduce a subtle
change to the userspace.

Marc

> Signed-off-by: Dong Aisheng <b29396@...escale.com>
> ---
>  drivers/net/can/dev.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
> index 02492d2..1fce485 100644
> --- a/drivers/net/can/dev.c
> +++ b/drivers/net/can/dev.c
> @@ -671,6 +671,7 @@ void close_candev(struct net_device *dev)
>  
>  	del_timer_sync(&priv->restart_timer);
>  	can_flush_echo_skb(dev);
> +	priv->ctrlmode = 0;
>  }
>  EXPORT_SYMBOL_GPL(close_candev);
>  
> 


-- 
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