netdev - Re: [PATCH 3/5] net/cpsw: don't rely on netif_running() to check which device is active

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Date:	Fri, 19 Apr 2013 17:10:46 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	Mugunthan V N <mugunthanvnm@...com>, netdev@...r.kernel.org,
	tglx@...utronix.de, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3/5] net/cpsw: don't rely on netif_running() to check
 which device is active

Hello.

On 18-04-2013 1:52, Sebastian Andrzej Siewior wrote:

> netif_running() reports false before even the ->ndo_stop() callback is
> called. That means if one executes "ifconfig down" and the system
> receives an interrupt before the interrupt source has been disabled we
> hang for always for two reasons:
> - we never disable the interrupt source because devices claim to be
>    already inactive (or non-present)
> - since the ISR always reports IRQ_HANDLED the line is never deactivated
>    because it looks like the ISR feels respsonsible.

> This patch introduces now the ->active field which is set/cleared in
> ndo_open / ndo_stop.

> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>   drivers/net/ethernet/ti/cpsw.c |   26 +++++++++++++++++---------
>   1 file changed, 17 insertions(+), 9 deletions(-)

> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 3b22a36..c32780d 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -341,6 +341,7 @@ struct cpsw_priv {
>   	int				host_port;
>   	struct clk			*clk;
>   	u8				mac_addr[ETH_ALEN];
> +	u8				active;

    *bool* seems to fit better here.

WBR, Sergei

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