linux-kernel - Re: [PATCH v2] hv_netvsc: Fix net device attach on older Windows hosts

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Message-ID: <20180509080714.1c7467b2@xeon-e3>
Date:   Wed, 9 May 2018 08:07:14 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Mohammed Gamal <mgamal@...hat.com>
Cc:     netdev@...r.kernel.org, sthemmin@...rosoft.com,
        haiyangz@...rosoft.com, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, vkuznets@...hat.com
Subject: Re: [PATCH v2] hv_netvsc: Fix net device attach on older Windows
 hosts

On Wed,  9 May 2018 10:17:34 +0200
Mohammed Gamal <mgamal@...hat.com> wrote:

> On older windows hosts the net_device instance is returned to
> the caller of rndis_filter_device_add() without having the presence
> bit set first. This would cause any subsequent calls to network device
> operations (e.g. MTU change, channel change) to fail after the device
> is detached once, returning -ENODEV.
> 
> Instead of returning the device instabce, we take the exit path where
> we call netif_device_attach()
> 
> Fixes: 7b2ee50c0cd5 ("hv_netvsc: common detach logic")
> 
> Signed-off-by: Mohammed Gamal <mgamal@...hat.com>

The standard for patch submission is no blank lines between Fixes
and Signed-off-by to make it easier for bots.

> ---
>  drivers/net/hyperv/rndis_filter.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
> index 6b127be..e7ca5b5 100644
> --- a/drivers/net/hyperv/rndis_filter.c
> +++ b/drivers/net/hyperv/rndis_filter.c
> @@ -1288,7 +1288,7 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
>  		   rndis_device->link_state ? "down" : "up");
>  
>  	if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
> -		return net_device;
> +		goto out;
>  
>  	rndis_filter_query_link_speed(rndis_device, net_device);
>  


Reviewed-by: Stephen Hemminger <sthemmin@...rosoft.com>