linux-kernel - RE: [PATCH net v2 5/5] hv_netvsc: fix bonding devices check in netvsc_netdev

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Message-ID: <DM5PR03MB2538F9629FA09B6E3BE4FC5ECA120@DM5PR03MB2538.namprd03.prod.outlook.com>
Date:	Mon, 15 Aug 2016 15:54:55 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: RE: [PATCH net v2 5/5] hv_netvsc: fix bonding devices check in
 netvsc_netdev_event()



> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
> Sent: Monday, August 15, 2016 11:49 AM
> To: netdev@...r.kernel.org
> Cc: devel@...uxdriverproject.org; linux-kernel@...r.kernel.org; Haiyang
> Zhang <haiyangz@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>;
> Stephen Hemminger <stephen@...workplumber.org>
> Subject: [PATCH net v2 5/5] hv_netvsc: fix bonding devices check in
> netvsc_netdev_event()
> 
> Bonding driver sets IFF_BONDING on both master (the bonding device) and
> slave (the real NIC) devices and in netvsc_netdev_event() we want to skip
> master devices only. Currently, there is an uncertainty when a slave
> interface is removed: if bonding module comes first in netdev_chain it
> clears IFF_BONDING flag on the netdev and netvsc_netdev_event()
> correctly
> handles NETDEV_UNREGISTER event, but in case netvsc comes first on the
> chain it sees the device with IFF_BONDING still attached and skips it. As
> we still hold vf_netdev pointer to the device we crash on the next inject.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Thanks!

Acked-by: Haiyang Zhang <haiyangz@...rosoft.com>