netdev - RE: [PATCH net,v4, 1/3] hv_netvsc: fix race of netvsc and VF register

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Date: Mon, 13 Nov 2023 02:47:44 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: Haiyang Zhang <haiyangz@...rosoft.com>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
CC: KY Srinivasan <kys@...rosoft.com>, "wei.liu@...nel.org"
	<wei.liu@...nel.org>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>
Subject: RE: [PATCH net,v4, 1/3] hv_netvsc: fix race of netvsc and VF
 register_netdevice

> From: LKML haiyangz <lkmlhyz@...rosoft.com> On Behalf Of Haiyang Zhang
> Sent: Friday, November 10, 2023 9:39 AM
> [...]
> 
> The rtnl lock also needs to be held before rndis_filter_device_add()
> which advertises nvsp_2_vsc_capability / sriov bit, and triggers
> VF NIC offering and registering. If VF NIC finished register_netdev()
> earlier it may cause name based config failure.
> 
> To fix this issue, move the call to rtnl_lock() before
> rndis_filter_device_add(), so VF will be registered later than netvsc
> / synthetic NIC, and gets a name numbered (ethX) after netvsc.
> 
> Cc: stable@...r.kernel.org
> Fixes: e04e7a7bbd4b ("hv_netvsc: Fix a deadlock by getting rtnl lock earlier in
> netvsc_probe()")
> Reported-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>

Reviewed-by: Dexuan Cui <decui@...rosoft.com>