linux-kernel - RE: [PATCH net,v4, 2/3] hv_netvsc: Fix race of register_netdevice

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Message-ID: <SA1PR21MB13353EB2FAB9ECF0F135BF19BFB3A@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Mon, 13 Nov 2023 02:55:58 +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, 2/3] hv_netvsc: Fix race of
 register_netdevice_notifier and VF register

> From: LKML haiyangz <lkmlhyz@...rosoft.com> On Behalf Of Haiyang Zhang
> Sent: Friday, November 10, 2023 9:39 AM
> [...]
> If VF NIC is registered earlier, NETDEV_REGISTER event is replayed,
> but NETDEV_POST_INIT is not.
> 
> Move register_netdevice_notifier() earlier, so the call back
> function is set before probing.
> 
> 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>

It's better to post a new version that follows Simon Horman's suggestion,
i.e., use a more idiomatic form for the error path.