linux-kernel - RE: [PATCH net] hv_netvsc: Fix a warning of suspicious RCU usage

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Message-ID: <PU1P153MB0169F8B31B25E995742CCB0BBFD40@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Wed, 7 Aug 2019 06:56:12 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>
Subject: RE: [PATCH net] hv_netvsc: Fix a warning of suspicious RCU usage

> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Sent: Tuesday, August 6, 2019 12:13 PM
> To: Dexuan Cui <decui@...rosoft.com>
> 
> On Tue, 6 Aug 2019 05:17:44 +0000, Dexuan Cui wrote:
> > This fixes a warning of "suspicious rcu_dereference_check() usage"
> > when nload runs.
> >
> > Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> > Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> 
> Minor change in behaviour would perhaps be worth acknowledging in the
> commit message (since you check ndev for NULL later now), and a Fixes
> tag would be good.
> 
> But the looks pretty straightforward and correct!

Hi,
Yeah, it looks the minor behavior change doesn't matter, because IMO the 
'nvdev' can only be NULL when the NIC is being removed, or the MTU is
being changed, etc.

The Fixes tag is:
Fixes: 776e726bfb34 ("netvsc: fix RCU warning in get_stats")

If I should send a v2, please let me know.

Thanks,
-- Dexuan