linux-kernel - Re: [PATCH] xen/netback: avoid race in xenvif_rx_ring_slots

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Message-ID: <20210204175628.7904d1da@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 4 Feb 2021 17:56:28 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jürgen Groß <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Wei Liu <wei.liu@...nel.org>,
        Paul Durrant <paul@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Igor Druzhinin <igor.druzhinin@...rix.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] xen/netback: avoid race in
 xenvif_rx_ring_slots_available()

On Thu, 4 Feb 2021 06:32:32 +0100 Jürgen Groß wrote:
> On 04.02.21 00:48, Jakub Kicinski wrote:
> > On Tue,  2 Feb 2021 08:09:38 +0100 Juergen Gross wrote:  
> >> Since commit 23025393dbeb3b8b3 ("xen/netback: use lateeoi irq binding")
> >> xenvif_rx_ring_slots_available() is no longer called only from the rx
> >> queue kernel thread, so it needs to access the rx queue with the
> >> associated queue held.
> >>
> >> Reported-by: Igor Druzhinin <igor.druzhinin@...rix.com>
> >> Fixes: 23025393dbeb3b8b3 ("xen/netback: use lateeoi irq binding")
> >> Cc: stable@...r.kernel.org
> >> Signed-off-by: Juergen Gross <jgross@...e.com>  
> > 
> > Should we route this change via networking trees? I see the bug did not
> > go through networking :)
> 
> I'm fine with either networking or the Xen tree. It should be included
> in 5.11, though. So if you are willing to take it, please do so.

All right, applied to net, it'll most likely hit Linus's tree on Tue.

Thanks!