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

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Message-ID: <20210203154800.4c6959d6@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 3 Feb 2021 15:48:00 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Juergen 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 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 :)