linux-kernel - Re: [PATCH net-next 01/12] ptr_ring: keep consumer

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Message-ID: <839791ca-8b20-f351-4ba1-bc2a071e4a3d@gmail.com>
Date:   Thu, 25 Jan 2018 16:11:54 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next 01/12] ptr_ring: keep consumer_head valid at all
 times

On 01/25/2018 03:36 PM, Michael S. Tsirkin wrote:
> The comment near __ptr_ring_peek says:
> 
>  * If ring is never resized, and if the pointer is merely
>  * tested, there's no need to take the lock - see e.g.  __ptr_ring_empty.
> 
> but this was in fact never possible since consumer_head would sometimes
> point outside the ring. Refactor the code so that it's always
> pointing within a ring.
> 
> Fixes: c5ad119fb6c09 ("net: sched: pfifo_fast use skb_array")
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/linux/ptr_ring.h | 25 ++++++++++++++++---------
>  1 file changed, 16 insertions(+), 9 deletions(-)
> 

Thanks for fixing this up.

Acked-by: John Fastabend <john.fastabend@...il.com>