netdev - Re: [net PATCH] xdp: obtain the mem_id mutex before trying to remove an entry.

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Message-ID: <20191204202818.GA16934@Iliass-MacBook-Pro.local>
Date:   Wed, 4 Dec 2019 12:28:18 -0800
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        netdev@...r.kernel.org, davem@...emloft.net, kernel-team@...com
Subject: Re: [net PATCH] xdp: obtain the mem_id mutex before trying to remove
 an entry.

On Wed, Dec 04, 2019 at 12:07:22PM +0200, Grygorii Strashko wrote:
> 
> 
> On 04/12/2019 10:32, Jesper Dangaard Brouer wrote:
> > On Tue, 3 Dec 2019 14:01:14 -0800
> > Jonathan Lemon <jonathan.lemon@...il.com> wrote:
> > 
> > > A lockdep splat was observed when trying to remove an xdp memory
> > > model from the table since the mutex was obtained when trying to
> > > remove the entry, but not before the table walk started:
> > > 
> > > Fix the splat by obtaining the lock before starting the table walk.
> > > 
> > > Fixes: c3f812cea0d7 ("page_pool: do not release pool until inflight == 0.")
> > > Reported-by: Grygorii Strashko <grygorii.strashko@...com>
> > > Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
> > 
> > Have you tested if this patch fix the problem reported by Grygorii?
> > 
> > Link: https://lore.kernel.org/netdev/c2de8927-7bca-612f-cdfd-e9112fee412a@ti.com
> > 
> > Grygorii can you test this?
> 
> Thanks.
> I do not see this trace any more and networking is working after if down/up
> 
> Tested-by: Grygorii Strashko <grygorii.strashko@...com>
> 
> 
> -- 
> Best regards,
> grygorii

Acked-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>